mineral

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Hardness: 7 on Mohs scale; Color: Rusty red, orange, or brown with white/clear areas; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Rusty red, orange, or brown with white/clear areas
Luster: Vitreous (glassy) to greasy

Identified April 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids where iron oxides like hematite or goethite are present, staining the quartz during or after crystallization. Often found in vein deposits or weathered riverbeds.

Uses & applications

Mainly used as a collector specimen, in lapidary work (cabochons), or as decorative 'healing crystals' in metaphysical markets.

Geological facts

The reddish-brown color is caused by microscopic particles of iron oxide trapped within the crystal lattice or along fractures. It is commonly referred to in the trade as 'Hematoid Quartz' or 'Fire Quartz'.

Field identification & locations

Identify in the field by its high hardness (cannot be scratched by a steel knife) and its distinct waxy-to-glassy luster despite the iron staining. Commonly found in river gravels or areas with volcanic activity.

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Mineral/Rock

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Metamorphic Rock

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mineral