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Lazulite

>> Group(s) : phosphates
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Not to be confused with lazurite, the main constituent of lapis lazuli. Lazulite is also called Klaprothite, in honor of the German mineralogist Klaproth (1743-1817) who discovered titanium and uranium, and described this stone. The name fell into disuse but it would avoid confusion between lazulite, lazurite, lapis lazuli and azurite.
The lazulite gets its name or from the old German "Lasurstein" for blue stone, or from the Arab-Persian "azul" for blue, because of its color. It forms a series with scorzalite, of which it is the magnesian pole.

Exploited sites

It is found in aluminous metamorphic rocks, such as quartzite and in some granitic pegmatites in Angola, Austria (Werfen, Salzburg), Canada (Yukon), Bolivia, Brazil (Minas Gerais), United States (North Carolina, Mountains Grave in Georgia), India, Madagascar, Sweden.

See pictures of the mines / other pictures

Use in jewelry

Only the transparent crystals are cut, it is a collection stone

Looking alike stones

azurite , benitoite , iolite , kyanite , dumortierite , lazurite , sodalite , topaz

Historical healing properties

it would have more or less the same effects of lapis lazuli

Chemical characteristics
MgAl2[PO4]2(OH)2

magnesium and aluminum phosphate

Physical characteristics

Main color : blue

Other colors : green

grass green variety found in 1994

Color of streak : white

Luster : vitreous

Hardness : 5.0 to 6.0

Density : 3.05 to 3.15

Cleavage : indistinct

Fracture : uneven

Optical properties

Transparency : transparent, translucent, opaque

very small transparent crystals

Refractive Index : 1.612 - 1.646

Double refraction : 0.031

Definite, biaxial (-)

visible double refraction : no

Dispersion : -

Pleochroism : very strong

Number of colors : 2

Colorless, deep blue

Fluorescence : none

Crystals

Very rare, sharp pyramidal prisms

cristaux

Crystal system : monoclinic

Other informations
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