Bloodstone is a chert-like rock that is composed of cryptocrystalline quartz. It consists of a mix of deep green and deep red quartz. By itself, deep green cr — Photo: James St. John · CC BY 2.0
Heliotrope
Also known as: Bloodstone.
Bloodstone — the dark-green chalcedony flecked with red jasper, one of the oldest gem materials.
Intro adapted from Wikipedia (CC BY-SA).
Heliotrope is a mineral variety of Quartz, with the chemical formula SiO₂.
It crystallizes in the trigonal crystal system.
Key properties: Mohs hardness 7; typically green or red.
Collections: Gemstones.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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