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Hasil cari dari kata atau frase: turmaline(0.01058 detik)
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English → English (gcide)
Tourmaline \Tour"ma*line\, n. [F. tourmaline, cf. It. turmalina,
tormalina, NL. turmalina, turmalinus; all fr. tournamal, a
name given to this stone in Ceylon.] (Min.)
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. [Written
also turmaline .]
Note: Crystals of tourmaline when heated exhibit electric
polarity (see Pyroelectric, n.). Tourmaline is also
used in the form of a polariscope called tourmaline