Diaspore
A variety of Diaspore Group
What is Diaspore?
The most valuable and highly-sought type of diaspore is Zultanite, a rare, transparent, faceted gem which is mined and manufactured in Turkey. This type is significantly larger than other forms of diaspore, which are considered valueless in the gemstone trade. This mineral is a component of Bauxite, which is regularly used as a source of aluminum.
Etymology & Origins
It was first described in 1801 for an occurrence in Mramorsk Zavod, Sverdlovskaya Oblast, Middle Urals, Russia. The name, which was coined by René Just Haüy, is from the Greek for διασπείρειν, to scatter, in allusion to its decrepitation on heating.
Uses & Applications
Diaspore is valued for its refractory properties and is used most frequently to make refractory bricks; low-quality pieces are a filler for the plastics industry. Gem-quality pieces from Turkey are sold under the trade names csarite, ottomanite, and zultanite.
Optical Properties
- Refractive Index
- 1.702-1.750
- Birefringence
- 0.048
- Optical Character
- Biaxial positive
Diaspore Market Value Calculator
Estimate the market value of Diaspore using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Diaspore Localities Map
See where Diaspore is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
The Meaning
Diaspore is a birthstone for the zodiac sign of Pisces.
Quick Facts
Physical Properties
- Color
- white, brown, colourless, pale yellow, greyish, greenish grey, lilac, pinkish
- Hardness (Mohs)
- 6.5 - 7
- Density
- 3.38 g/cm³
- Streak
- white
- Luster
- Pearly, Vitreous
- Crystal System
- Orthorhombic
Chemical Properties
- Chemical Formula
- AlO(OH)
- Elements
- Al, H, O
Also Known As
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