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Enantiomorphous :: Enantiomorphous (a.) Similar, but not superposable, i. e., related to each other as a right-handed to a left-handed glove; -- said of certain hemihedral crystals..

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

Twin :: Twin (n.) A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other..

Chiastolite :: Chiastolite (n.) A variety of andalusite; -- called also macle. The tessellated appearance of a cross section is due to the symmetrical arrangement of impurities in the crystal.

Violantin :: Violantin (n.) A complex nitrogenous substance, produced as a yellow crystalline substance, and regarded as a complex derivative of barbituric acid..

Glyoxime :: Glyoxime (n.) A white, crystalline, nitrogenous substance, produced by the action of hydroxylamine on glyoxal, and belonging to the class of oximes; also, any one of a group of substances resembling glyoxime proper, and of which it is a type. See Oxime..

Needle :: Needle (v. t.) To form in the shape of a needle; as, to needle crystals..

Thionine :: Thionine (n.) An artificial red or violet dyestuff consisting of a complex sulphur derivative of certain aromatic diamines, and obtained as a dark crystalline powder; -- called also phenylene violet..

Harmine :: Harmine (n.) An alkaloid accompanying harmaline (in the Peganum harmala), and obtained from it by oxidation. It is a white crystalline substance..

Boron :: Boron (n.) A nonmetallic element occurring abundantly in borax. It is reduced with difficulty to the free state, when it can be obtained in several different forms; viz., as a substance of a deep olive color, in a semimetallic form, and in colorless quadratic crystals similar to the diamond in hardness and other properties. It occurs in nature also in boracite, datolite, tourmaline, and some other minerals. Atomic weight 10.9. Symbol B..

Wagnerite :: Wagnerite (n.) A fluophosphate of magnesia, occurring in yellowish crystals, and also in massive forms..

Succinyl :: Succinuric (a.) Pertaining to, or designating, an acid amide, analogous to succinamic acid, which is obtained as a white crystalline substance by heating urea with succinic anhydride. It is known also in its salts..

Palmitic :: Palmitic (a.) Pertaining to, or obtained from, palmitin or palm oil; as, palmitic acid, a white crystalline body belonging to the fatty acid series. It is readily soluble in hot alcohol, and melts to a liquid oil at 62¡ C..

Orthometric :: Orthometric (a.) Having the axes at right angles to one another; -- said of crystals or crystalline forms.

Crystalline :: Crystalline (a.) Imperfectly crystallized; as, granite is only crystalline, while quartz crystal is perfectly crystallized..

Dichroic :: Dichroic (a.) Having the property of dichroism; as, a dichroic crystal..

Frangulin :: Frangulin (n.) A yellow crystalline dyestuff, regarded as a glucoside, extracted from a species (Rhamnus Frangula) of the buckthorn; -- called also rhamnoxanthin..

Orpiment :: Orpiment (n.) Arsenic sesquisulphide, produced artificially as an amorphous lemonyellow powder, and occurring naturally as a yellow crystalline mineral; -- formerly called auripigment. It is used in king's yellow, in white Indian fire, and in certain technical processes, as indigo printing..

Purpurin :: Purpurin (n.) A dyestuff resembling alizarin, found in madder root, and extracted as an orange or red crystalline substance..

Lactide :: Lactide (n.) A white, crystalline substance, obtained from also, by extension, any similar substance..

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