Lime Chalk

Lime (material)

Lime is an inorganic material composed primarily of calcium oxides and hydroxides. It is also the name for calcium oxide which is used as an industrial mineral and is made by heating calcium carbonate in a kiln. Calcium oxide can occur as a product of coal-seam fires and in altered limestone xenoliths in volcanic ejecta. The International Mineralogical Association recognizes lime as a mineral with the chemical formula of CaO. The word lime originates with its earliest use as building mortar and has the sense of sticking or adhering.

Chalk

Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed under the sea by the accumulation and lithification of hard parts of organisms, mostly microscopic plankton, which had settled to the sea floor. Chalk is common throughout Western Europe, where deposits underlie parts of France, and steep cliffs are often seen where they meet the sea in places such as the Dover cliffs on the Kent coast of the English Channel.

Lime (color)

Lime is a color that is a shade of yellow-green, so named because it is a representation of the color of the citrus fruit lime. It is the color that is in between the web color chartreuse and yellow on the color wheel. Alternate names for this color included yellow-green, lemon-lime, lime green, or bitter lime.

lime

Noun

1. Any inorganic material containing calcium, usually calcium oxide (quicklime) or calcium hydroxide (slaked lime).
2. Any gluey or adhesive substance that traps or captures; sometimes a synonym for birdlime.

Verb

1. To treat with calcium hydroxide or calcium oxide (lime).
2. To smear with birdlime.

chalk

Noun

1. A soft, white, powdery limestone (calcium carbonate, CaCO3).
2. A piece of chalk, or nowadays processed compressed gypsum (calcium sulfate, CaSO4), that is used for drawing and for writing on a blackboard (chalkboard).

Verb

1. To apply chalk to anything, such as the tip of a billiard cue.
2. To record something, as on a blackboard, using chalk.