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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
Everything you ever wanted to know about tourmaline Find value guidelines, scientific data, expert comments, and more in our Gem Listings
Tourmaline 101: History, Meaning, Types, Origin Properties
Discover tourmaline’s history, symbolism, varieties, origin, and key properties in this beginner-friendly guide
Tourmaline - 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
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 Colors Guide: Most Common, Rarest, and Most Valuable
Tourmaline is the most color-diverse gemstone family in the world, ranging from common black schorl to the electric neon blue-green of Paraiba, the rarest and most valuable variety at $15,000 to $50,000 per carat
Tourmaline Mineral Explained: Properties and Uses
Learn about tourmaline, one of the most colorful mineral groups on Earth Explore its properties, formation, crystal structure, varieties, and uses

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