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Tourmaline   Listen
noun
Tourmaline  n.  (Written also turmaline)  (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. Note: Crystals of tourmaline when heated exhibit electric polarity (see Pyroelectric, n.). Tourmaline is also used in the form of a polariscope called tourmaline tongs.






Collaborative International Dictionary of English 0.48








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"Tourmaline" Quotes from Famous Books



... castle-like crumbling piles and long jagged crests that look like artificial masonry; but on the north side it is abruptly precipitous and banked with lasting snow. Most of the broad summit is comparatively level and thick sown with crystals, quartz, mica, hornblende, feldspar, granite, zircon, tourmaline, etc., weathered out and strewn closely and loosely as if they had been sown broadcast. Their radiance is fairly dazzling in sunlight, almost hiding the multitude of small flowers that grow among them. ...
— The Yosemite • John Muir

... radiance leap Across the chasm, and crown the western rim Of alabaster with a far-away Rampart of pearl, and flowing down by walls Of changeful opal, deepen into gold Of topaz, rosy gold of tourmaline, Crimson of garnet, green and gray of jade, Purple of amethyst, and ruby red, Beryl, and sard, and royal porphyry; Until the cataract of colour breaks Upon the ...
— The Poems of Henry Van Dyke • Henry Van Dyke

... its towers of beryl, Tourmaline, hyacinth, topaz and pearl, Free to the King if he have but the pass-word, Free to the veriest ...
— Masters of the Guild • L. Lamprey

... grey sheen of the gneiss were dark bands of schist which tracked about in an irregular manner. Sporadic quartz veins here and there showed a light tint. They were specially interesting, for they carried some less common minerals such as beryl, tourmaline, garnet, coarse mica and ores of iron, copper and molybdenum. The ores were present in small quantities, but gave promise of larger bodies in the vicinity and indicated the probability of mineral wealth beneath ...
— The Home of the Blizzard • Douglas Mawson

... white mica as one of its constituents. It is seldom found in the darker coloured rocks, or in limestone country, but it sometimes occurs in gneiss, mica schist, and chlorite schist. Numerous other minerals are at times mistaken for tin, the most common of which are tourmaline or schorl, garnet, wolfram (which is a tungstate of iron with manganese), rutile or titanic acid, blackjack or zinc blende, together with magnetic, titanic, and ...
— Getting Gold • J. C. F. Johnson

... account of electricity dates back to 600 years B. C. Thales of Miletus was the first to describe the properties of amber, which, when rubbed, attracted and repelled light bodies. The ancients also described what was probably tourmaline, a mineral which has the same qualities. The torpedo, a fish which has the power of emitting electric impulses, was known in ...
— Electricity for Boys • J. S. Zerbe



Words linked to "Tourmaline" :   mineral, transparent gem



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