Boracite
A variety of Boracite Group
What is Boracite?
Boracite is a rare mineral often cut into faceted gems, but not particularly popular among collectors. It is found naturally in salt deposits, formed from seawater evaporation. It comes in several crystal habits in light shades of blue, green, yellow, gray, or white. When heated or under pressure, boracite generates an electric charge.
Etymology & Origins
The name is derived from its boron content (19 to 20% boron by mass).
Optical Properties
- Refractive Index
- 1.658-1.673
- Birefringence
- 0.010-0.011
- Pleochroism
- None
- Optical Character
- Biaxial positive
Boracite Market Value Calculator
Estimate the market value of Boracite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Boracite Localities Map
See where Boracite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Boracite
Boracite is typically found in evaporite sequences associated with gypsum, anhydrite, halite, sylvite, carnallite, kainite and hilgardite.
Quick Facts
Physical Properties
- Color
- Green, blue, colourless, grey, white, dark green (ferroan), colourless in transmitted light
- Hardness (Mohs)
- 7 - 7.5
- Density
- 2.97 g/cm³
- Streak
- White
- Luster
- Vitreous, Adamantine
- Crystal System
- Orthorhombic
Chemical Properties
- Chemical Formula
- Mg3(B7O13)Cl
- Elements
- B, Cl, Mg, O
Also Known As
Identify Boracite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you