Zoisite

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6.0 – 7.0

Specific Gravity 3.2 – 3.5

Refractive Index 1.685 – 1.707

Crystal System Orthorhombic

Luster Vitreous

Cleavage Perfect

Fracture Conchoidal

Color various

Birefringence 0.006

Dispersion 0.0196

Pleochroism Strong

Mohs Hardness

Mohs hardness of Zoisite shown against the ten reference minerals, from talc (1) to diamond (10).

Mohs	Reference mineral	Zoisite
1	Talc
2	Gypsum
3	Calcite
4	Fluorite
5	Apatite
6	Orthoclase	●
7	Quartz	●
8	Topaz
9	Corundum
10	Diamond

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Zoisite

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

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Treatments

6 to 7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 3.20 to 3.50Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references PerfectUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references ConchoidalArthur Thomas, Gemstones (2009) 1.685 to 1.707Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Biaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 0.006 to 0.013Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references StrongArthur Thomas, Gemstones (2009) 0.0196Arthur Thomas, Gemstones (2009) RareHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Green, brown, red-violet, bluish-greenUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Blue, (tanzanite - heat treated), V4+ in octahedral coordination; with V3+ in octahedral coordination. Brown-violet, V3+ in octahedral coordination (treatment turns blue, tanzanite). Green, Cr3+ in octahedral coordination. Pink (thulite), Mn3+ in presumably octahedral coordinationW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) Transparent,Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references VitreousArthur Thomas, Gemstones (2009) OrthorhombicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references PrismaticMichael O?Donoghue, Gems, Sixth Edition (2006) More from other references Occurs in medium-grade regionally metamorphosed crystalline schists formed from igneous, sedimentary or metamorphic rocks relatively high in calcium.Michael O?Donoghue, Gems, Sixth Edition (2006) Zoisite information at mindat.org Pakistan  Blauwet (2006) Tanzania  Dirlam et al. (1992) [var: Tanzanite] Malisa (2003) [var: Tanzanite] Malisa (2003) [var: Tanzanite] Malisa (2003) [var: Tanzanite] Malisa (2003) [var: Tanzanite] Malisa (2003) [var: Tanzanite] Malisa (2003)