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Vesuvianite :: Vesuvianite (n.) A mineral occurring in tetragonal crystals, and also massive, of a brown to green color, rarely sulphur yellow and blue. It is a silicate of alumina and lime with some iron magnesia, and is common at Vesuvius. Also called idocrase..

Salt :: salt () Sulphate of magnesia having cathartic qualities; -- originally prepared by boiling down the mineral waters at Epsom, England, -- whence the name; afterwards prepared from sea water; but now from certain minerals, as from siliceous hydrate of magnesia..

Serpentinize :: Serpentinize (v. t.) To convert (a magnesian silicate) into serpentine.

Magnesia :: Magnesia (n.) A light earthy white substance, consisting of magnesium oxide, and obtained by heating magnesium hydrate or carbonate, or by burning magnesium. It has a slightly alkaline reaction, and is used in medicine as a mild antacid laxative. See Magnesium..

Iolite :: Iolite (n.) 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..

Zechstein :: Zechstein (n.) The upper division of the Permian (Dyas) of Europe. The prevailing rock is a magnesian limestone.

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

Magnesium :: Magnesium (n.) A light silver-white metallic element, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24.4. Specific gravity, 1.75..

Ludwigite :: Ludwigite (n.) A borate of iron and magnesia, occurring in fibrous masses of a blackish green color..

Warwickite :: Warwickite (n.) A dark brown or black mineral, occurring in prismatic crystals imbedded in limestone near Warwick, New York. It consists of the borate and titanate of magnesia and iron..

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

Meerschaum :: Meerschaum (n.) A fine white claylike mineral, 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..

Humite :: Humite (n.) A mineral of a transparent vitreous brown color, found in the ejected masses of Vesuvius. It is a silicate of iron and magnesia, containing fluorine..

Limestone :: Limestone (n.) A rock 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..

Conite :: Conite (n.) A magnesian variety of dolomite.

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

Strychnia :: Struvite (n.) A crystalline mineral found in guano. It is a hydrous phosphate of magnesia and ammonia.

Ripidolite :: Ripidolite (n.) A translucent mineral of a green color and micaceous structure, belonging to the chlorite group; a hydrous silicate of alumina, magnesia, and iron; -- called also clinochlore..

Chrysolite :: Chrysolite (n.) A mineral, composed of silica, magnesia, and iron, of a yellow to green color. It is common in certain volcanic rocks; -- called also olivine and peridot. Sometimes used as a gem. The name was also early used for yellow varieties of tourmaline and topaz..

Chlorite :: Chlorite (n.) The name of a group of minerals, usually of a green color and micaceous to granular in structure. They are hydrous silicates of alumina, iron, and magnesia..

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