Calcite with Goethite - Mexico 5" x 2" Lightning Typically dark brown or black

Typically dark brown or black in color

adding a touch of elegance and durability

with water containing dissolved calcium and sulfate ions precipitating out and forming the Enhydrite crystals on the surface of the specimen

This mineral is found in Indonesia

From Tuscon

Calcite with Goethite - Mexico 5" x 2" Lightning Typically dark brown or blackThis spectacular piece features Calcite infutilized with intricate Goethite. Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 3 as "calcite". How is calcite formed? Calcite can form by direct precipitation from waters rich in calcium. As concentrations increase or the amount of water decreases crystals of solid calcite crystals