Chalk
Chalk is soft, fine-grained, easily pulverized, white-to-grayish variety of limestone. Chalk is composed of the shells of such minute marine organisms as foraminifera, coccoliths, and rhabdoliths. The purest varieties contain up to 99 percent calcium carbonate in the form of the mineral calcite.

Raw Material
The major raw materials required for chalk is gypsum .

Types of Chalk
  • Colored Chalk
  • White Chalk
Chalk Uses
  • Blackboard Chalk is a substance used for drawing on rough surfaces, as it readily crumbles leaving particles that stick loosely to these surfaces. Although traditionally composed of natural chalk, modern blackboard chalk is generally made from the mineral gypsum (calcium sulfate), often supplied in sticks of compressed powder about 10 cm long.
  • In lawn tennis, powdered chalk was used to mark the boundary lines of the court.
  • In gymnastics, rock-climbing, billiards, bouldering, weight-lifting and tug of war, chalk—now usually magnesium carbonate—is applied to the hands to prevent slipping.
  • Tailor's chalk is traditionally a hard chalk used to make temporary markings on cloth, mainly by tailors. Nowadays it is usually made from talc (magnesium silicate).
  • Sidewalk chalk is made of sticks of colored chalk (now mostly gypsum) used to draw on sidewalks, streets, and driveways. It is often done by children, but in many cities, talented adult artists create masterpieces on the walkways.
Chalk holders are used to hold chalk whilst writing on a blackboard and also to hold chalk for snooker players who regularly chalk the end of their cue. Chalk holders can keep your hands clean whilst using a piece of chalk for writing and another variation will store your chalk until you next intend to use it.

Types of Chalk Holders
There are several types of Chalk Holders for many different applications. The most common types are as follows:
Chalk Holders to suit Snooker, Pool, Billiard Cue Chalk
  • Rubber Chalk Holder - To suit snooker cue chalk
  • Vinyl Chalk Holder - To suit 8-ball cue chalk
  • Leather Pocket Chalk Holder - To suit pool cue chalk
  • Magnetic Chalk Holder - To suit Billiard cue chalk
  • Wooden Chalk Holder - To suit any cue chalk, compliments your table
  • Brass Chalk Holder - Premium looking cue chalk holder to suit any professional chalker
Chalk Holders to suit Chalkboard /Blackboard Chalk
  • Alumunium Chalk Holder Pen - To suit 4mm to 8mm board chalk
  • Plastic Chalk Holder Pen - To suit 4mm to 8mm board chalk
  • Alumunium Chalk Holder Rail - Attaches to wall or board to hold chalk and board duster
Chalk Holders to suit Gymnasium Chalk
  • Block Chalk Holder - Suits magnesium carbonate block chalk
  • Powdered Gym Chalk Holder - To suit any powered gymnasium chalk, on tripod pedestal base
Chalk Holders to suit Rock Climbing
  • Powered Chalk Holder Bags - Suits rock climbing
  • Chalk Bags - To suit climbing gear, solid climbing chalk