metamorphic
Diamond Drill Core (Greenschist and Quartzite)
Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)
Hardness: 3-5 (Schist) to 7 (Quartzite); Color: Dark forest green to silvery grey; Luster: Pearly to vitreous; Structure: Foliated schistose texture and crystalline granular; Density: 2.6-3.0 g/cm3.
- Hardness
- 3-5 (Schist) to 7 (Quartzite)
- Color
- Dark forest green to silvery grey
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 3-5 (Schist) to 7 (Quartzite); Color: Dark forest green to silvery grey; Luster: Pearly to vitreous; Structure: Foliated schistose texture and crystalline granular; Density: 2.6-3.0 g/cm3.
Formation & geological history
Formed through regional metamorphism of basaltic or sedimentary protoliths under low-to-medium temperature and pressure (greenschist facies). These samples are retrieved via diamond core drilling from deep lithological layers.
Uses & applications
Used primarily for geological mapping, mineral exploration, and geotechnical site assessment for mining or large-scale construction projects.
Geological facts
The cylindrical shape is the result of a hollow diamond-tipped drill bit cutting through solid bedrock. The 'greenschist' facies is a major indicator of plate tectonic history and ancient mountain-building events.
Field identification & locations
Identified by the distinct cylindrical shape and visible foliation or mineral layering. Found at mining exploration sites and geotechnical survey labs. Look for chlorite (green) and quartz (white/grey) bands.
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