description Sinhalite Overview
Sinhalite is a magnesium aluminum borate mineral with the chemical formula MgAlBO4. It was identified as a distinct mineral after specimens from Sri Lanka had been mistaken for peridot, and its name refers to the island's historical name, Sinhala. Transparent material can be cut as a gemstone and commonly appears in yellow, brownish-yellow, or greenish-brown colors. It is an uncommon mineral in both collecting and jewelry contexts.
help Sinhalite FAQ
What is the chemical formula of sinhalite?
Sinhalite is magnesium aluminum borate with the formula MgAlBO4 and an orthorhombic crystal structure. Transparent stones can be yellow, greenish-brown, or brown.
Why was sinhalite mistaken for peridot?
Sri Lankan sinhalite can have greenish or brownish colors that resemble peridot in a quick visual inspection. It was identified as a distinct mineral in 1952 after earlier specimens had been treated as peridot. [International Gem Society](https://www.gemsociety.org/article/sinhalite-jewelry-and-gemstone-information/)
Does sinhalite show pleochroism?
Yes. A cut sinhalite can show different green and brown tones as the viewing direction changes because it is pleochroic.
Where is gem-quality sinhalite found?
Sri Lanka is the best-known source of gem-quality sinhalite, often from alluvial gem gravels. Smaller occurrences are also reported in places including Tanzania and Myanmar.
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