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granular mineral of a grayish or yellowish color, found in Bolton, Massachusetts. It is a silicate of magnesium, belonging to the chrysolite family.

olitic mineral occurring in white monoclinic crystals with pearly luster. It is a hydrous silicate of aluminia, baryta, and strontia.

A variety of enstatite, often having a bronzelike luster. It is a silicate of magnesia and iron, of the pyroxene family.

A mineral, the hydrous silicate of zinc.

A mineral of a brownish of cherry-red color, commonly massive. It is a hydrous silicate of cerium and allied metals.

A hydrous silicate of magnesium, allied to serpentine, occurring in waxlike masses of a yellow or greenish color.

dral crystals, varying, in color from white to yellow or red. It is essentially a hydrous silicate of alumina and lime. Called also chabasie.

nerals, usually of a green color and micaceous to granular in structure. They are hydrous silicates of alumina, iron, and magnesia. Chlorite slate, a schistose or slaty rock consisting of alumina, iron, and magnesia.

sive mineral, greenish in color, and opal-like in appearance. It is essentially a hydrous silicate of iron.

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

A hydrous silicate of copper, occurring massive, of a blue or greenish blue color.

A soft earth, which is plastuc, or may be molded with the hands, consisting of hydrous silicate of alumunium. 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.…

n silky fibers of a lavender blue color. It is related to hornblende and is essentially a silicate of iron and soda; -- called also blue asbestus. A silicified form, in which the fibers penetrating quartz are changed to oxide of iron, is the yellow brown tiger-eye of the jewelers.

A mineral consisting principally of silicate of iron, and crystallizing in hexagonal prisms with perfect basal cleavage; -- so named from the Swedish mineralogist Cronstedt.

occuring in thin-bladed crystals and crystalline aggregates, of a sky-blue color. It is a silicate of aluminium. [Written also kyanite.]

A mineral occuring in octahedral crystals, also massive, of a reddish color. It is a silicate of iron, zinc manganese, and glicinum, containing sulphur.

A borosilicate of lime, first found at Danbury, Conn. It is near the topaz in form. Dana.

A borosilicate of lime commonly occuring in glassy,, greenish crystals. [Written also datholite.]

A hydrous silicate of copper, occurring in emerald-green crystals.

A grayish white zeolitic mineral, in tetragonal crystals. It is a hydrous silicate of alumina and baryta.