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Demantoid

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BMM681313

Demantoid

Description Tabs

Description
Locality: 
Takab, West Azerbaijan Province, Iran
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2.5 × 2 cm
Description

Fantastic highly lustrous, emerald-colored demantoid garnets on matrix. Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals. This kind of andradite is very rare and therefore one of the most desirable gemstones. As mentioned above, is it characterized by its adamantine luster! A pair of lustrous, forest-green andradite (v. demantoid) garnet crystals are perfectly placed on one side of this matrix specimen. The whole crystal- formation is 15 mm in size. This specimen is in excellent condition, and unlike most demantoid-garnets which have a yellowish-green tint, these show nearly the color of a fine emerald – and that’s impressive. The crystal surfaces are high-gloss with a very fine structure. The appealing individual crystals sit exposed on a bright matrix, which makes this specimen a very beautiful and truly impressive sight!

Mineral Data
What's on the rock

Demantoid

Variety Of: 

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Hardness: 
6.5 - 7.0