metamorphic
Quartz-bearing metamorphic rock, likely garnet-mica schist
Quartz–mica schist with probable garnet and iron-oxide minerals
AI-generated identification · may be incorrectVisible white quartz veins occur in a dark, foliated matrix with reddish-brown mica or iron oxides and possible garnet; quartz hardness is 7, while mica is 2–3. Luster ranges vitreous on quartz to pearly/metallic on reflective mica; foliation and irregular veining are prominent.
Identified More metamorphic →
Explore Quartz-bearing metamorphic rock, likely garnet-mica schist in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Visible white quartz veins occur in a dark, foliated matrix with reddish-brown mica or iron oxides and possible garnet; quartz hardness is 7, while mica is 2–3. Luster ranges vitreous on quartz to pearly/metallic on reflective mica; foliation and irregular veining are prominent.
Formation & geological history
Formed when preexisting sedimentary or igneous rock was subjected to regional metamorphism, producing aligned mica and recrystallized quartz; the specimen may be Paleozoic or older, but age cannot be determined from the image. Quartz veins formed when hot, silica-rich fluids filled fractures during or after metamorphism.
Uses & applications
Primarily a collector specimen or field-geology sample; similar schists can be used as decorative stone, while quartz-rich material may be crushed for aggregate. It is generally unsuitable for high-grade jewelry unless attractive garnet or unusual metallic minerals are present.
Geological facts
The rusty red coloration commonly reflects oxidation of iron-bearing minerals such as biotite, garnet, or sulfides. A fresh broken surface should reveal interlocking grains and planar mica alignment rather than sedimentary layering.
Field identification & locations
Look for foliation, sparkly platy mica, hard glassy quartz veins, and a streak that is usually pale or colorless for quartz; a hand lens and hardness test help confirm it. Common in regional metamorphic belts worldwide, including the Appalachians, Alps, and Precambrian shields.
More like this
