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Demantoid

Specimen cases holding small mineral samples on a reference tray, viewed from above.

Properties

Property table of the Wikipedia article “Demantoid”, reprinted as recorded in the fetch.
CategoryMinerals
FormulaCa3Fe2Si3O12
Crystal systemcubic
Colorlight to deep green
Mohs scale hardness6.5–7.0
Lusteradamantine
Specific gravity3.84

From the Wikipedia article

Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals. Andradite is a calcium- and iron-rich garnet. The chemical formula is Ca3Fe2(SiO4)3 with chromium substitution as the cause of the demantoid green color. Ferric iron is the cause of the yellow in the stone.

Source

Source record: crystal-compendium/demantoid/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.

https://en.wikipedia.org/wiki/Demantoid — revision id 1373069007. Text and properties from Wikipedia, licensed CC BY-SA 4.0.