metamorphic
Schist with Quartz
Mica Schist (contains Muscovite/Biotite and Quartz SiO2)
Hardness varies (2-3 for mica layers, 7 for quartz); Color: Silvery-grey, metallic sheen with white crystalline patches; Luster: Vitreous to pearly; Crystal structure: Foliated (schistose) with hexagonal quartz crystals; Cleavage: Perfect basal in mica layers.
- Color
- Silvery-grey, metallic sheen with white crystalline patches
- Luster
- Vitreous to pearly
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness varies (2-3 for mica layers, 7 for quartz); Color: Silvery-grey, metallic sheen with white crystalline patches; Luster: Vitreous to pearly; Crystal structure: Foliated (schistose) with hexagonal quartz crystals; Cleavage: Perfect basal in mica layers.
Formation & geological history
Formed through the regional metamorphism of shale or sedimentary protoliths under intermediate-to-high pressure and temperature (300-600°C). This specific piece shows a quartz vein or pod within the foliated mica layers.
Uses & applications
Used in ornamental stone masonry, building facades, and as a decorative landscaping stone. Smaller specimens are collected for geological education.
Geological facts
Schist is characterized by its mica flakes which are large enough to be seen with the naked eye, giving it a distinctive 'glittery' appearance. It is a major component of the Earth's continental crust.
Field identification & locations
Identify by its platy, foliated layers that split easily and its characteristic shimmer. Often found in mountain ranges or areas of tectonic uplift. Collectors should look for the alignment of mica grains.
More like this
