metamorphic
Quartzite (with Mica / Quartzite Schist)
SiO2 (Silica) with minor Muscovite Mica KAl2(AlSi3O10)(OH)2
Hardness: 7 (Quartz) to 2.5-3 (Mica); Color: Light tan, brown, beige with sparkling white quartz patches; Luster: Vitreous to pearly/glimmering due to mica flakes; Structure: Granoblastic/interlocking crystalline grains
- Hardness
- 7 (Quartz) to 2
- Color
- Light tan, brown, beige with sparkling white quartz patches
- Luster
- Vitreous to pearly/glimmering due to mica flakes
Identified More metamorphic →
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Physical properties
Hardness: 7 (Quartz) to 2.5-3 (Mica); Color: Light tan, brown, beige with sparkling white quartz patches; Luster: Vitreous to pearly/glimmering due to mica flakes; Structure: Granoblastic/interlocking crystalline grains
Formation & geological history
Formed via regional metamorphism of quartz-rich sandstone under intense heat and pressure, often incorporating clay or mica-rich layers during recrystallization.
Uses & applications
Used as construction aggregate, decorative landscaping stone, dimension stone, and raw material for silica manufacturing.
Geological facts
The shimmering or sparkling surface is caused by fine grains of mica embedded within the hard, interlocking quartz matrix. It is highly resistant to chemical and physical weathering.
Field identification & locations
Identified by its granular, sugary texture combined with bright sparkling reflective specs (mica) and high scratch hardness where quartz dominates. Commonly found in mountainous metamorphic terrains worldwide.
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