[
UK
/tˈɔːməlˌaɪn/
]
[ US /ˈtʊɹməˌɫin/ ]
[ US /ˈtʊɹməˌɫin/ ]
NOUN
- 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
How To Use tourmaline In A Sentence
- The quartzite shows granoblastic and blastopsammitic texture, with grain sizes varying from coarse sand to very fine pebble and with minor microcrystals of sericite, fuchsite, andalusite and iron oxide, besides detrital tourmaline, rutile, and zircon." link Archive 2008-03-01
- The quartzite shows granoblastic and blastopsammitic texture, with grain sizes varying from coarse sand to very fine pebble and with minor microcrystals of sericite, fuchsite, andalusite and iron oxide, besides detrital tourmaline, rutile, and zircon." link Archive 2008-03-01
- The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet.
- Rubellite is the term used for red or pink tourmaline, and indicolite is the term used for blue tourmaline.
- A greisen is a quartz - mica aggregate containing significant amounts of cassiterite, wolframite, fluorite, topaz, rutile, and tourmaline.
- In the line rock, this black tourmaline occurs as tiny prismatic crystals.
- A color-plate section on glossy paper contains forty-six photos of cut gems and mineral specimens and includes a color photo of the famous Hamlin varicolored tourmaline necklace.
- The gem was not a ruby, and it wasn't an emerald either, and it wasn't a diamond or an opal or a pearl, and it wasn't jade or tourmaline or jasper.
- Her collection is not large, but it includes mica, aquamarine, tourmaline, and other pretty stones.
- He said if exploited in the right way Zambia's great variety of gemstones that includes emeralds, amethyst, aquamarines, tourmalines and garnets offered great potential for poverty reduction.