Epidote
Epidote · Mineral Specimen and Collector Mineral
Crystal System
Monoclinic; typically forms prismatic, elongated crystals, but often found as granular, massive, or fibrous aggregates.
Mineral Group
Silicates, specifically Sorosilicates
Chemical Formula
Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH)
Formation Process
Metamorphic and Hydrothermal; forms through the alteration of calcium- and aluminum-bearing minerals such as plagioclase feldspar and amphibole during regional metamorphism or hydrothermal activity.
About This Crystal
The specimen is a small, irregular rough rock fragment featuring a characteristic yellowish-green to pistachio-green color with a fine-grained, crystalline texture. It is opaque with a sub-vitreous to resinous luster and exhibits a rough, uneven surface typical of a broken fragment.
Physical Characteristics
Color ranges from pistachio-green, yellowish-green to dark green or blackish-green. Streak is uncolored or greyish-white. Cleavage is perfect in one direction. Fracture is uneven to splintery. Specific gravity is approximately 3.3 to 3.5. Tenacity is brittle.
Optical Properties
Biaxial (-) with high refractive indices ranging from 1.715 to 1.797. Exhibits strong pleochroism in shades of green, yellow-green, and brown.
Hardness & Durability
Origin Region
Found globally with notable deposits in Austria, Pakistan, Norway, Mexico, and the USA (Alaska). Typically forms in hydrothermal veins and low-grade regional metamorphic rocks.
Hardness & Durability
Mohs hardness of 6 to 7. Toughness is fair to poor due to perfect cleavage. Not ideal for everyday high-wear jewelry unless securely protected in settings.
Care & Maintenance
Clean gently with warm, soapy water and a soft brush. Avoid harsh chemical cleaners, ultrasonic cleaners, and sudden temperature shocks. Store separately from harder gemstones to prevent scratching.
Rarity & Value
Common as a mineral specimen, though fine, distinct crystallized specimens can command higher collector values. Generally affordable in rough, massive forms.
Special Characteristics
Strong pleochroism and distinctive pistachio-green coloration. Can sometimes display weak fluorescence under certain UV conditions depending on trace impurities.
Lore & History
In crystal healing, epidote is traditionally considered a stone of increase and manifestation, believed to amplify personal energy, release negativity, and clear emotional blockages. Associated with the heart chakra.