Clinozoisite | Gemopedia

Named for its resemblance to zoisite, clinozoisite is a colorless to pale grayish-yellow to green-colored mineral ideal for faceting. This gem was first discovered in Austria 1896, but there are many locations world wide where specimens have been found.
Colors
Colorless, Yellow, Yellow-Brown, Greenish, Pink

Clinozoisite Classification

Common Name

Clinozoisite

Species

Clinozoisite

Variety

Colors

Colorless, Yellow, Yellow-Brown, Greenish, Pink

Alternate Names

Gemstone Groups

Epidote

Key Separations

RI, birefringence and optic character

Comments

Clinozoisite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.67-1.734

Birefringence

0.01

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Comments

Clinozoisite Chemistry & Crystallography

Chemical Name

calcium aluminum silicate hydroxide

Chemical Formula

Ca2Al3(SiO4)3(OH)

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Clinozoisite Characteristic Physical Properties

Hardness

6-7

Streak

White To Gray

Specific Gravity

3.21-3.38

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Uneven

Cleavage

Perfect, in one direction

Comments

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