metamorphic
Quartz with Chlorite / Greenschist
Quartz vein in Greenschist (SiO2 with Chlorite group minerals)
Hardness: 6.0-7.0 on Mohs scale (quartz areas 7, chlorite areas softer 2-3). Color: Milky white to translucent grayish-white quartz intergrown with dark greenish-gray to forest green chlorite. Luster: Vitreous to greasy on quartz surfaces, dull to sub-pearly on chloritic matrix. Specific gravity: approx. 2.65-2.8.
- Hardness
- 6
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Physical properties
Hardness: 6.0-7.0 on Mohs scale (quartz areas 7, chlorite areas softer 2-3). Color: Milky white to translucent grayish-white quartz intergrown with dark greenish-gray to forest green chlorite. Luster: Vitreous to greasy on quartz surfaces, dull to sub-pearly on chloritic matrix. Specific gravity: approx. 2.65-2.8.
Formation & geological history
Formed via low-grade regional metamorphism (greenschist facies) under moderate temperatures and pressures, where hydrothermal fluids rich in silica intruded host rocks, depositing vein quartz alongside chlorite minerals.
Uses & applications
Primarily used as a decorative landscaping stone, educational geological specimen, or raw material for mineral collectors. High-purity quartz veins are sometimes mined for industrial silica.
Geological facts
Greenschist facies rocks get their characteristic green color from minerals like chlorite, epidote, and actinolite. Hydrothermal quartz veins within greenschist are often target zones for gold prospecting, as quartz-chlorite systems frequently host metallic sulfide and precious metal deposits.
Field identification & locations
Look for contrasting milky-white quartz mixed with soft, dark green mineral masses. The quartz will easily scratch glass, whereas the green chloritic areas are much softer. Common along riverbeds, glacial tills, and metamorphic mountain ranges worldwide.
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