metamorphic
Quartz-veined metamorphic rock, likely mica schist
Mica schist with a milky-quartz vein; predominantly quartz, feldspar, and biotite/muscovite mica
AI-generated identification · may be incorrectDark, foliated, sparkly matrix with a coarse white quartz vein. Quartz has Mohs hardness 7, vitreous luster, no cleavage; mica has perfect basal cleavage and causes the flaky texture. Specific gravity is roughly 2.7–2.8.
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Physical properties
Dark, foliated, sparkly matrix with a coarse white quartz vein. Quartz has Mohs hardness 7, vitreous luster, no cleavage; mica has perfect basal cleavage and causes the flaky texture. Specific gravity is roughly 2.7–2.8.
Formation & geological history
Formed when shale or another clay-rich sediment was buried, heated, and compressed during regional metamorphism; the quartz vein formed later when silica-rich fluids filled a fracture. Exact geological age cannot be determined from the photograph.
Uses & applications
Used locally as decorative stone, wall or landscaping material, and educational specimens; attractive pieces may be collected, but it is generally not a jewelry gemstone or major building stone.
Geological facts
The strong planar fabric is schistosity, produced by aligned mica crystals. The contrasting vein is likely hydrothermal quartz rather than a separate sedimentary layer.
Field identification & locations
Identify it by splitting along shiny mica-rich foliation and observing the hard, pale quartz vein that scratches glass. Common in regional metamorphic belts worldwide, including the Appalachians, New England, Colorado, and parts of Europe and Asia.
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