and is very soft at only 1 on Mohs' hardness scale

One of the distinguishing features of apophyllite is its ability to form well-defined crystals with a pyramid-like shape

The color can vary based on the presence of copper and iron

Shape: Round faceted

are between 35 - 80 Carats each and measure 20 - 35 mm (0

Tetrahedrite, Pyrite and Quartz Crystal | AAA Cluster | 642 Grams | Peru | SO24 Aventurine and is very soft atThis beautiful cluster combines tetrahedrite, cubic and crystallized pyrite matrix 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 and other