Detailed sheet

boracite

It takes its name from its boron content, it was discovered in Germany in Lower Saxony in 1789.



CHEMICAL CHARACTERISTICS

Mg3[B7O13]Cl

magnesium borate mineral



PHYSICAL CHARACTERISTICS

Main color

green

Other colors

white, blue, grey, colourless, yellow

greenish

Color of streak

white

Luster

adamantine, vitreous

Hardness

7.0 to 7.5

Density

2.95 to 0.00

Cleavage

none

Fracture

conchoidal, uneven



OPTICAL PROPERTIES

Transparency

translucent, transparent

Refractive index

1.657 - 1.675

Double refraction

0.010

weak, biaxial (+)

visible double refraction

No

Dispersion

0,024(0.012)

Pleochroism

absent

Number of colors

1

Fluorescence

none

very rarely fluorescent



CRYSTALS PROPERTIES

many almost cubic facets

crystals system

orthorhombic



OTHER INFORMATIONS

Exploited
sites

It is found in Germany, Bolivia, Colombia, Australia, United States (Louisiana), in Kazakhstan.

use in jewelry

it’s a collection stone only

Daily care
and precautions

It is soluble in water.

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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