Calcite with Goethite - Mexico 5" x 2" herkimer diamond Fluorite comes in one of

Fluorite comes in one of the widest ranges of colors that vary from the most common greens and purples to less common blues and reds

It is rated between 5 and 6 on the Mohs hardness scale due to its mineral composition that is a hydrated phosphate of copper/aluminum

5" in size

while amethyst is a violet stone that is believed to promote peace and tranquility

This is an exquisite cluster of small marine fossils (ammonites

Calcite with Goethite - Mexico 5" x 2" herkimer diamond Fluorite comes in one ofThis 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