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Name Origin | Jeremejevite stone is named after Pavel V. Jeremejev, Russian mineralogist and engineer. |
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Chemical Formula | Al6B5O15(OH)3 |
Color | Colorless; pale blue-green, pale yellow-brown |
Hardness | 6.5 on Mohs Scale |
Crystal System | Hexagonal. Crystals elongated and tapering; small grains. |
Cleavage | None. Fracture conchoidal |
Specific Gravity (SG) | 3.28 - 3.31 |
Pleochroism | African material: light cornflower blue/colorless to light yellow |
Luster | Vitreous |
Stone sizes |
No gem cut from the U.S.S.R material; however, the Swakopmund have been cut, with gems up to about 5 carats possible. These are a lovely blue-green color, are relatively easy to cut, and hard enough to wear. |
Note: Until the S. W. African find, jeremejevite was an exceedingly rare mineral available in almost microscopic grains. The African crystals are amazing in that they are both large and gem form. The crystals are not abundant at the locality, so jeremejevite is still an extremely rare collector gemstone.
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Actinolite
Azurite
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Photo Credit:
"JeremejevitGreen-G-EmpireTheWorldOfGems" by DonGuennie (G-Empire The World Of Gems) - Own work http://www.g-empire.de. Licensed under CC BY-SA 4.0 via Commons - https://commons.wikimedia.org/wiki/File:JeremejevitGreen-G-EmpireTheWorldOfGems.jpg#/media/File:JeremejevitGreen-G-EmpireTheWorldOfGems.jpg
References:
1- Color Encyclopedia of Gemstones, Joel E. Arem, VNR publications, New York.
"JeremejevitGreen-G-EmpireTheWorldOfGems" by DonGuennie (G-Empire The World Of Gems) - Own work http://www.g-empire.de. Licensed under CC BY-SA 4.0 via Commons - https://commons.wikimedia.org/wiki/File:JeremejevitGreen-G-EmpireTheWorldOfGems.jpg#/media/File:JeremejevitGreen-G-EmpireTheWorldOfGems.jpg
References:
1- Color Encyclopedia of Gemstones, Joel E. Arem, VNR publications, New York.