Ferruginous Quartz

Physical Properties

Hardness: 7 on the Mohs scale. Color: White to milky with orange, brown, and reddish staining. Luster: Vitreous to greasy. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Formation & Geological History

Formed through hydrothermal processes where silica-rich fluids crystallize in veins or pockets. The distinctive coloring comes from the infiltration of iron-bearing minerals like hematite or limonite into cracks or as inclusions during or after growth.

Uses & Applications

Primarily used for landscape decoration, as garden stones, or as a collector's specimen for mineral hobbyists. High-purity quartz is used in glassmaking and electronics.

Geological Facts

This type of quartz is often called 'Iron Quartz' or 'Golden Healer' in metaphysical circles. The rusty appearance is not surface dirt but is often trapped within the micro-cracks of the crystal structure.

Field Identification & Locations

Identify in the field by its ability to scratch glass and its lack of cleavage. Look for the characteristic glassy luster hidden beneath the iron-oxide staining. Common globally in igneous and metamorphic terrains.

Identified on: 4/21/2026

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