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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..

Chondrodite :: Chondrodite (n.) A fluosilicate of magnesia and iron, yellow to red in color, often occurring in granular form in a crystalline limestone..

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..

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

Spinel :: Spinelle (n.) A mineral occuring in octahedrons of great hardness and various colors, as red, green, blue, brown, and black, the red variety being the gem spinel ruby. It consist essentially of alumina and magnesia, but commonly contains iron and sometimes also chromium..

Clay :: Clay (n.) A soft earth, which is plastic, or may be molded with the hands, consisting of hydrous silicate of aluminium. It is the result of the wearing down and decomposition, in part, of rocks containing aluminous minerals, as granite. Lime, magnesia, oxide of iron, and other ingredients, are often present as impurities..

Earth :: Earth (n.) A similar oxide, having a slight alkaline reaction, as lime, magnesia, strontia, baryta..

Polyhalite :: Polyhalite (n.) A mineral usually occurring in fibrous masses, of a brick-red color, being tinged with iron, and consisting chiefly of the sulphates of lime, magnesia, and soda..

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

Saturant :: Saturant (n.) An antacid, as magnesia, used to correct acidity of the stomach..

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..

Hydromagnesite :: Hydromagnesite (n.) A hydrous carbonate of magnesia occurring in white, early, amorphous masses..

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

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

Cabrerite :: Cabrerite (n.) An apple-green mineral, a hydrous arseniate of nickel, cobalt, and magnesia; -- so named from the Sierra Cabrera, Spain..

Phlogopite :: Phlogopite (n.) A kind of mica having generally a peculiar 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..

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

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

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..

Bitter Spar :: Bitter spar () A common name of dolomite; -- so called because it contains magnesia, the soluble salts of which are bitter. See Dolomite..

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