metamorphic

Quartzite with Schist Inclusions

Metamorphosed Quartzite (SiO2) with minor mica/chlorite schist

AI-generated identification · may be incorrect

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 June 28, 2026More metamorphic →

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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.