metamorphic
Quartzite with Schist Inclusions
Metamorphosed Quartzite (SiO2) with minor mica/chlorite schist
Hardness: 7 (Mohs scale), Color: White to light grey with dark grey-green streaks, Luster: Vitreous to dull, Crystal structure: Granular/Microcrystalline, Specific gravity: 2.6-2.7
Identified More metamorphic →
Explore Quartzite with Schist Inclusions in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs scale), Color: White to light grey with dark grey-green streaks, Luster: Vitreous to dull, Crystal structure: Granular/Microcrystalline, Specific gravity: 2.6-2.7
Formation & geological history
Formed from the intense heating and pressure applied to quartz-rich sandstone (protolith) during regional metamorphism. The dark streaks represent original clay-rich layers that have metamorphosed into schistose minerals.
Uses & applications
Primarily used as decorative stone, crushed stone for road construction, and ballast. High-quality pieces are used for architectural surfacing.
Geological facts
Quartzite is so tough that it often survives intense glacial transport and water erosion better than any other rock type; it is chemically stable and physically durable.
Field identification & locations
Identified by its ability to scratch glass and its granular, sugary texture. Often found in riverbeds or glacial till where softer rocks have eroded away.
More like this
