Anorthite
Miyake Island, Miyake Subprefecture, Tokyo Metropolis, Japan
0.52 carats
© Stefan Ix
Anorthite 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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Anorthite Gemstones by Size
This table shows distribution of Anorthite 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:0.52 cts
Heaviest:7.08 cts
Average:4.06 cts
Total photos:4
Do you have a larger Anorthite? Why not upload a photo?
| General Information | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A variety or type of: | Feldspar | |||||||||||||
| Varieties/Types: | Bytownite - A plagioclase Feldspar with an Albite: Anorthite molar ratio ranging from 10:90 to 30:70. Labradorite - A plagioclase Feldspar with an Albite: Anorthite molar ratio ranging from 30:70 to 50:50. | |||||||||||||
| Chemical Formula |
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| Physical Properties of Anorthite | ||||||||||||||
| Mohs Hardness | 6 to 6.5, Gemmological Tables (2004) More from other references | |||||||||||||
| Specific Gravity | 2.77, Gemmological Tables (2004) More from other references | |||||||||||||
| Tenacity | Brittle, Gems, Sixth Edition (2006) | |||||||||||||
| Cleavage Quality | Perfect, Gemmological Tables (2004) More from other references | |||||||||||||
| Fracture | Uneven,Conchoidal, Gems, Sixth Edition (2006) | |||||||||||||
| Optical Properties of Anorthite | ||||||||||||||
| Refractive Index | 1.575 to 1.588, Gemmological Tables (2004) More from other references | |||||||||||||
| Optical Character | Biaxial/-, Gemmological Tables (2004) More from other references | |||||||||||||
| Birefringence | 0.013, Gemmological Tables (2004) More from other references | |||||||||||||
| Colour | ||||||||||||||
| Colour (General) | Usually white, grey or colourless but can be pale shades of other colours. Occassionally reddish, Gems, Sixth Edition (2006) More from other references | |||||||||||||
| Transparency | Transparent,Translucent, Gemmological Tables (2004) More from other references | |||||||||||||
| Lustre | Vitreous,Dull (Earthy), Gems, Sixth Edition (2006) | |||||||||||||
| Fluorescence & other light emissions | ||||||||||||||
| Fluorescence (Long-Wave UV) | Cream, pale brown, Gems, Sixth Edition (2006) | |||||||||||||
| Crystallography of Anorthite | ||||||||||||||
| Crystal System | Triclinic, Gemmological Tables (2004) More from other references | |||||||||||||
| Geological Environment | ||||||||||||||
| Where found: | Anorthite is usually found in contact metamorphic limestones and as a constituent in some basic calc-alkali plutonic rocks and lavas., Gems, Sixth Edition (2006) | |||||||||||||
| Further Information | ||||||||||||||
| Mineral information: | Anorthite information at mindat.org | |||||||||||||