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2. Filler (materials) - Wikipedia

   en.wikipedia.org/wiki/Filler_(materials)

   Referred to as "chalk" in the plastic industry, calcium carbonate is derived from limestone and marble. ... 5.5-6 4-30 2-10 Disc Magnetite/Hematite 5.2 5.5-6 1-50 ~1 ...

3. Gesso - Wikipedia

   en.wikipedia.org/wiki/Gesso

   Gesso is traditionally a mix of an animal glue binder (usually rabbit-skin glue), chalk, and white pigment. For priming flexible canvas, an emulsion of gesso and linseed oil, also called "half-chalk ground", is used. [4] Acrylic gesso is a mixture of white pigment and some kind of filler (chalk, silica, etc.) and acrylic resin dispersed in water.

4. Gypsum - Wikipedia

   en.wikipedia.org/wiki/Gypsum

   Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. [4] It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk.

5. Calcium sulfate - Wikipedia

   en.wikipedia.org/wiki/Calcium_sulfate

   so 2 + 0.5 o 2 + caco 3 → caso 4 + co 2 Related sulfur-trapping methods use lime and some produces an impure calcium sulfite , which oxidizes on storage to calcium sulfate. In the production of phosphoric acid from phosphate rock , calcium phosphate is treated with sulfuric acid and calcium sulfate precipitates.

6. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Chalk - Wikipedia

   en.wikipedia.org/wiki/Chalk

   [1] [2] It is composed mostly of tiny fragments of the calcite shells or skeletons of plankton, such as foraminifera or coccolithophores. [1] These fragments mostly take the form of calcite plates ranging from 0.5 to 4 microns in size, though about 10% to 25% of a typical chalk is composed of fragments that are 10 to 100 microns in size.