description Epidote Overview
Epidote is a calcium-aluminum-iron sorosilicate mineral with a monoclinic crystal structure and a composition commonly written as Ca2(Al,Fe)3(SiO4)(Si2O7)O(OH). It forms in a range of igneous and metamorphic rocks, as granular masses and prismatic crystals. Its characteristic colors run from pistachio and yellow-green to brown and greenish black; transparent crystals may be collected or cut as gemstones, and epidote is also a component of the decorative rock unakite.
help Epidote FAQ
What is epidote made of?
Epidote is a calcium-aluminum-iron sorosilicate mineral. Its composition is commonly written as Ca2(Al,Fe)3(SiO4)(Si2O7)O(OH), and it has a monoclinic crystal structure.
What color is epidote?
Epidote is best known for pistachio green to yellow-green colors, caused partly by its iron content. It can occur as granular rock material or as prismatic crystals.
Where does epidote form?
Epidote forms in both igneous and metamorphic rocks. It is especially associated with rocks altered by heat, pressure, or mineral-rich fluids.
Is epidote used as a gemstone?
Transparent epidote crystals can be cut as collector gemstones, although the material is not as common in jewelry as quartz or corundum. Its color and prismatic crystal form are often more important to mineral collectors than its commercial jewelry use.
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