A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common limestone.
Finely prepared chalk, used as a drawing implement; also, by extension, a compound, as of clay and black lead, or the like, used in the same manner. See Crayon.
To make white, as with chalk; to make pale; to bleach.
Magnesium carbonate powder that lifters put on their hands to improve the grip.
Limestone that is soft and can be carved for interior use, or pulverized and bound with animal glue in a form of whiting.
calcium carbonate (CaCO3, carbonate of lime, mild calcareous earth). [Lavoisier 1 & 2; Priestley; T. Thomson
A variety of limestone composed of shells of microscopic oceanic organisms.
magnesium carbonate; the same stuff your teacher used for writing on the blackboard, used to counteract sweaty hands and improve grip
a soft, powdery, light-colored limestone that was deposited from sea water.
A sedimentary rock that is a pure-white fine grained variety of limestone.
a valuable viticulture soil because of its good drainage properties, it is a soft, fine-grained, crumbly and porous sediment rock that is present in the Champagne region of France.
a drawing implement derived from various natural sources. Black chalk is obtained from carbonaceous shale, red chalk from the red ochre variety of hematite, and white chalk from the chalk variety of calcite or soapstone. Lumps of these materials were reduced in size and placed in metal holders. The drawing end was shaved to a point. The stone can also be crushed, washed, reformed, and compressed, usually with the addition of a binder. The stroke of black chalk is black or grayish, and is often less intense than that of charcoal. Red chalk, also known as sanguine chalk, is a rusty, brownish-red color. White chalk is mostly used to highlight parts of drawings in other media on colored paper. Two Studies of a Girlâ€™s Head by CÃ©sar-Paul Helleu makes use of all three colored chalks, which was a technique favored by artists of the eighteenth century, notably Watteau, called â€œ aux trois crayons.
Chemical name: Calcium carbonate Chemical formula: CaCO3 See also: Calcium, Chemical Table.
powder that counteracts perspiration for a better grip on a smooth rock
White drying agent used to keep a climbers hands dry. Sometimes called "white courage".
Calcium carbonate, either natural or artificially prepared, finely ground to make the white substance to prepare canvas for painting called gesso. It may be pressed into sticks and used in its white form, or mixed with colored pigments to make pastels.
a soft whitish calcite
a pure flat white with little reflectance
a piece of chalk (or similar substance) used for writing on blackboards or other surfaces
Used by many climbers to improve the friction between the hands and the rock or wall.
Chemically known as calcium carbonate. It is added to paper, to contribute to its porosity, whiteness and to regulate the burn speed in combination with other burn additives.
A drying agent made from powdered magnesium carbonate, used by climbers to keep sweaty hands dry.
a type of limestone. Chalk is white in colour and very fine grained. It is formed by the accumulation of minute shallow marine organisms. The white cliffs of Dover are a well-known chalk deposit of Cretaceous age.
Carbonate of magnesium, or gymnasts' chalk, used to keep a climber's hands dry for better grip.
A white, powdery substance that climbers plunge their hands into when they're getting really nervous about their next move. Said to help dry sweaty hands, chalking up seems to serve more as a psychological pacifier than a boost to physical proficiency.
Is made from magnesium carbonate. Climbers use chalk to counteract sweaty hands and improve grip.
a common form of calcium carbonate with a very fine structure. A limestone, cretaceous in age, usually very porous and fine-grained ranging from white to pale grey in colour.
called cretaceous limestone. An example of porous rock.
Magnesium Carbonate. Used to remove sweat from hands during climbing. Contained in a Chalk Bag.
Various soft stones or earths used as drawing materials. The three main types most commonly used are black chalk (carbonaceous shale), red chalk (red ochre), and white chalk (made from various types of limestone). Often the terms chalk, crayon, and pastel are used interchangeably, though there are differences among them.
Chalk is a sedimentary rock consisting largely of the fossil remains of tiny plants that lived in ancient seas. It is a form of limestone.
Calcium carbonate. Rock salt Sodium chloride
a variety of white limestone made from tiny mud-sized particles. The Chalk forms many of the low rounded hills in the south-east of England and was formed during the Cretaceous period.
Magnesium carbonate, carried in a pouch at the waist, used to improve climbers' grip on the rock.
A soft compact calcite, CaCO3, with varying amounts of silica, quartz, feldspar, or other mineral impurities, generally gray-white or yellow-white and derived chiefly from fossil seashells.
Gymnastic chalk used by climbers to keep their fingers dry
Powder used on hands for secure grip.
Calcium carbonate, either natural or artificially prepared, finely ground to make a white substance used in gesso. It may be pressed in sticks and used in its white form, or mixed with colored pigments to make pastels.
Powdered magnesium carbonate used by climbers to dry sweaty hands.
a very fine-grained limestone, typically of Late Cretaceous age.
A soft form of limestone that is not well cemented and thus is often powdery and brittle.
A soft white limestone, composed of the calcium carbonate remains of minute organisms (mostly from planktonic algae).
Form of limestone. This sedimentary rock is composed of the shells and skeletons of marine microorganisms.
A rock formed from the deposition of planktonic creatures skeletons which lived in the seas during cretaceous period.
(n): standard magnesium carbonate chalk to keep a climber's hands dry
White stuff (magnesium carbonate, in fact) intended to keep hands dry, though "to keep holds white" sometimes seems like a more realistic description. Not the same as teachers' chalk or gymnasts' resin.
The term refers to either (a) soft white limestone which consists of very pure calcium carbonate and leaves little residue when treated with hydrochloric acid, and sometimes consists largely of the remains of foraminifera, echinoderms, molluscs, and other marine organisms, or(b) The upper or final member of the cretaceous system.
A soft form of limestone composed chiefly of calcite shells of microorganisms [LCOTE
A fine grained, white calcium carbonate composed of coccoliths. Common in the Cretaceous of western Europe.
Chalk (IPA: ) is a soft, white, porous form of limestone composed of the mineral calcite. It is also a sedimentary rock. It is relatively resistant to erosion and slumping compared to the clays with which it is usually associated, so forms tall steep cliffs where chalk ridges meet the sea.