Epidote in Matrix
Epidote · Mineral Specimen
Crystal System
Monoclinic; prismatic crystals with distinct striations, commonly occurring in granular or massive habits.
Mineral Group
Silicates; Sorosilicate subgroup
Chemical Formula
Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH)
Formation Process
Hydrothermal alteration and low-to-medium grade regional metamorphism (greenschist facies) of igneous and sedimentary rocks containing calcium and iron-rich minerals.
About This Crystal
The specimen displays a dark green to brownish-green elongated prismatic crystal embedded within a rough, earthy, weathered rock matrix. The crystal shows distinct longitudinal striations along its prism faces and a sub-vitreous to resinous luster.
Physical Characteristics
Pistachio-green to dark green or blackish-green body color, white to greyish streak, perfect cleavage in one direction, uneven to conchoidal fracture, specific gravity around 3.3 to 3.5, brittle tenacity, and generally non-fluorescent.
Optical Properties
Biaxial (-) with strong pleochroism showing shades of green, yellow-green, and brown. High refractive index ranging from approximately 1.715 to 1.797 and strong birefringence.
Hardness & Durability
Origin Region
Found worldwide with notable localities in Austria, Pakistan, Norway, and the USA (Alaska); forms in hydrothermal veins and metamorphic environments.
Hardness & Durability
Mohs hardness of 6 to 7. Moderate durability, but perfect cleavage makes it susceptible to splitting along specific planes if struck sharply. Not typically used in mainstream jewelry due to cleavage and deep dark color.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals, ultrasonic cleaners, and sudden thermal shock. Store separately from harder gemstones to prevent scratching.
Rarity & Value
Common mineral, but well-formed crystalline specimens on matrix are sought after by collectors. Value depends on crystal size, perfection, and aesthetic presentation on the matrix.
Special Characteristics
Exhibits strong pleochroism and distinct prismatic striations. Often associated with quartz, albite, and actinolite in alpine-type fissure veins.
Lore & History
In crystal healing traditions, epidote is considered a stone of attraction and manifestation, believed to amplify personal energy and release negativity. Historically named from the Greek word meaning 'increase' due to the base of its prism having one side longer than the other.