Cobaltoan Calcite, aka Sphaerocobaltite is a cobalt carbonate minera. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown. This is a gorgeous specimen.
Quartz Always interesting are the casts. This is a quartz cast after magnesite. Sparkling with the tiny quartz faces and a deep red-purple color. From Brumado, Bahia, Brazil. Size: x x cm Country: Brazil Locality: Bahia
Orpiment is a deep orange-yellow colored arsenic sulfide mineral. It is found in volcanic fumaroles, low temperature hydrothermal veins, and hot springs and is formed both by sublimation and as a byproduct of the decay of another arsenic mineral, realgar.