metamorphic
Rounded mica-rich metamorphic pebble (likely schist)
Mica schist, composed chiefly of quartz and mica (muscovite and/or biotite)
AI-generated identification · may be incorrectGray-green, sparkly, and foliated-looking; mica gives a glinting luster. Typical hardness is about 2–3 for mica and 7 for quartz; exact mineral mix and specific gravity cannot be confirmed from the photo.
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Physical properties
Gray-green, sparkly, and foliated-looking; mica gives a glinting luster. Typical hardness is about 2–3 for mica and 7 for quartz; exact mineral mix and specific gravity cannot be confirmed from the photo.
Formation & geological history
Schist forms when clay-rich sedimentary or volcanic rocks undergo heat and pressure, aligning mica into foliation. Its age cannot be determined visually; schists range from ancient to recent geologic formations.
Uses & applications
Schist is used locally as decorative or landscaping stone and, when sound, as building or paving stone; this small pebble is mainly a display or teaching specimen.
Geological facts
The glitter comes from reflective mica flakes, a hallmark of many schists.
Field identification & locations
The rounded shape suggests transport by a stream, beach, or glacier. Look for aligned, platy mineral grains and a tendency to split along foliation; similar rocks occur in metamorphic terrains worldwide.
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