mineral

Ferruginous Quartz (Hematoid Quartz)

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Hardness: 7 (Mohs scale); Color: Clear to translucent with streaks of red, orange, or yellow; Luster: Vitreous (glassy); Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Clear to translucent with streaks of red, orange, or yellow
Luster: Vitreous (glassy)

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silicon dioxide-rich fluids crystallize. The distinct colors are created by iron oxide (Hematite or Limonite) leaching into the quartz during or after the crystallization process. Found in pegmatites and hydrothermal veins.

Uses & applications

Primarily used for ornamental purposes, lapidary art (carvings like hearts or spheres), jewelry cabochons, and as a popular specimen for crystal collecting and metaphysical practices.

Geological facts

Also known as 'Fire Quartz' or 'Golden Healer' in the trade. The inclusions are literally 'rust' trapped inside the quartz crystal, creating a natural paint-like effect within the mineral.

Field identification & locations

Identify by its hardness (cannot be scratched by a steel knife) and the internal wispy, metallic-looking red or yellow staining. Commonly found in Madagascar, Brazil, and Spain. Collectors look for high clarity quartz with vibrant, well-distributed iron patterns.

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