tourmaline

(Pronunciation -تلفظ سنیۓ ) US:

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Noun: tourmaline

1. tourmaline
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

Generic Words:

mineral, transparent gem

Specific Words:

schorl

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