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Euclase
- Translations : Euklas, Euclasit, Euclasita, Эвклаз, ユークレイス
- Synonym : Euclasite
- Etymology : From the Greek "eu" = well and "klastos" = breeze, due to its easy cleavage.
- Discovery: 1792 by Rene Just Haüy
- Type localityOuro Preto, Iron Quadrangle, Minas Gerais, Brazil
Gemological data
- Chemical formula : BeAlSiO4(OH)
- Hardness (Mohs) : 7.5
- Density : 2.93 - 3.1
- Refractive index : nα = 1.652 nβ = 1.655 nγ = 1.671
- Birefingence : 0.019
- Crystal system : Monoclinique
- Mineralogical Class : Nesosilcates
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