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spinel
Historically, this mineral was frequently mistaken for ruby or sapphire due to its similar hardness and color. Many famous red gemstones in royal crowns, once thought to be rubies, were later identified as spinels.
In a geological or material science context, the term is used uncountably to describe the mineral species or the crystal structure. When referring to individual gemstones or specific varieties of the mineral, it is used as a countable noun.
Meanings
Examples
The museum displays a rare black spinel from the 18th century.
The jeweler carefully polished the spinel to enhance its brilliance.
Spinel is often mistaken for ruby due to its similar color.
She wore a necklace featuring a large pink spinel.
The geologist identified the mineral as a magnesium aluminum spinel.