metamorphic
Garnet in Quartz
Garnet-bearing Quartzite
AI-generated identification · may be incorrectHardness 7-7.5 (quartz matrix) and 6.5-7.5 (garnet), color white to grey with deep red or brown garnet crystals, vitreous luster, conchoidal fracture.
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Physical properties
Hardness 7-7.5 (quartz matrix) and 6.5-7.5 (garnet), color white to grey with deep red or brown garnet crystals, vitreous luster, conchoidal fracture.
Formation & geological history
Formed through regional metamorphism of silica-rich sandstone and argillaceous sediments under high temperature and pressure, typically during mountain-building events.
Uses & applications
Used primarily as mineral specimens for rock and crystal collectors, and occasionally cut into cabochons for jewelry.
Geological facts
The distinct contrast between the dark red garnet porphyroblasts and the light quartz matrix makes this a classic textbook example of metamorphic textures.
Field identification & locations
Identify in the field by searching for rounded or euhedral dark red crystals embedded within a hard, glassy quartz matrix that does not effervesce with acid.
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