Dimensions: approx. 30 x 40 x 35 mm (LxWxH) Crystal shape: trigonal Hardness: 9 (Mohs scale) Classification: IV/C.04-010 Chemical composition: Aluminium, oxygen
Dimensions: env. 30 x 40 x 35 mm (LxlxH) Forme du cristal: trigonal Dureté: 9 (Échelle de Mohs) Classification: IV/C.04-010 Composition chimique: aluminium, oxygène
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