mineral

Ferruginous Quartz (Stained Quartz)

Silicon Dioxide (SiO2) with secondary Iron Oxide inclusions (Limonite/Hematite)

Hardness: 7 (Mohs scale); Color: Translucent white with yellow-orange to brown staining; Luster: Vitreous/glassy; Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Translucent white with yellow-orange to brown staining
Luster: Vitreous/glassy

Identified March 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through crystallization of silica-rich hydrothermal fluids. The yellow-orange tint is a result of secondary iron oxide staining or surface oxidation of iron minerals within groundwater over long periods (Pleistocene to Holocene ages).

Uses & applications

Primary uses are decorative, such as landscape gravel, aquarium pebbles, or tumble-polishing for novice gem collectors. Higher grade quartz is used in semiconductor and glass manufacturing.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. The yellow staining in this piece is often called 'golden healer' in metaphysical circles, though geologically it is simply iron contamination.

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage planes. Commonly found in riverbeds, glacial till, and coastal areas as water-worn pebbles. Collectors look for pieces with interesting internal fractures or intense color patterns.

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