heliotrope

Also known as bloodstone

chalcedony variety

Key facts

Category: Tectosilicate minerals
Group: Quartz group
Formula: Si O 2 ( silicon dioxide )
Ima status: Variety of chalcedony
Crystal system: Trigonal ( quartz ), monoclinic ( moganite )
Color: Dark shades of green , often with red or yellow spots; sometimes mixed with whitish silica
Fracture: Conchoidal
Mohs scale hardness: 6.5–7
Luster: Vitreous
Diaphaneity: Opaque to translucent
Refractive index: 1.53–1.54

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Wikidata facts

Image: Quarz - Heliotrop (Blutjaspis).JPG

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Commons category: Heliotrope (mineral)
Mohs' hardness: 6.75
density: 2.610
chemical formula: SiO₂

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Article

Heliotrope (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstone or simply bloodstone), is a mineral aggregate, a cryptocrystalline mixture of quartz that occurs mostly as jasper (opaque) or sometimes as chalcedony (translucent).

The "classic" bloodstone is translucent to opaque green chalcedony and red jasper that contains inclusions of hematite. The red jasper may resemble spots of blood, hence the name bloodstone. Other colors of chalcedony may also occur in Indian bloodstone, such as white, yellow, or blue.