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Clinozoisite

Clinozoisite

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: September 2023
Clinozoisite Polished Clinozoisite Rough
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Table of Contents
  • General Information
  • Clinozoisite Colors
  • Countries of Origin
  • Care
  • Species/Variety

Clinozoisite has the same chemical formula as zoisite, but it is a member of the monoclinic crystal system. It forms in a series with epidote, but it lacks the required amount of iron in its chemical formula to qualify as epidote. Clinozoisite can be colorless, gray, green, yellowish green to pale yellow, brown, and pink. This gem was first discovered in East Tyrol, Austria in 1896. Crystals are typically elongated and have parallel striations. Specimens from the Skardu Area, Gilgit-Baltistan, Pakistan are highly sought after but noteworthy specimens also come from Europe and the United States.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Clinozoisite
Species
Clinozoisite
Transparency
Transparent - Translucent
Refractive Index
1.670-1.734
Birefringence
0.010
Optic Character
Biaxial
Optic Sign
Positive
Polariscope Reaction
Aggregate (AGG), Doubly Refractive (DR)
Fluorescence
SWUV: Inert
LWUV: Inert
Pleochroism
Unobservable
Hardness
6-7
Streak
White To Gray
Specific Gravity
3.210-3.380
Toughness
Poor
Luster
Vitreous
Fracture
Uneven
Cleavage
Perfect, in one direction
Chemical Name
calcium aluminum silicate hydroxide
Chemical Formula
Ca2Al3(SiO4)3(OH)
Crystal System
Monoclinic
Chemistry Classification
Silicate

Clinozoisite Colors

  • Brown Clinozoisite
    Brown
  • Colorless Clinozoisite
    Colorless
  • Green Clinozoisite
    Green
  • Pink Clinozoisite
    Pink
  • Yellow Clinozoisite
    Yellow

Countries of Origin

Myanmar; Cyprus; Kazakhstan; Portugal; Greece; Austria; Morocco; Unknown; Mali; Brazil; Chile; Nepal; Colombia; Ecuador; Argentina; Iran (Islamic Republic of); Hungary; Japan; Taiwan (Province of China); India; Trinidad And Tobago; New Zealand; Canada; Turkey; Belgium; Senegal; Namibia; Finland; Italy; South Africa; Antarctica; Peru; Germany; Tanzania, United Republic Of; Afghanistan; Russian Federation; Czechia; United States of America; Madagascar; Thailand; United Kingdom of Great Britain and Northern Ireland; Sweden; Pakistan; Malawi; China; Ireland; Poland; Slovakia; Bulgaria; France; Romania; Switzerland; Spain; Cuba; Burkina Faso; Norway; Dominican Republic; Mexico; Zimbabwe; Australia; Greenland; Indonesia

Care

Clinozoisite has perfect cleavage and is brittle so take care when handling.

Species/Variety

Clinothulite

Clinothulite contains Mn3+ and due to its pink color, it is often mistaken for thulite the pink variety of zoisite.

  • Classification
Common Name
Clinothulite
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