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Zirconium :: Zirconium (n.) A rare element of the carbon-silicon group, intermediate between the metals and nonmetals, obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance. Symbol Zr. Atomic weight, 90.4..

Brushite :: Brushite (n.) A white or gray crystalline mineral consisting of the acid phosphate of calcium.

Ligustrin :: Ligustrin (n.) A bitter principle found in the bark of the privet (Ligustrum vulgare), and extracted as a white crystalline substance with a warm, bitter taste; -- called also ligustron..

Isomorphism :: Isomorphism (n.) A similarity of crystalline form between substances of similar composition, as between the sulphates of barium (BaSO4) and strontium (SrSO4). It is sometimes extended to include similarity of form between substances of unlike composition, which is more properly called homoeomorphism..

Oxamic :: Oxamic (a.) Pertaining to, or designating, an acid NH2.C2O2.HO obtained as a fine crystalline powder, intermediate between oxalic acid and oxamide. Its ammonium salt is obtained by boiling oxamide with ammonia..

Mineral :: Mineral (v. i.) An inorganic species or substance occurring in nature, having a definite chemical composition and usually a distinct crystalline form. Rocks, except certain glassy igneous forms, are either simple minerals or aggregates of minerals..

Solanidine :: Solanidine (n.) An alkaloid produced by the decomposition of solanine, as a white crystalline substance having a harsh bitter taste..

Carotin :: Carotin (n.) A red crystallizable tasteless substance, extracted from the carrot..

Lactucin :: Lactucin (n.) A white, crystalline substance, having a bitter taste and a neutral reaction, and forming one of the essential ingredients of lactucarium..

Fraxin :: Fraxin (n.) A colorless crystalline substance, regarded as a glucoside, and found in the bark of the ash (Fraxinus) and along with esculin in the bark of the horse-chestnut. It shows a delicate fluorescence in alkaline solutions; -- called also paviin..

Suberin :: Suberic (a.) Of or pertaining to cork; specifically, designating an acid, C6H12.(CO2H)2, homologous with oxalic acid, and obtained from cork and certain fatty oils, as a white crystalline substance..

Hyaline :: Hyaline (a.) Glassy; resembling glass; consisting of glass; transparent, like crystal..

Hemitrope :: Hemitrope (n.) That which is hemitropal in construction; (Crystallog.) a twin crystal having a hemitropal structure.

Terpin :: Terpin (n.) A white crystalline substance regarded as a hydrate of oil of turpentine.

Mimetite :: Mimetite (n.) A mineral occurring in pale yellow or brownish hexagonal crystals. It is an arseniate of lead.

Crystallography :: Crystallography (n.) The doctrine or science of crystallization, teaching the system of forms among crystals, their structure, and their methods of formation..

Phlorone :: Phlorone (n.) A yellow crystalline substance having a peculiar unpleasant odor, resembling the quinones, and obtained from beechwood tar and coal tar, as also by the oxidation of xylidine; -- called also xyloquinone..

Retene :: Retene (n.) A white crystalline hydrocarbon, polymeric with benzene. It is extracted from pine tar, and is also found in certain fossil resins..

Sapogenin :: Sapogenin (n.) A white crystalline substance obtained by the decomposition of saponin.

Gypsum :: Gypsum (n.) A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety..

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