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be obtained from the urine of herbivorous animals when fed on the mango. It consists if a magnesium salt of euxanthic acid. Called also puri, purree, and Indian yellow.

An amorphous mineral of apple-green color; a hydrous silicate of nickel and magnesia. It is an important ore of nickel.

are metallic element, of a silver white color, and low specific gravity (2.1), resembling magnesium. It never occurs naturally in the free state, but is always combined, usually with silica or alumina, or both; as in the minerals phenacite, chrysoberyl, beryl or emerald, euclase, and danalite. It was named from its oxi…

A hydrous silicate of magnesia.

treous brown color, found in the ejected masses of Vesuvius. It is a silicate of iron and magnesia, containing fluorine.

red. (a) A purplish red earth or pigment composed of a silicate of iron and alumina, with magnesia. It comes from the Persian Gulf. Called also Persian red. (b) See Almagra. -- Indian rice (Bot.), a reedlike water grass. See Rice. -- Indian shot (Bot.), a plant of the genus Canna (C. Indica). The hard black seeds are…

A silicate of alumina, iron, and magnesia, having a bright blue color and vitreous luster; cordierite. It is remarkable for its dichroism, and is also called dichroite.

A compound salt consisting chiefly of potassium chloride and magnesium sulphate, occurring at the Stassfurt salt mines in Prussian Saxony.

Hydrous sulphate of magnesia found at the salt mines of Stassfurt, Prussian Saxony.

ll masses, or in monoclinic crystals; blue spar. It is a hydrous phosphate of alumina and magnesia.

consisting chiefly of calcium carbonate or carbonate of lime. It sometimes contains also magnesium carbonate, and is then called magnesian or dolomitic limestone. Crystalline limestone is called marble.

A borate of iron and magnesia, occurring in fibrous masses of a blackish green color.

soft, and light enough when in dry masses to float in water. It is a hydrous silicate of magnesia, and is obtained chiefly in Asia Minor. It is manufacturd into tobacco pipes, cigar holders, etc. Also called sepiolite.

e metallic elements of the alkali and alkaline earth groups, as sodium, lithium, calcium, magnesium, etc.; also, sometimes, the metals of the earths, as aluminium. -- Muntz metal, an alloy for sheathing and other purposes, consisting of about sixty per cent of copper, and forty of zinc. Sometimes a little lead is adde…

A grayish or dark green mineral, consisting essentially of magnesia (magnesium oxide), occurring in granular forms or in isometric crystals.

ar bronze-red or copperlike color and a pearly luster. It is a silicate of aluminia, with magnesia, potash, and some fluorine. It is characteristic of crystalline limestone or dolomite and serpentine. See Mica.

An apple-green mineral having a greasy feel. It is a hydrous silicate of nickel, magnesia, aluminia, and iron.

brick-red color, being tinged with iron, and consisting chiefly of the sulphates of lime, magnesia, and soda.

diopside, malacolite, salite, coccolite, augite, etc. They are all silicates of lime and magnesia with sometimes alumina and iron. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basalt, gabbro, etc.

A narrow strip or shred; as, a steel or magnesium ribbon; sails torn to ribbons.