Epidote | Gemopedia

A pearly transparent to nearly opaque gemstone, Epidote often has a yellowish-green or green "pistachio" color. Small faceted stones may appear black due to the dark nature of the colors. Epidote specimens are often appreciated for their dramatic crystal displays.
Alternate
Names
Pistacite- Yellow Green
Colors
Light To Very Dark Green To Brown

Epidote Classification

Common Name

Epidote

Species

Epidote

Variety

Colors

Light To Very Dark Green To Brown

Alternate Names

Pistacite- Yellow Green

Gemstone Groups

Epidote

Key Separations

RI, birefringence, optic character (might show pseudo-uniaxial optic figure) and spectrum

Comments

Epidote Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.729-1.768
Tolerance:(+0.012/-0.035)

Birefringence

0.019-0.045

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: inert
LWUV: inert

CCF Reaction

Pleochroism

Trichroic, strong green, brown, and yellow

Dispersion

Strength: strong fire Value: 0.03

Comments

Epidote Chemistry & Crystallography

Chemical Name

calcium aluminum iron silicate

Chemical Formula

Ca2(Al,Fe)3(SiO4)3(OH)

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Epidote Characteristic Physical Properties

Hardness

6-7

Streak

Gray

Specific Gravity

3.35-3.5 Typical:3.4

Toughness

Varies

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal, Uneven

Cleavage

Perfect, in one direction, Good, in one direction

Comments

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