metamorphic

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)

AI-generated identification · may be incorrect

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

Identified March 4, 2026More metamorphic →

Explore Diamond Drill Core (Greenschist and Quartzite) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

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.