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: 6.0 – 6.5
1 Soft10 Hard
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
Links may earn a commission at no extra cost to you.
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
About Andesine
Andesine is an intermediate plagioclase feldspar that became widely known as a gem material in the early 2000s when red to orange specimens were marketed as a new discovery from Tibet and Mongolia. It can display an attractive labradorescence in some specimens, as well as strong color in red, orange, and green hues. Considerable controversy surrounds much commercial andesine, with evidence suggesting many stones are artificially color-enhanced by copper diffusion treatment.
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Andesine?
Andesine is an intermediate plagioclase feldspar that became widely known as a gem material in the early 2000s when red to orange specimens were marketed as a new discovery from Tibet and Mongolia. It can display an attractive labradorescence in some specimens, as well as strong color in red, orange
What is the hardness of Andesine?
Andesine has a Mohs hardness of 6.0 to 6.5, making it moderate for use in jewelry.
What color is Andesine?
Andesine is primarily Various.
How much does Andesine cost?
Andesine falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Andesine?
Andesine belongs to the Triclinic crystal system.