Definition of tourmaline in English:

tourmaline

noun ˈtʊəməliːnˈtʊəməlɪn

mass noun

A typically black or blackish mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and piezoelectric properties.
Example sentencesExamples
- Inclusions of quartz, tourmaline, apatite, and muscovite crystals have been described.
- It consists of clasts of angular to rounded quartz, plagioclase, tourmaline and rock fragments, up to 3 mm in diameter.
- After quartz and microcline, tourmaline is arguably the next most abundant mineral found in the miarolitic cavities.
- In the line rock, this black tourmaline occurs as tiny prismatic crystals.
- The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet.

Origin

Mid 18th century: from French, based on Sinhalese tōramalli 'carnelian'.

Definition of tourmaline in US English:

tourmaline

noun

A typically black or blackish mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and piezoelectric properties.
Example sentencesExamples
- Inclusions of quartz, tourmaline, apatite, and muscovite crystals have been described.
- After quartz and microcline, tourmaline is arguably the next most abundant mineral found in the miarolitic cavities.
- The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet.
- It consists of clasts of angular to rounded quartz, plagioclase, tourmaline and rock fragments, up to 3 mm in diameter.
- In the line rock, this black tourmaline occurs as tiny prismatic crystals.

Origin

Mid 18th century: from French, based on Sinhalese tōramalli ‘carnelian’.

单词	tourmaline
释义	Definition of tourmaline in English: tourmaline noun ˈtʊəməliːnˈtʊəməlɪn mass noun A typically black or blackish mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and piezoelectric properties. Example sentencesExamples Inclusions of quartz, tourmaline, apatite, and muscovite crystals have been described. It consists of clasts of angular to rounded quartz, plagioclase, tourmaline and rock fragments, up to 3 mm in diameter. After quartz and microcline, tourmaline is arguably the next most abundant mineral found in the miarolitic cavities. In the line rock, this black tourmaline occurs as tiny prismatic crystals. The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet. Origin Mid 18th century: from French, based on Sinhalese tōramalli 'carnelian'. Definition of tourmaline in US English: tourmaline noun A typically black or blackish mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and piezoelectric properties. Example sentencesExamples Inclusions of quartz, tourmaline, apatite, and muscovite crystals have been described. After quartz and microcline, tourmaline is arguably the next most abundant mineral found in the miarolitic cavities. The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet. It consists of clasts of angular to rounded quartz, plagioclase, tourmaline and rock fragments, up to 3 mm in diameter. In the line rock, this black tourmaline occurs as tiny prismatic crystals. Origin Mid 18th century: from French, based on Sinhalese tōramalli ‘carnelian’.
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