![Amazon.com: EISCO Raw Limestone Chalk, Sedimentary Rock Specimen - Approx. 1" - Geologist Selected & Hand Processed - Great for Science Classrooms Labs : Industrial & Scientific Amazon.com: EISCO Raw Limestone Chalk, Sedimentary Rock Specimen - Approx. 1" - Geologist Selected & Hand Processed - Great for Science Classrooms Labs : Industrial & Scientific](https://m.media-amazon.com/images/I/81+hxSmlXtL.jpg)
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)
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
![Unpolished Chalk Rock Cutout Stock Photo - Download Image Now - Limestone, Part Of, Stone - Object - iStock Unpolished Chalk Rock Cutout Stock Photo - Download Image Now - Limestone, Part Of, Stone - Object - iStock](https://media.istockphoto.com/id/1206022018/photo/unpolished-chalk-rock-cutout.jpg?s=612x612&w=0&k=20&c=TyqLUOmtgeUg_NOQsG1czcpjxparYQfCwTiKRh91M4E=)