Mineral

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with iron oxide inclusions/staining (Limonite/Hematite)

Hardness: 7 on Mohs scale; Color: Grayish-white with yellow, orange, and brown rust-like staining; Luster: Vitreous (glassy) to dull where weathered; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Luster: Vitreous (glassy) to dull where weathered

Identified March 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes or within geodes. The iron staining occurs when groundwater rich in iron minerals (like limonite) permeates cracks or coats the surface of the quartz over thousands of years.

Uses & applications

Primary use is for mineral collecting. High-purity quartz is used in electronics and glass-making, while aesthetically pleasing stained quartz is often used in jewelry as 'Sun Quartz' or 'Golden Healer' in metaphysical circles.

Geological facts

Iron-stained quartz is frequently mistaken for gold by novice prospectors due to the yellowish-orange tint, though quartz is much harder and lacks the malleability of gold. It is one of the most common mineral variations found on Earth's crust.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and its resistance to weathering. Common in riverbeds, glacial till, and mountainous outcroppings. Collectors should look for unique banding or internal 'rainbows' caused by fractures.

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