Detailed sheet

colemanite

It pays tribute to W. Coleman (1824-1893), founder of the borax industry in California.



CHEMICAL CHARACTERISTICS

Ca[B3O4](OH)3 H2O

hidrated calcium borate



PHYSICAL CHARACTERISTICS

Main color

colourless

Other colors

white, grey, yellow

Color of streak

white

Luster

vitreous

Hardness

4.5 to 0.0

Density

2.40 to 2.42

Cleavage

perfect

Fracture

conchoidal



OPTICAL PROPERTIES

Transparency

translucent, transparent

Refractive index

1.586 - 1.615

Double refraction

0.028

weak, biaxial (+)

visible double refraction

Yes

Dispersion

faible

Pleochroism

absent

Number of colors

1

Fluorescence

weak

yellow



CRYSTALS PROPERTIES

short prismatic and often flattened

crystals system

monoclinic



OTHER INFORMATIONS

Exploited
sites

It is found mainly in desert areas or borax deposits were they get formed.
The death valley in the United States, Bolivia, Argentina, Kazakhstan, Turkey, Iran.

use in jewelry

it is faceted for collection

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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