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Conichalcite or cuprian Austinite

#PD31617

Conichalcite or cuprian Austinite

#PD31617
Availability
Sold
Size
7.5 x 5.5 x 3 cm - Sm Cabinet 
Formula
CaCuAsO4(OH) (RRUFF)
Locality
Mina Ojuela, Mapimi, Durango, Mexico
Tagged
arsenate

You will see on occassion Conichalcite like this specimen offered as "barthite". Barthite, however, is an obsolete name as research has shown that barthites are crystallized in discrete phases and not necessarily as a complete solid solution. Further, reports indicate that colorless Austinite is crystallized first and nearly pure Conichalcite is crystallized last. (MR V34, no. 5 pg 62). You would have to check with EDS all specimens to accurately nail down the chemistry and you would have to segregate the zones. We had Cannon check another specimen just like this one and the EDS showed Ca, Zn, Cu. This specimen may also be cuprian Austine.

Conichalcite

Formula
CaCuAsO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Reniform, Massive 
Cleavage
None, None, None 
Luster
Vitreous - Greasy 
Color
yellow green, emerald green 
Streak
light green 
Class
Orthorhombic - Disphenoidal 
Fracture
Brittle - Uneven 
Hardness
4.5 

Data courtesy of Webmineral.

Collection
Phillips Collection

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