Pharmacolite
1 in the gallery
Pharmacolite is a calcium arsenate hydrate mineral that forms as a secondary phase in oxidized zones of arsenic-rich environments. It typically crystallizes as small, tabular to platy crystals, often with a vitreous to pearly luster and a pale to colorless to light blue-green color that can be quite delicate. The mineral commonly occurs in association with other arsenates and phosphates, reflecting its formation under relatively dry, low-temperature conditions near hydrothermal or supergene environments. Chile is a well-known source for Pharmacolite specimens, where oxidized pockets and neuropathic arid terrains yield small, well-formed crystals that are prized by collectors for their subtle coloration and crystal habit. Collectors value Pharmacolite for its rarity in many localities and the challenge of finding well-preserved, sharp faces with clean termination, often showcased in small crystals within matrix or vug-like cavities.
- Formula
- Ca(HAsO4) · 2H2O
- Rarity
- Rare
- Stability
- Moderately Stable
- Collector interest
- Moderate Interest
Where Pharmacolite is found
About Pharmacolite
Overall, Pharmacolite appeals to collectors who seek delicate arsenate minerals with distinctive platy forms and gentle luster. Its connection to specific geochemical environments and limited, high-quality finds makes encountering representative specimens a noteworthy achievement for mineral enthusiasts and collection display. Proof of a mineral’s formation environment and its crystal habits contribute to its appeal, as does the quiet elegance of its pale hues when light passes through thin, translucent faces.