Andesine

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6.0 – 6.5

Specific Gravity 2.65 – 2.69

Refractive Index 1.543 – 1.564

Crystal System Triclinic

Luster Vitreous,Dull (Earthy)

Cleavage Perfect

Fracture Uneven,Conchoidal

Color various

Birefringence 0.007

Mohs Hardness

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

Mohs	Reference mineral	Andesine
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 Andesine

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

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Treatments

Red and green: immersion - green center with red outer section may suggest a potentially copper diffused stone - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 9 6 to 6.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 2.65 to 2.69Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references BrittleMichael O?Donoghue, Gems, Sixth Edition (2006) PerfectHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Uneven,ConchoidalMichael O?Donoghue, Gems, Sixth Edition (2006) 1.543 to 1.564Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Biaxial/+,-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 0.007 to 0.011Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references WeakMichael O?Donoghue, Gems, Sixth Edition (2006) Light pink, also white, gray, yellowish, greenish.Walter Schumann, Gemstones of the world (2001) More from other references Transparent,Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Vitreous,Dull (Earthy)Michael O?Donoghue, Gems, Sixth Edition (2006) Vitreous to dull Blue, pink, yellow, yellowish brown. Weak red emission with an even weaker blue surface related luminescence has been reported for red andesine from the Democratic Republic of Congo.Michael O?Donoghue, Gems, Sixth Edition (2006) TriclinicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Andesine is only a minor constituent in most granites and syenites but is the dominant feldspar in a wide range of igneous rocks of basic to intermediate and certain igneous rocks called appropriately andesites. It is also found in some metamorphic rocks as a minor constituent.Michael O?Donoghue, Gems, Sixth Edition (2006) Andesine information at mindat.org