mineral side of metamorphic/igneous sources
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 7 on Mohs scale; Color: Orange, yellow, or rusty brown; Luster: Vitreous to waxy; Crystal Structure: Trigonal (often massive in river-worn samples); Cleavage: None/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Orange, yellow, or rusty brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Orange, yellow, or rusty brown; Luster: Vitreous to waxy; Crystal Structure: Trigonal (often massive in river-worn samples); Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed via hydrothermal activity or as a primary mineral in igneous and metamorphic rocks. The orange coloration is due to the presence of iron oxide (hematite or limonite) staining within the quartz structure or on its surface. Exposed by erosion and often rounded by water transport.
Uses & applications
Used primarily as a collector's specimen, in lapidary work (cabs or tumbling), and sometimes in decorative landscaping or as a metaphysical stone. High-purity quartz is used in glassmaking and electronics.
Geological facts
This specimen is often called 'River Quartz' or 'Iron Quartz'. It is one of the most common materials found in riverbeds and glacial tills because quartz is highly resistant to both physical and chemical weathering.
Field identification & locations
Identify in the field by its hardness (will scratch glass), its translucency when held to light, and its lack of cleavage planes. Found globally in almost any environment where erosion occurs.
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