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Unpolished Chalk Rock Stone Stock Photo - Download Image Now - Chalk - Rock, Calcium Carbonate, Mineral - iStock
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Amazon.com: EISCO Raw Limestone Chalk, Sedimentary Rock Specimen - Approx. 1" - Geologist Selected & Hand Processed - Great for Science Classrooms Labs : Industrial & Scientific
![Chalk is a soft, friable and porous variety of limestone. Chalk is composed of calcareous tests of marine microo… | Rock types, Rocks and minerals, Rock and pebbles Chalk is a soft, friable and porous variety of limestone. Chalk is composed of calcareous tests of marine microo… | Rock types, Rocks and minerals, Rock and pebbles](https://i.pinimg.com/originals/ba/ee/57/baee577bf1fa1cf64b35e6c60f47dc2c.jpg)