| 释义 |
Definition of tourmaline in English: tourmalinenoun ˈtʊəməliːnˈtʊəməlɪn mass nounA 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. 电气石 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.
OriginMid 18th century: from French, based on Sinhalese tōramalli 'carnelian'. Definition of tourmaline in US English: tourmalinenoun 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. 电气石 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.
OriginMid 18th century: from French, based on Sinhalese tōramalli ‘carnelian’. |