$125Median
11Sold (12 mo)
$125Last sale
Conichalcite specimens for sale
21 for sale · $100–$12,500 USD
81 in the gallery
Conichalcite is a calcium copper arsenate hydroxide mineral that forms in crustal hydrothermal environments. It typically appears as delicate blue-green to green needles, crusts, or platy aggregates with a subtly vitreous to silky lustre, often coating chalcopyrite or other sulfides in secondary assemblages.
- Formula
- CaCu(AsO4)(OH)
- Rarity
- Uncommon
- Stability
- Moderately Stable
- Collector interest
- Moderate Interest
- Classification notes
- Arsenate mineral; copper calcium arsenate hydroxide (Strunz: 8.BA)
Key characteristics
- Crystal system
- orthorhombic
- Mohs hardness
- 4.5
- Specific gravity
- 4.2–4.35
- Luster
- vitreous, greasy
- Transparency
- transparent, translucent
- Color
- green, yellow, brown
- Streak
- green, yellow
- Cleavage
- none
- Fracture
- uneven, subconchoidal
- Crystal habit
- prismatic, acicular, botryoidal, reniform, stalactitic, druzy, granular, massive
Buy Conichalcite specimens
View all 21Where Conichalcite is found
Top localities
- Ojuela Mine18 specimens
- Mohawk mine5 specimens
- Mount Diablo pit4 specimens
- Gold Hill Mine3 specimens
- Bagdad Mine2 specimens
- Hilarion Mine2 specimens
- Jean Baptiste Mine2 specimens
- Mammoth mine2 specimens
- Milpillas Mine2 specimens
- Potosi Mine2 specimens
About Conichalcite
Notable specimens have come from Namibia, the USA, Mexico, Greece, and Australia, where secondary oxidation zones and low-temperature hydrothermal activity foster its formation. The mineral’s bright color and radiating or acicular habit make it visually distinctive in hand samples and on display shelves, and its association with copper-rich sulfides enhances its appeal for habit and paragenesis studies.
Collectors prize conichalcite for the combination of vivid color, relative rarity, and its role in classic secondary copper oxide localities. Specimens can show fine, threadlike crystals or botryoidal crusts that reveal the mineral’s distinctive composition and growth under specific hydrothermal conditions, providing a tangible link to the chemistry of arsenate minerals and copper-rich systems.
