jeremejevite
Sign in to saveJeremejevite is an aluminium borate mineral with variable fluoride and hydroxide ions. Its chemical formula is . It is considered as one of the rarest, thus one of the most expensive stones. For nearly a century, it was considered as one of the rarest gemstones in the world.
Key facts
- Mineral.name
- Jeremejevite
- Mineral.category
- Borate mineral
- Mineral.boxbgcolor
- b5b5dc
- Mineral.image
- File:Jeremejevite-273103.jpg
- Mineral.imagesize
- 260px
- Mineral.IMAsymbol
- Jer
- Mineral.strunz
- 6.AB.15
- Mineral.system
- Hexagonal
- Mineral.symmetry
- P6/m
- Mineral.color
- Colorless, white, yellowish, blue, light yellow brown, aquamarine blue, rarely violet; colourless in transmitted light
- Mineral.habit
- Prismatic
- Mineral.cleavage
- None observed
- Mineral.fracture
- Conchoidal
- Mineral.mohs
- 6.5 – 7.5
- Mineral.luster
- Vitreous
- Mineral.refractive
- n = 1.653 n = 1.640
- Mineral.opticalprop
- Uniaxial (-)
- Mineral.birefringence
- 0.0130
via Wikipedia infobox
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Encyclopedic overview
4 sectionsContents
- Properties
- Mining and localities
- Jewelry industry
- References
Jeremejevite is an aluminium borate mineral with variable fluoride and hydroxide ions. Its chemical formula is . It is considered as one of the rarest, thus one of the most expensive stones. For nearly a century, it was considered as one of the rarest gemstones in the world.
It was first described in 1883 as small, single crystals in loose granitic debris in Mt. Soktui, Nerschinsk district, Adun-Chilon Mountains, Siberia. It was named after Pavel Vladimirovich Eremeev, Russian mineralogist, engineer and professor, who collected the first specimens (Jeremejev, German; 1830–1899).
Excerpted from Wikipedia’s “jeremejevite” article, available under the CC BY-SA 4.0 licence.