GeoFossils Adamite specimen 182 in daylight, showing pale yellow to clear crystals across a reddish-brown mineral matrix.
GeoFossils Adamite specimen 182 under Mid Wave UV, showing strong green fluorescence across crystal-rich areas of the brown matrix
GeoFossils Adamite specimen 182 shown in a split comparison, with natural daylight on one half and green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 183 in daylight, with dense pale green-grey crystalline coverage on a rusty orange-brown matrix.
GeoFossils Adamite specimen 183 under Mid Wave UV, displaying intense green fluorescence across the broad crystal-covered surface.
GeoFossils Adamite specimen 183 shown in a split comparison, with natural daylight on one half and green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 184 in daylight, showing a dark reddish-brown matrix with small green crystals visible within a cavity
GeoFossils Adamite specimen 184 under Mid Wave UV, with concentrated bright green fluorescence inside the central cavity.
GeoFossils Adamite specimen 184 shown in a split comparison, with natural daylight on one half and localized green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 185 in daylight, an elongated reddish-brown specimen with clustered crystals across the surface.
GeoFossils Adamite specimen 185 under Mid Wave UV, showing concentrated green fluorescence among crystals near the centre-right.
GeoFossils Adamite specimen 185 shown in a split comparison, with natural daylight on one half and green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 186 in daylight, showing pale green to clear crystals within an orange and brown mineral matrix.
GeoFossils Adamite specimen 186 under Mid Wave UV, displaying bright green fluorescence across several central crystal clusters.
GeoFossils Adamite specimen 186 shown in a split comparison, with natural daylight on one half and bright green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 187 in daylight, featuring pale cream crystalline growth over a brown and rust-coloured matrix.
GeoFossils Adamite specimen 187 under Mid Wave UV, with broad green fluorescence across the crystal-rich right side of the specimen
GeoFossils Adamite specimen 187 shown in a split comparison, with natural daylight on one half and broad green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 188 in daylight, showing a predominantly rust-red matrix with small yellow-green crystal areas.
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
GeoFossils Adamite specimen 189 in daylight, with yellow-green crystals concentrated on one side of a rough orange-brown matrix.
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
GeoFossils Adamite specimen 190 in daylight, showing a rugged brown matrix with a small pale green crystalline cluster in a cavity.
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
GeoFossils Adamite specimen 191 in daylight, showing greenish crystals set within a rusty orange and dark brown mineral matrix.
GeoFossils Adamite specimen 191 under Mid Wave UV, displaying green fluorescence across the visible crystal clusters and cavity.
GeoFossils Adamite specimen 191 shown in a split comparison, with natural daylight on one half and green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 192 in daylight, an elongated reddish-brown matrix with scattered green crystalline growth.
GeoFossils Adamite specimen 192 under Mid Wave UV, showing green fluorescence across scattered crystal clusters on the elongated matrix.
GeoFossils Adamite specimen 193 in daylight, with numerous pale green crystals distributed across a low reddish-brown matrix.
GeoFossils Adamite specimen 193 under Mid Wave UV, displaying green fluorescence across multiple crystal clusters over the brown matrix.
GeoFossils Adamite specimen 193 shown in a split comparison, with natural daylight on one half and green fluorescence across multiple crystal clusters under Mid Wave UV on the other.
GeoFossils Adamite specimen 194 in daylight, showing a large yellow-green crystal-lined cavity within an orange-brown matrix.
GeoFossils Adamite specimen 194 under Mid Wave UV, with subtle fluorescence visible around the crystal-lined cavity and surrounding mineral areas.
GeoFossils Adamite specimen 194 shown in a split comparison, with natural daylight on one half and subtle Mid Wave UV fluorescence around the crystal-lined cavity on the other.
GeoFossils Adamite specimen 195 in daylight, showing scattered yellow-green crystals across a rugged brown and orange mineral matrix.
GeoFossils Adamite specimen 195 under Mid Wave UV, displaying small areas of green fluorescence among crystals across the rough matrix.
GeoFossils Adamite specimen 195 shown in a split comparison, with natural daylight on one half and small green fluorescent areas under Mid Wave UV on the other.
GeoFossils Adamite specimen 196 in daylight, showing a rusty orange-brown matrix with a dark crystal-lined cavity on the lower right.
GeoFossils Adamite specimen 196 under Mid Wave UV, with strong green fluorescence concentrated within the lower-right crystal cavity.
GeoFossils Adamite specimen 196 shown in a split comparison, with natural daylight on one half and strong green fluorescence within the lower-right cavity under Mid Wave UV on the other.
GeoFossils Adamite specimen 197 in daylight, with a dense reddish-brown botryoidal surface and a small greenish crystal cluster near the top.
GeoFossils Adamite specimen 197 under Mid Wave UV, showing localized green fluorescence from the small crystal cluster near the top.
GeoFossils Adamite specimen 197 shown in a split comparison, with natural daylight on one half and localized green fluorescence near the upper crystal cluster under Mid Wave UV on the other.
GeoFossils Adamite specimen 198 in daylight, showing a tall brown matrix with pale crystalline growth through a central cavity and ledge.
GeoFossils Adamite specimen 198 under Mid Wave UV, displaying green fluorescence along the central crystal-bearing seam and lower cluster.
GeoFossils Adamite specimen 198 shown in a split comparison, with natural daylight on one half and green fluorescence along the central crystal-bearing seam under Mid Wave UV on the other.
GeoFossils Adamite specimen 182 in daylight, showing pale yellow to clear crystals across a reddish-brown mineral matrix.
GeoFossils Adamite specimen 182 under Mid Wave UV, showing strong green fluorescence across crystal-rich areas of the brown matrix
GeoFossils Adamite specimen 182 shown in a split comparison, with natural daylight on one half and green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 183 in daylight, with dense pale green-grey crystalline coverage on a rusty orange-brown matrix.
GeoFossils Adamite specimen 183 under Mid Wave UV, displaying intense green fluorescence across the broad crystal-covered surface.
GeoFossils Adamite specimen 183 shown in a split comparison, with natural daylight on one half and green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 184 in daylight, showing a dark reddish-brown matrix with small green crystals visible within a cavity
GeoFossils Adamite specimen 184 under Mid Wave UV, with concentrated bright green fluorescence inside the central cavity.
GeoFossils Adamite specimen 184 shown in a split comparison, with natural daylight on one half and localized green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 185 in daylight, an elongated reddish-brown specimen with clustered crystals across the surface.
GeoFossils Adamite specimen 185 under Mid Wave UV, showing concentrated green fluorescence among crystals near the centre-right.
GeoFossils Adamite specimen 185 shown in a split comparison, with natural daylight on one half and green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 186 in daylight, showing pale green to clear crystals within an orange and brown mineral matrix.
GeoFossils Adamite specimen 186 under Mid Wave UV, displaying bright green fluorescence across several central crystal clusters.
GeoFossils Adamite specimen 186 shown in a split comparison, with natural daylight on one half and bright green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 187 in daylight, featuring pale cream crystalline growth over a brown and rust-coloured matrix.
GeoFossils Adamite specimen 187 under Mid Wave UV, with broad green fluorescence across the crystal-rich right side of the specimen
GeoFossils Adamite specimen 187 shown in a split comparison, with natural daylight on one half and broad green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 188 in daylight, showing a predominantly rust-red matrix with small yellow-green crystal areas.
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
GeoFossils Adamite specimen 189 in daylight, with yellow-green crystals concentrated on one side of a rough orange-brown matrix.
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
GeoFossils Adamite specimen 190 in daylight, showing a rugged brown matrix with a small pale green crystalline cluster in a cavity.
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
Adamite Fluorescent Mineral Specimen – Ojuela Mine, Mexico
GeoFossils Adamite specimen 191 in daylight, showing greenish crystals set within a rusty orange and dark brown mineral matrix.
GeoFossils Adamite specimen 191 under Mid Wave UV, displaying green fluorescence across the visible crystal clusters and cavity.
GeoFossils Adamite specimen 191 shown in a split comparison, with natural daylight on one half and green fluorescence under Mid Wave UV on the other.
GeoFossils Adamite specimen 192 in daylight, an elongated reddish-brown matrix with scattered green crystalline growth.
GeoFossils Adamite specimen 192 under Mid Wave UV, showing green fluorescence across scattered crystal clusters on the elongated matrix.
GeoFossils Adamite specimen 193 in daylight, with numerous pale green crystals distributed across a low reddish-brown matrix.
GeoFossils Adamite specimen 193 under Mid Wave UV, displaying green fluorescence across multiple crystal clusters over the brown matrix.
GeoFossils Adamite specimen 193 shown in a split comparison, with natural daylight on one half and green fluorescence across multiple crystal clusters under Mid Wave UV on the other.
GeoFossils Adamite specimen 194 in daylight, showing a large yellow-green crystal-lined cavity within an orange-brown matrix.
GeoFossils Adamite specimen 194 under Mid Wave UV, with subtle fluorescence visible around the crystal-lined cavity and surrounding mineral areas.
GeoFossils Adamite specimen 194 shown in a split comparison, with natural daylight on one half and subtle Mid Wave UV fluorescence around the crystal-lined cavity on the other.
GeoFossils Adamite specimen 195 in daylight, showing scattered yellow-green crystals across a rugged brown and orange mineral matrix.
GeoFossils Adamite specimen 195 under Mid Wave UV, displaying small areas of green fluorescence among crystals across the rough matrix.
GeoFossils Adamite specimen 195 shown in a split comparison, with natural daylight on one half and small green fluorescent areas under Mid Wave UV on the other.
GeoFossils Adamite specimen 196 in daylight, showing a rusty orange-brown matrix with a dark crystal-lined cavity on the lower right.
GeoFossils Adamite specimen 196 under Mid Wave UV, with strong green fluorescence concentrated within the lower-right crystal cavity.
GeoFossils Adamite specimen 196 shown in a split comparison, with natural daylight on one half and strong green fluorescence within the lower-right cavity under Mid Wave UV on the other.
GeoFossils Adamite specimen 197 in daylight, with a dense reddish-brown botryoidal surface and a small greenish crystal cluster near the top.
GeoFossils Adamite specimen 197 under Mid Wave UV, showing localized green fluorescence from the small crystal cluster near the top.
GeoFossils Adamite specimen 197 shown in a split comparison, with natural daylight on one half and localized green fluorescence near the upper crystal cluster under Mid Wave UV on the other.
GeoFossils Adamite specimen 198 in daylight, showing a tall brown matrix with pale crystalline growth through a central cavity and ledge.
GeoFossils Adamite specimen 198 under Mid Wave UV, displaying green fluorescence along the central crystal-bearing seam and lower cluster.
GeoFossils Adamite specimen 198 shown in a split comparison, with natural daylight on one half and green fluorescence along the central crystal-bearing seam under Mid Wave UV on the other.
Adamite
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Discover fluorescent Adamite from Ojuela Mine, Mapimí, Durango, Mexico, a classic locality for this zinc arsenate mineral.

Tested by GeoFossils, these specimens display their strongest green fluorescence under Medium Wave (MW) UV. Green fluorescence is also visible under Short Wave (SW) and Long Wave (LW) UV, while some specimens show additional pale blue to blue-white fluorescent areas from an unidentified associated mineral phase.

The combination of Ojuela provenance and multi-wavelength fluorescence makes this material particularly relevant to collectors of fluorescent minerals and Mexican mineral specimens.

UV fluorescence

UV wavelength Observed response
Medium Wave (MW) Predominant green fluorescence
Short Wave (SW) Green fluorescence, generally weaker and more localised than MW
Long Wave (LW) Green fluorescence; some specimens also show pale blue to blue-white fluorescence from an unidentified associated mineral phase

These responses have been observed by GeoFossils on the material offered here. Fluorescence can vary between specimens and may appear different according to UV lamp output, ambient lighting and viewing conditions.

Scientific information

Property Information
Primary mineral Adamite
Chemical formula Zn₂(AsO₄)(OH)
Mineral class Arsenate
Mineral group Olivenite Group
Crystal system Orthorhombic
Mohs hardness 3.5
Typical lustre Vitreous
Locality Ojuela Mine, Mapimí, Durango, Mexico
Predominant UV wavelength Medium Wave (MW)
Observed fluorescence Green under MW, SW and LW

Formation & mineralogy

Adamite is a secondary zinc arsenate hydroxide that forms in the oxidised zones of zinc deposits containing arsenic-bearing minerals. It commonly occurs as distinct crystals, radial aggregates, rosettes and crystalline crusts.

The pale blue to blue-white fluorescent areas visible on some GeoFossils specimens have not been analytically identified and are therefore not attributed to a particular associated mineral.

Locality & collector significance

Ojuela Mine, Mapimí, Durango, Mexico, is a classic locality for Adamite and a diverse range of secondary arsenate minerals formed within its extensively oxidised mineral deposit.

The locality also has particular mineralogical significance as the type locality of paradamite, the triclinic dimorph of Adamite.

What causes the fluorescence?

The green fluorescence documented in some Ojuela Adamite is associated with trace uranyl ions within the mineral. Fluorescence can vary considerably between individual specimens.

GeoFossils has confirmed the fluorescent response of the material offered here but has not analytically determined the activator within each specimen.

Viewing your UV mineral

For the strongest observed response, view the specimen in a dark environment using an appropriate Medium Wave mineral UV lamp. Short Wave and Long Wave lamps can be used separately to observe the additional responses present within the material.

Always follow the UV equipment manufacturer's instructions and avoid looking directly into the UV light source.

Care instructions

Handle Adamite carefully and store it separately from harder minerals to reduce the risk of scratching or chipping. Remove loose dust with a soft, dry brush and avoid abrasive cleaning methods or harsh household chemicals.

Frequently asked questions

What colour does this Adamite fluoresce?
GeoFossils has observed green fluorescence under Medium Wave, Short Wave and Long Wave UV. Medium Wave produces the predominant response in this collection.

Which UV wavelength is best for viewing this Adamite?
Medium Wave (MW) produces the strongest green fluorescence observed by GeoFossils on this material.

What are the pale blue or blue-white fluorescent areas?
Some specimens contain an associated mineral phase that displays pale blue to blue-white fluorescence. This material has not been analytically identified, so GeoFossils does not attribute the response to a particular mineral.

Does every specimen fluoresce identically?
No. Natural variations in mineral distribution mean the coverage and intensity of fluorescence can differ between specimens.

Where is this Adamite from?
This material is from Ojuela Mine, Mapimí, Durango, Mexico.

Location

Ojuela Mine | Mapimí | Durango | Mexico

Please note

Natural mineral specimens vary in shape, colour, crystal coverage and fluorescent response. UV colours may also appear slightly different in person because lamp output, ambient lighting, camera settings and viewing conditions can affect their appearance.

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GeoFossils Adamite specimen 182 in daylight, showing pale yellow to clear crystals across a reddish-brown mineral matrix.
GeoFossils Adamite specimen 182 under Mid Wave UV, showing strong green fluorescence across crystal-rich areas of the brown matrix
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