metamorphic
Mica-rich rock, likely muscovite-bearing schist or pegmatite
Muscovite (KAl₂(AlSi₃O₁₀)(OH)₂), with possible quartz and feldspar; host rock uncertain
AI-generated identification · may be incorrectPale silvery-gold, strongly reflective sheets suggest mica with perfect basal cleavage. Muscovite is Mohs 2–2.5, with a vitreous-to-pearly luster and monoclinic crystal structure; the photo does not establish the specimen’s full mineral composition.
Identified More metamorphic →
Explore Mica-rich rock, likely muscovite-bearing schist or pegmatite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Pale silvery-gold, strongly reflective sheets suggest mica with perfect basal cleavage. Muscovite is Mohs 2–2.5, with a vitreous-to-pearly luster and monoclinic crystal structure; the photo does not establish the specimen’s full mineral composition.
Formation & geological history
Mica commonly forms in granitic pegmatites and during metamorphism of clay-rich rocks. These processes span a wide range of geological ages; the specimen’s age and exact host cannot be determined from the image.
Uses & applications
Muscovite is used in electrical and thermal insulation, fillers, and cosmetics; attractive specimens are collected, but this piece appears to be a small, common sample.
Geological facts
Mica splits into thin, flexible sheets, a useful diagnostic property. Its reflective flakes can resemble metallic gold, but mica is not gold.
Field identification & locations
Look for flat, flaky layers that peel into sheets and a pale streak; quartz or feldspar may occur alongside it. Mica-bearing rocks occur worldwide, especially in granitic and metamorphic terrains.
More like this
