metamorphic
Quartzite with Chlorite / Epidote Inclusion
Metamorphic Quartzite (SiO2 with chlorite/epidote inclusions)
Hardness: 7 on Mohs scale. Color: Tan, yellowish-brown, and white quartz with dark green to blackish chlorite or epidote patches. Luster: Vitreous to greasy, slightly translucent in lighter areas. Specific gravity: 2.65-2.8.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to greasy, slightly translucent in lighter areas
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Physical properties
Hardness: 7 on Mohs scale. Color: Tan, yellowish-brown, and white quartz with dark green to blackish chlorite or epidote patches. Luster: Vitreous to greasy, slightly translucent in lighter areas. Specific gravity: 2.65-2.8.
Formation & geological history
Formed through regional or contact metamorphism of quartz sandstone under heat and high pressure. The dark green inclusions consist of secondary alteration minerals such as chlorite or epidote formed by hydrothermal activity.
Uses & applications
Primarily used as decorative stone, landscape gravel, aggregate in construction, and as lower-grade lapidary material for tumbling or carving.
Geological facts
Quartzite is extremely resistant to weathering, which causes it to often form ridges and resistant outcrops. Green inclusions like chlorite are often trapped during recrystallization of quartz grains.
Field identification & locations
Can be identified by its grainy yet fused appearance, high hardness (scratches glass), and distinct green blotches of chlorite or epidote. Commonly found in metamorphic terrains, mountain belts, and stream beds worldwide.
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