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Formula: CaCu(VO4)(OH)
Valence: CaCu2+V5+O4(OH)
Anhydrous vanadate of copper and calcium,
adelite-descloizite group, forms a series with
conichalcite.
Specific gravity: 3.75
Hardness: 3½
Streak: Light yellow green
Colour: Yellow, yellow-green, olive green, green to dark green; light green in transmitted light.
Solubility: Soluble in acids
Environments
Sedimentary environments
Hydrothermal environments
Tangeite is a rare secondary supergene
copper-vanadium mineral occurring in
the oxidised zones of vanadium-bearing
sandstone deposits
(Webmin, Mindat, HOM).
Localities
At Friedrichroda, Thuringia, Germany, tangeite is found with
crednerite and manganese oxides
(Dana).
At the Molinello mine, Italy, tangeite is associated with rhodonite,
quartz, pyrobelonite,
chalcocite, neotocite and
copper
(HOM).
Tangeite from the Molinello Mine -
Image
At the type locality, the Tyuya-Muyun Cu-V-U deposit, Aravan District, Osh, Kyrgyzstan, tangeite occurs in
sedimentary deposits
(Mindat) associated with calcite,
malachite and baryte
(HOM).
Tangeite from the Tyuya-Muyun Cu-V-U deposit -
Image
At the the Butterley and Blaby Brick Pit, Glen Parva, Leicestershire, England, UK, tangeite has been found
exposed in
mudstone, surrounded by crusts of
volborthite
(JRS 11.54-58).
At the New Cliffe Hill quarry, Leicestershire, England, UK, tangeite is one of a suite of
vanadium
minerals found in
supergene copper
mineralisation. It occurs as masses
in cavities in a ferruginous
dolomite vein with calcite and
baryte
(JRS 11.54-58).
Tangeite from the New Cliffe Hill Quarry -
Image
At the Gallagher Vanadium Property, Cochise County, Arizona, USA, tangeite has been found as small (less than 0.3 mm)
crystals on
iron-stained quartz and anglesite in
a single specimen on
the mine dump
(R&M 90.4.345).
Ar Garnet Ridge, Arizona, USA, tangeite is associated with malachite,
chrysocolla, tyuyamunite,
chalcopyrite, pyrite and
limonite
(HOM).
In the sandstones of south western Colorado, USA, tangeite is found with
carnotite and
tyuyamunite
(Dana).
At the Manganese Mine, Keweenaw County, Michigan, USA, tangeite occurs as granular to powdery patches coating
fractures in
calcite and manganese oxides
(macfallite,
orientite, braunite and
hollandite)
(R&M 89.6.510).
Tangeite from the Manganese Mine -
Image
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