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Glauconite :: Glauconite (n.) The green mineral characteristic of the greensand of the chalk and other formations. It is a hydrous silicate of iron and potash. See Greensand.

Bufonite :: Bufonite (n.) An old name for a fossil consisting of the petrified teeth and palatal bones of fishes belonging to the family of Pycnodonts (thick teeth), whose remains occur in the oolite and chalk formations; toadstone; -- so named from a notion that it was originally formed in the head of a toad..

Whiting :: Whiting (n.) Chalk prepared in an impalpable powder by pulverizing and repeated washing, used as a pigment, as an ingredient in putty, for cleaning silver, etc..

Calk :: Calk (v. t.) To copy, as a drawing, by rubbing the back of it with red or black chalk, and then passing a blunt style or needle over the lines, so as to leave a tracing on the paper or other thing against which it is laid or held..

Reddle :: Reddle (n.) Red chalk. See under Chalk.

Pencil :: Pencil (n.) A slender cylinder or strip of black lead, colored chalk, slate etc., or such a cylinder or strip inserted in a small wooden rod intended to be pointed, or in a case, which forms a handle, -- used for drawing or writing. See Graphite..

Line :: Line (n.) A more or less threadlike mark of pen, pencil, or graver; any long mark; as, a chalk line..

Verditer :: Verditer (n.) Either one of two pigments (called blue verditer, and green verditer) which are made by treating copper nitrate with calcium carbonate (in the form of lime, whiting, chalk, etc.) They consist of hydrated copper carbonates analogous to the minerals azurite and malachite..

Chalking :: Chalking (p. pr. & vb. n.) of Chal.

Chalkiness :: Chalkiness (n.) The state of being chalky.

Calciform :: Calciform (a.) In the form of chalk or lime.

Chalk :: Chalk (n.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common limestone..

Cretose :: Cretose (a.) Chalky; cretaceous.

Cretaceously :: Cretaceously (adv.) In a chalky manner; as chalk.

Clunch :: Clunch (n.) One of the hard beds of the lower chalk.

Chalk :: Chalk (v. t.) To rub or mark with chalk.

Micraster :: Micraster (n.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows..

Cretaceous :: Cretaceous (a.) Having the qualities of chalk; abounding with chalk; chalky; as, cretaceous rocks and formations. See Chalk..

Insoluble :: Insoluble (a.) Not soluble; in capable or difficult of being dissolved, as by a liquid; as, chalk is insoluble in water..

Portland Cement :: Portland cement () A cement having the color of the Portland stone of England, made by calcining an artificial mixture of carbonate of lime and clay, or sometimes certain natural limestones or chalky clays. It contains a large proportion of clay, and hardens under water..

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