Ettringite
South Africa
0.51 carats
© Mineral Classics
Ettringite forms colourless to pale yellow transparent to opaque crystals, which can be faceted.
Ettringite 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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Ettringite Gemstones by Size
This table shows distribution of Ettringite 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:.42 cts
Heaviest:0.51 cts
Average:0.46 cts
Total photos:2
Do you have a larger Ettringite? Why not upload a photo?
| General Information | ||||||||||||||||||||||||||
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| Chemical Formula |
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| Physical Properties of Ettringite | ||||||||||||||||||||||||||
| Mohs Hardness | 2 to 2.5, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Specific Gravity | 1.77, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Cleavage Quality | Perfect, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Optical Properties of Ettringite | ||||||||||||||||||||||||||
| Refractive Index | 1.470 to 1.491, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Optical Character | Uniaxial/-, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Birefringence | 0.021, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Colour | ||||||||||||||||||||||||||
| Colour (General) | Colourless to pale yellow, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Transparency | Transparent,Translucent,Opaque, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Crystallography of Ettringite | ||||||||||||||||||||||||||
| Crystal System | Hexagonal, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Habit | Prismatic, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Geological Environment | ||||||||||||||||||||||||||
| Where found: | Occurs in metamorphosed limestones near igneous contacts or in xenoliths, Gems, Sixth Edition (2006) | |||||||||||||||||||||||||
| Further Information | ||||||||||||||||||||||||||
| Mineral information: | Ettringite information at mindat.org | |||||||||||||||||||||||||
| Significant Gem Localities | ||||||||||||||||||||||||||
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