Andesine
China
2.05 carats
© Mineral Classics
Andesine was first described in 1841 for an occurrence in the Marmato mine, Colombia. It is named after the Andes mountains of South America.
Andesine is found in a range of colours, from red, honey-red to orange, yellow, champagne and green.
Andesine Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Andesine Gemstones by Size
This table shows distribution of Andesine gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.41 cts
Heaviest:10.58 cts
Average:2.81 cts
Total photos:25
Do you have a larger Andesine? Why not upload a photo?
| General Information | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A variety or type of: | Feldspar | |||||||||
| Chemical Formula |
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| Andesine 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 | ||||||||||
| Physical Properties of Andesine | ||||||||||
| Mohs Hardness | 6 to 6.5, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Specific Gravity | 2.65 to 2.69, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Tenacity | Brittle, Gems, Sixth Edition (2006) | |||||||||
| Cleavage Quality | Perfect, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Fracture | Uneven,Conchoidal, Gems, Sixth Edition (2006) | |||||||||
| Optical Properties of Andesine | ||||||||||
| Refractive Index | 1.543 to 1.564, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Optical Character | Biaxial/+,-, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Birefringence | 0.007 to 0.011, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Dispersion | Weak, Gems, Sixth Edition (2006) | |||||||||
| Colour | ||||||||||
| Colour (General) | Light pink, also white, gray, yellowish, greenish., Gemstones of the world (2001) More from other references | |||||||||
| Transparency | Transparent,Translucent,Opaque, Gemmological Tables (2004) More from other references | |||||||||
| Lustre | Vitreous,Dull (Earthy), Gems, Sixth Edition (2006) Vitreous to dull | |||||||||
| Fluorescence & other light emissions | ||||||||||
| Fluorescence (Short Wave UV) | 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., Gems, Sixth Edition (2006) | |||||||||
| Fluorescence (Long-Wave UV) | Red andesine from the Democratic Republic of Congo fluoresced a weak to medium orange., Gems, Sixth Edition (2006) | |||||||||
| Crystallography of Andesine | ||||||||||
| Crystal System | Triclinic, Blue Chart Gem Identification (2010) More from other references | |||||||||
| Geological Environment | ||||||||||
| Where found: | 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., Gems, Sixth Edition (2006) | |||||||||
| Further Information | ||||||||||
| Mineral information: | Andesine information at mindat.org | |||||||||