mineral
Specularite in Quartz
Specular Hematite (Fe2O3) in Quartz (SiO2)
Hardness: 5-6 (Specularite), 7 (Quartz). Color: Silver-black metallic with iridescent blue highlights on white/clear matrix. Luster: Metallic to vitreous. Crystal structure: Hexagonal/Trigonal.
- Hardness
- 5-6 (Specularite), 7 (Quartz)
- Luster
- Metallic to vitreous
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Physical properties
Hardness: 5-6 (Specularite), 7 (Quartz). Color: Silver-black metallic with iridescent blue highlights on white/clear matrix. Luster: Metallic to vitreous. Crystal structure: Hexagonal/Trigonal.
Formation & geological history
Formed in hydrothermal veins or through metamorphism of iron-rich sedimentary rocks. The specular hematite occurs as plate-like micaceous crystals embedded within quartz grains.
Uses & applications
Primarily collected as mineral specimens; specularite is also a minor iron ore and sometimes used in cosmetics or as decor.
Geological facts
The name 'specularite' comes from the Latin 'speculum' (mirror) because the flat metallic crystals are highly reflective and were used as early mirrors.
Field identification & locations
Identified by its distinctive metallic 'glitter' or flake-like appearance and the red-brown streak it leaves on a porcelain plate. Common in Iron Range regions like Michigan or Brazil.
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