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>> Group(s) : borates
See the pictures :

Discovered in 1952 in Sri Lanka and recognized as a specific mineral species, as previously mistaken for peridot.
Its name comes from the Sanskrit "Sinhala", Ceylon, the ancient name of Sri Lanka. Stone of a good hardness.

Exploited sites

The known deposits are in Burma, Tanzania, Canada (Quebec), Russia and of course Sri Lanka

See pictures of the mines / other pictures

Use in jewelry

Is faceted and can be used to make rings. Currently little used but it has all the qualities of robustness to be used in jewelry.

Looking alike stones

beryl , chrysoberyl , peridot , tourmaline , zircon

Chemical characteristics

magnesium and aluminum borate

Physical characteristics

Main color : brown

Other colors : yellow, pink, green

honey-colored, sometimes brown - greenish or pinkish

Color of streak : white

Luster : vitreous, resinous

Hardness : 6.5 to 7.0

Density : 3.45 to 3.50

Cleavage : none

Fracture : conchoidal

Optical properties

Transparency : transparent

Refractive Index : 1.665 - 1.712

Double refraction : 0.035

Definite, biaxial (-)

visible double refraction : yes

Dispersion : 0.018 (0.010)

Pleochroism : definite

Number of colors : 3

Green, light brown, dark brown

Absorption spectrum : 463

yellow sinhalite spectrum system

yellow sinhalite spectrum system

Fluorescence : none


Short prismatic, often not well shaped


Crystal system : orthorhombic

Other informations
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