![Chalk is a soft, white, porous sedimentary rock, a form of #limestone composed of the mineral calcite. #Calcite is calcium ca… | Limestone rock, Chalk, Sedimentary Chalk is a soft, white, porous sedimentary rock, a form of #limestone composed of the mineral calcite. #Calcite is calcium ca… | Limestone rock, Chalk, Sedimentary](https://i.pinimg.com/736x/22/04/d9/2204d99f3163c135b63061efb48252f1.jpg)
Chalk is a soft, white, porous sedimentary rock, a form of #limestone composed of the mineral calcite. #Calcite is calcium ca… | Limestone rock, Chalk, Sedimentary
![Rare and Hard to Find Art Supplies | Calcite (Chalk)—Types, History and Use in Oil Painting | Pigments, Oil Paint, Watercolors, Cold Wax Rare and Hard to Find Art Supplies | Calcite (Chalk)—Types, History and Use in Oil Painting | Pigments, Oil Paint, Watercolors, Cold Wax](https://www.naturalpigments.eu/media/magefan_blog/coccoliths_6500x.jpg)
Rare and Hard to Find Art Supplies | Calcite (Chalk)—Types, History and Use in Oil Painting | Pigments, Oil Paint, Watercolors, Cold Wax
![Rare and Hard to Find Art Supplies | Calcite (Chalk)—Types, History and Use in Oil Painting | Pigments, Oil Paint, Watercolors, Cold Wax Rare and Hard to Find Art Supplies | Calcite (Chalk)—Types, History and Use in Oil Painting | Pigments, Oil Paint, Watercolors, Cold Wax](https://www.naturalpigments.eu/media/wysiwyg/blog/calcite_particles.jpg)
Rare and Hard to Find Art Supplies | Calcite (Chalk)—Types, History and Use in Oil Painting | Pigments, Oil Paint, Watercolors, Cold Wax
![Natural chalk stones background. Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite. Rock forms from the ooze. Mining concept Stock Photo Natural chalk stones background. Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite. Rock forms from the ooze. Mining concept Stock Photo](https://as2.ftcdn.net/v2/jpg/03/27/36/11/1000_F_327361134_hTsLVMsFd0J74Brl9juCjl3xcEMD53Vd.jpg)
Natural chalk stones background. Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite. Rock forms from the ooze. Mining concept Stock Photo
![Coccolithophore cells covered with calcium carbonate (chalk) scales. Progress in understanding the unique physiology of these globally important organisms will help us to understand how they may respond to changing ocean chemistry. Coccolithophore cells covered with calcium carbonate (chalk) scales. Progress in understanding the unique physiology of these globally important organisms will help us to understand how they may respond to changing ocean chemistry.](https://s3-eu-west-1.amazonaws.com/ppreviews-plos-725668748/1549564/preview.jpg)
Coccolithophore cells covered with calcium carbonate (chalk) scales. Progress in understanding the unique physiology of these globally important organisms will help us to understand how they may respond to changing ocean chemistry.
![File:Calcite variety Chalk Calcium carbonate Barton Lime ounty Bedfordshire England 2597.jpg - Wikimedia Commons File:Calcite variety Chalk Calcium carbonate Barton Lime ounty Bedfordshire England 2597.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/d/df/Calcite_variety_Chalk_Calcium_carbonate_Barton_Lime_ounty_Bedfordshire_England_2597.jpg)
File:Calcite variety Chalk Calcium carbonate Barton Lime ounty Bedfordshire England 2597.jpg - Wikimedia Commons
![Mineral stone - calcite. A white or colorless mineral consisting of calcium carbonate. It is a major constituent of sedimentary rocks such as limestone, marble, chalk, can occur in crystalline form. Stock Mineral stone - calcite. A white or colorless mineral consisting of calcium carbonate. It is a major constituent of sedimentary rocks such as limestone, marble, chalk, can occur in crystalline form. Stock](https://as1.ftcdn.net/v2/jpg/00/99/60/08/1000_F_99600834_qa0jAwpAt6FhewTzBi6hgtJLbXr05Ufl.jpg)
Mineral stone - calcite. A white or colorless mineral consisting of calcium carbonate. It is a major constituent of sedimentary rocks such as limestone, marble, chalk, can occur in crystalline form. Stock
![Natural Chalk Mineral Background. White Calcite Stones. Calcium in Nature Stock Photo - Image of rough, delicate: 219044830 Natural Chalk Mineral Background. White Calcite Stones. Calcium in Nature Stock Photo - Image of rough, delicate: 219044830](https://thumbs.dreamstime.com/z/natural-chalk-mineral-background-white-calcite-stones-calcium-nature-219044830.jpg)