Oxidized Pyrite with Quartz – Hekou, Yunnan, China – 458g Schiller The elongated structure shows fine

The elongated structure shows fine vertical striations along the prism faces

Locality: Brazil

The host rock gives a beautiful contrast the the green emeralds

A beautiful Tanzanite crystal specimen displaying natural unheated violet-blue color on what appears to be a slightly greenish prehnite from Tanzania

giving the pair a well-defined and attractive color separation

Oxidized Pyrite with Quartz – Hekou, Yunnan, China – 458g Schiller The elongated structure shows fineA visually striking specimen featuring dark metallic crystals set among a dense cluster of quartz from Hekou, Yunnan, China. The larger crystals display deep reddish brown to black coloration and retain the sharp crystal form of pyrite. While the exact identity of these crystals has not been confirmed, they are believed to represent oxidized pyrite based on a cut section from a similar specimen that revealed something that looks like fresh metallic