metamorphic
Quartz-rich metamorphic rock, likely mica schist or quartzite
Quartz (SiO₂) with probable mica, feldspar, and dark accessory minerals
AI-generated identification · may be incorrectOff-white, coarse-grained specimen with glassy to pearly luster and visible dark green-black grains; quartz hardness is 7 Mohs, while mica is 2–3. The irregular texture suggests interlocking recrystallized minerals and possible schistosity, though the image is insufficient for precise identification.
Identified More metamorphic →
Explore Quartz-rich metamorphic rock, likely mica schist or quartzite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Off-white, coarse-grained specimen with glassy to pearly luster and visible dark green-black grains; quartz hardness is 7 Mohs, while mica is 2–3. The irregular texture suggests interlocking recrystallized minerals and possible schistosity, though the image is insufficient for precise identification.
Formation & geological history
Likely formed when a quartz-rich sedimentary protolith was buried, heated, and compressed during regional metamorphism, commonly during mountain building. Its exact geological age cannot be determined visually.
Uses & applications
Used primarily as a teaching or collection specimen; quartzite can serve as durable building stone and aggregate, while mica-bearing schist is generally decorative or architectural rather than industrial.
Geological facts
Quartz-rich metamorphic rocks may contain muscovite, biotite, chlorite, or amphibole, producing the dark patches visible here. A white streak and hardness test can help distinguish quartz from softer carbonate minerals.
Field identification & locations
Common in metamorphic mountain belts worldwide, including the Appalachians, Rockies, Alps, and Himalaya. Look for hard quartz grains, foliation or banding, and mica flakes; a definitive name requires a fresh surface and tests.
More like this
