Lexic.us

Definition of Tourmaline

1. Noun. A mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones.

Definition of Tourmaline

1. 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.

Definition of Tourmaline

1. [n -S]

Medical Definition of Tourmaline

1. 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. Alternative forms: turmaline. Crystals of tourmaline when heated exhibit electric polarity (see Pyroelectric,). Tourmaline is also used in the form of a polarizcope called tourmaline tongs. Origin: F. Tourmaline, cf. It. Turmalina, tormalina, NL. Turmalina, turmalinus; all fr. Tournamal, a name given to this stone in Ceylon. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Tourmaline

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