CLASS: Nesosilicate. . . CHEMICAL FORMULA: Al2 SiO4 (F, OH) 2. . . CRYSTAL SYSTEM: rhombic
CRYSTAL FORM: prism
COLOR: colorless, yellow, blue, green, purple and reddish yellow.
PHYSICAL PROPERTIES: very hard (8 Mohs), heavy (3,49 g/cm3), perfect basal cleavage, transparent / translucent, glassy shine, insoluble and infusible.
CURIOSITIES: related to the enhancement of self-confidence
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