mineral
Smoky Quartz with Hematite Inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness: 7 on Mohs scale. Color: Translucent smoky brown-grey with red/orange inclusions. Luster: Vitreous. Crystal System: Hexagonal/Trigonal prism. Cleavage: Indistinct/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Translucent smoky brown-grey with red/orange inclusions
- Luster
- Vitreous
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Physical properties
Hardness: 7 on Mohs scale. Color: Translucent smoky brown-grey with red/orange inclusions. Luster: Vitreous. Crystal System: Hexagonal/Trigonal prism. Cleavage: Indistinct/Conchoidal fracture.
Formation & geological history
Formed in igneous or metamorphic environments through the crystallization of silica-rich hydrothermal fluids. The smoky color is caused by natural radiation in the surrounding rock, while the red color comes from iron oxide inclusions deposited during growth.
Uses & applications
Used primarily in jewelry, as a healing crystal in metaphysical practices, and as a collector's specimen. Smoky quartz is also used in the manufacture of precision glass and sensors.
Geological facts
The red 'phantom' or included areas are often referred to as lepidocrocite or hematite inclusions. These inclusions can form beautiful internal 'ghosts' that map out the crystal's previous growth stages.
Field identification & locations
Identified by its hexagonal crystal shape, lack of cleavage, and the ability to scratch glass. Widely found in Brazil, Madagascar, and the Swiss Alps. For collectors, look for clarity and distinct inclusion patterns.
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