Datolite
A variety of Datolite Subgroup
What is Datolite?
The calcium-based mineral datolite is quite profitable on the free gem market when cut and polished. This may be because most of the time it does not crystalize into a useable ornamental shape. In Russia, where it is abundant, this mineral is mined and processed to extrude Boron. Across the globe, there are various veins of datolite, but none as large as Russia's.
Etymology & Origins
It was first observed by Jens Esmark in 1806, and named by him from δατεῖσθαι, "to divide," and λίθος, "stone," in allusion to the granular structure of the massive mineral.
Uses & Applications
Datolite is an important source of boron in some areas. Boron is used in making items such as flares, rocket fuel igniters, fiberglass, and insulation. In the household, boron is sometimes used in eye drops, powdered soap, bleach, and as a food preservative. Datolite is also processed into gemstones or ornamental stones.
Optical Properties
- Refractive Index
- 1.621-1.675
- Birefringence
- 0.044-0.045
- Pleochroism
- None
- Optical Character
- Biaxial negative
- Dispersion
- 0.016
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Datolite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Datolite Localities Map
See where Datolite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- White, greyish, pale green, red, yellow, pink, etc
- Hardness (Mohs)
- 5 - 5.5
- Density
- 3 g/cm³
- Streak
- White
- Luster
- Vitreous, Resinous
- Crystal System
- Monoclinic
Chemical Properties
- Chemical Formula
- CaB(SiO4)(OH)
- Elements
- B, Ca, H, O, Si
Also Known As
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Datolite FAQs
How do I identify Datolite?
Datolite can be identified by its hardness of 5 - 5.5 on the Mohs scale, White color, Vitreous, Resinous luster, Monoclinic crystal system. Look for these key characteristics when examining specimens.
What color is Datolite?
Datolite typically appears in White, greyish, pale green, red, yellow, pink, etc. Color can vary depending on impurities and formation conditions.
How hard is Datolite?
Datolite has a hardness of 5 - 5.5 on the Mohs scale. This gives it moderate hardness.