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Formula: MgAl(BO4)
Anhydrous borate
Crystal System: Orthorhombic
Specific gravity: 3.475 to 3.50 measured, 3.45 calculated
Hardness: 6½ to 7
Streak: White
Colour: Colourless, pale grey, pale yellow, pale pink, green-brown to dark brown
Environments
Sinhalite is a rare accessory mineral usually formed as irregular masses in boron-rich skarn
at the contact of limestone with granite
or gneiss; it rarely forms euhedral crystals in mineralised
marble. Associated minerals include spinel,
serendibite, ludwigite and
warwickite
(HOM, Mindat, Webmin).
The type locality is Sri Lanka.
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