mineral
Hematite-coated Quartz Cluster
Silicon dioxide with iron oxide coating (SiO2 + Fe2O3)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, hexagonal crystal system, and a distinctive reddish-orange to brown surface coating over translucent crystals.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, hexagonal crystal system, and a distinctive reddish-orange to brown surface coating over translucent crystals.
Formation & geological history
Formed in hydrothermal veins or cavity fillings where silica-rich solutions crystallized, later exposed to iron-rich groundwater that deposited hematite on the surfaces.
Uses & applications
Popular among mineral collectors for display and lapidary art; quartz is also widely used in electronics and manufacturing.
Geological facts
The vibrant red coating is often referred to as 'fire quartz' or 'hematoid quartz,' highly prized for its striking color contrast.
Field identification & locations
Easily identified by its crystal shape combined with powdery or crusty red iron oxide staining. Found globally, notably in Brazil, Madagascar, and the US.
