mineral

Hematoid Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs); Color: Translucent white to milky with reddish-brown inclusions; Luster: Vitreous (glassy); Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 (Mohs)
Color: Translucent white to milky with reddish-brown inclusions
Luster: Vitreous (glassy)

Identified July 4, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs); Color: Translucent white to milky with reddish-brown inclusions; Luster: Vitreous (glassy); Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed when iron oxides (hematite or goethite) are trapped as inclusions or coat the surface during the crystal growth of quartz in hydrothermal veins or sedimentary environments.

Uses & applications

Used primarily for ornamental purposes, jewelry, lapidary training, and as a popular metaphysical or collectors' stone.

Geological facts

Also known as 'Fire Quartz' or 'Harlequin Quartz,' the red color is not a dye but a natural result of oxidized iron. It is a common find in river beds and alluvial deposits.

Field identification & locations

Identified by the distinct red or orange staining within a crystal that cannot be scratched away. It is widely collected and found in many locations, especially Madagascar and Brazil.