metamorphic
Foliated metamorphic rock, likely marble or calc-schist
Calcite-rich marble/calc-schist; predominantly CaCO₃ (calcite), with possible mica and quartz
AI-generated identification · may be incorrectGray-white, fine- to medium-grained, weakly foliated and sugary to dull in luster; likely Mohs 3–4 if calcite-rich. The rounded shape is natural abrasion or weathering, not crystal form; cleavage is not clearly visible. A drop of dilute hydrochloric acid should fizz strongly if calcitic.
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Physical properties
Gray-white, fine- to medium-grained, weakly foliated and sugary to dull in luster; likely Mohs 3–4 if calcite-rich. The rounded shape is natural abrasion or weathering, not crystal form; cleavage is not clearly visible. A drop of dilute hydrochloric acid should fizz strongly if calcitic.
Formation & geological history
Recrystallized limestone or calcareous shale during regional metamorphism, with pressure producing the subtle layered texture. Such rocks commonly formed during Mesozoic–Cenozoic mountain-building; exact age cannot be determined from the photograph.
Uses & applications
Marble is used for tiles, aggregate, monuments, and sculpture; attractive pieces may be polished as decorative stone. An ordinary beach or stream-worn cobble has little commercial value.
Geological facts
The surface texture resembles weathered calcite-rich marble more than a typical igneous rock. The reported location in southern Turkey is geologically plausible because the Taurus region contains abundant metamorphosed carbonate rocks.
Field identification & locations
Likely identification: gray marble or calcareous schist, but visual certainty is moderate. Test streak (white), acid reaction, and hardness: calcite is scratched by a steel knife, while quartz-rich material is not; check for visible mica flakes or thin foliation. Common in Turkish Taurus metamorphic belts and river gravels.
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