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tourmaline 音标拼音: [t'ʊrməl,in]

n. 电石

电石

WordNet (r) 3.0 (2006) (WordNet)

tourmaline
n 1: 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

The Collaborative International Dictionary of English v.0.48 (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} .]
[1913 Webster]

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.
[1913 Webster]

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Tourmaline - Wikipedia
Tourmaline ( ˈtʊərməlɪn, - ˌliːn ⓘ TOOR-mə-lin, -⁠leen) is a crystalline silicate mineral group in which boron is compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium This gemstone comes in a wide variety of colors
What Is Tourmaline Gemstone | Tourmaline Stone – GIA
Tourmalines have a variety of exciting colors with one of the widest color ranges of any gem Tourmaline’s colors have many different causes It’s generally agreed that traces of iron, and possibly titanium, induce green and blue colors Manganese produces reds and pinks, and possibly yellows
The 15 Different Types Of Tourmaline (With Photos) - Rock Chasing
Are you curious about the different types of tourmaline? Read on as we discuss the unique properties and characteristics of these tourmaline types
Tourmaline: Earths most colorful mineral and gemstone
What is Tourmaline? Tourmaline is the name of a large group of boron silicate minerals These minerals share a common crystal structure and similar physical properties - but vary tremendously in chemical composition
Tourmaline Gem, Price, and Jewelry Information - IGS
Discover tourmaline's stunning colors, value, and properties Learn why this October birthstone makes exceptional jewelry and how to identify genuine tourmaline varieties Tourmaline represents an extraordinarily diverse gemstone family with properties that make it a jewelry favorite
Tourmaline 101: History, Meaning, Types, Origin Properties
Discover tourmaline’s history, symbolism, varieties, origin, and key properties in this beginner-friendly guide
Tourmaline Gemstone: Properties, Meanings, Value More
Tourmaline refers to a group of minerals that vary in chemical composition, known for their extensive range of colors and varieties Learn more about tourmaline symbolism, properties, uses, and more!
Tourmaline: Ultimate Guide To Tourmaline (What It Is and Where To Find . . .
Discover the origins, properties, and varieties of tourmaline, and learn the best locations to find this colorful gemstone Whether you're a seasoned collector or just starting out, our guide has everything you need to add tourmaline to your collection today
Tourmaline: Everything You Need To Know
The ultimate guide to tourmaline With over 1000 unique hues, large carat sizes and crystal clarity, tourmaline has it all! This is everything you need to know
Tourmaline: The gemstone Tourmaline information and pictures
Tourmaline is the most colorful of all gemstones It occurs in all colors, but pink, red, green, blue and multicolored are its most well-known gem colors Scientifically, tourmaline is not a single mineral, but a group of minerals related in their physical and chemical properties

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