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Turmaline :: Turmaline (n.) See Tourmaline.

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..

Polarizer :: Polarizer (n.) That which polarizes; especially, the part of a polariscope which receives and polarizes the light. It is usually a reflecting plate, or a plate of some crystal, as tourmaline, or a doubly refracting crystal..

Sagenitic :: Sagenitic (a.) Resembling sagenite; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like..

Borosilicate :: Borosilicate (n.) A double salt of boric and silicic acids, as in the natural minerals tourmaline, datolite, etc..

Indicolite :: Indicolite (n.) A variety of tourmaline of an indigo-blue color.

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..

Schorl :: Schorl (n.) Black tourmaline.

Tourmaline :: Tourmaline (n.) A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels..

Cockle :: Cockle (n.) The mineral black tourmaline or schorl; -- so called by the Cornish miners.

Luxullianite :: Luxullianite (n.) A kind of granite from Luxullian, Cornwall, characterized by the presence of radiating groups of minute tourmaline crystals..

Rubellite :: Rubellite (n.) A variety of tourmaline varying in color from a pale rose to a deep ruby, and containing lithium..

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