Tetrahedrite, Pyrite, Calcite and Quartz Crystal Cluster | 121.6 Grams | Lima Peru Spodumene It appears to have been

It appears to have been caused by the pressure of the internal crystal growth

They were discovered at the end of the 18th century

8-gram Libyan Desert Glass with dimensions of 52x28x19 mm

3 Carats / 36

3 Grams / 13

Tetrahedrite, Pyrite, Calcite and Quartz Crystal Cluster | 121.6 Grams | Lima Peru Spodumene It appears to have beenThis beautiful cluster combines tetrahedrite, cubic and crystallized pyrite matrix, calcite and tiny terminated quartz crystals. Tetrahedrite crystals are fascinating minerals known for their distinctive tetrahedral shape and shiny, metallic luster. It typically forms in well defined tetrahedral crystals, which can be grouped in clusters. The color range includes shades of metallic gray, black, and sometimes reddish hues due to the presence of copper