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>> Group(s) : silicates
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Its name comes from the Greek "hemi," half and "morpho" to form, due to the different shape of the tip of its doubly terminated crystals. It was identified by Kenngott in 1853.
There is a "matrix" form blue and banded. As Tourmaline it presents the phenomenon of piezoelectricity and pyroelectricity.

Exploited sites

It is found in Mexico, Italy, Namibia, Austria, Australia, Algeria, United States, China, Congo, Russia, Greece and Zambia .

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Use in jewelry

collection stone

Looking alike stones

chrysocolla , smithsonite , turquoise , variscite

Historical healing properties

It would be the stone of quiet balance. It should be posed to people and children by creating a pleasant atmosphere.

Chemical characteristics

zinc silicate

Physical characteristics

Main color : blue

Other colors : white, brown, colourless, yellow, green, purple

Color of streak : white

Luster : vitreous, silky, pearly, dull

Hardness : 4.5 to 5.0

Density : 3.30 to 3.50

Cleavage : perfect

Fracture : conchoidal, uneven


Optical properties

Transparency : transparent, translucent

Refractive Index : 1.613 - 1.635

Double refraction : 0.022

Definite, biaxial positive

visible double refraction : yes

Dispersion : 0.020 (0.013)

Pleochroism : absent

Number of colors : 1

Fluorescence : variable

According to origins, fluorescence colored by metallic ions


Tabular, massive mamillary aggregates

Crystal system : orthorhombic

Other informations
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