English

Quiz "Gemstones"

Gemstones

a form of opal having a reddish-brown coloration

Gemstones

a variety of corundum resembling almandine in colour and used as a gemstone

Gemstones

a pale greenish-blue transparent variety of beryl used as a gemstone

Gemstones

any of a group of hard glassy minerals of variable colour consisting of complex borosilicates of aluminium with quantities of lithium, sodium, calcium, potassium, iron, and magnesium in hexagonal crystalline form: used in optical and electrical equipment and in jewellery

Gemstones

a brown, yellow, green, or grey lustrous mineral consisting of calcium titanium silicate in monoclinic crystalline form. It occurs in metamorphic and acid igneous rocks and is used as a gemstone. Formula: CaTiSiO5
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