mineral
Orange Quartz (Ferruginous Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 7 (Mohs scale); Color: Oranges, browns, and tans; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Oranges, browns, and tans
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: Oranges, browns, and tans; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None; Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins or igneous environments where silica-rich fluids crystalize. The orange hue is caused by inclusions of iron oxides like hematite or goethite. These can range from Precambrian to recent geological ages.
Uses & applications
Used primarily for lapidary work such as tumbling and cabochons, as well as chakra healing and metaphysical collecting.
Geological facts
Orange quartz is often mistaken for carnelian, but carnelian is a microcrystalline chalcedony, whereas this specimen shows the macrocrystalline structure of quartz. Iron-stained quartz is one of the most common mineral varieties on Earth.
Field identification & locations
Identify in the field by its hardness (will scratch glass) and lack of cleavage. It is commonly found in gravel pits, riverbeds, and mountainous regions worldwide.
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