Question

what is mean by gemstone emerald explain it with a image​

Answer 1

Answer:

Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and/or sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.

Explanation:

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Answer 2

Explanation:

Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and/or sometimes vanadium.[2] Beryl has a hardness of 7.5–8 on the Mohs scale.[2] Most emeralds are highly included,[3] so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate.

Color

Bluish green to green

Crystal habit

Massive to well Crystalline

Cleavage

Imperfect on the [0001]

Fracture

Conchoidal

Mohs scale hardness

7.5–8

Luster

Vitreous

Streak

White

Diaphaneity

Transparent to opaque

Specific gravity

Average 2.76

Optical properties

Uniaxial (−)

Refractive index

nω = 1.564–1.595,

nε = 1.568–1.602

Birefringence

δ = 0.0040–0.0070

Ultraviolet fluorescence

None (some fracture-filling materials used to improve emerald's clarity do fluoresce, but the stone itself does not)