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Blue Chalcedony

Tags: mineral

Name: Blue Chalcedony
Locality: Tungho, Taitung, Taiwan
Size & weight: 10.200g
Chemical Class: Silicate
Chemical Formula: SiO2
Crystal System: Hexaqonal system
Hardness: 7
Fracture: Conchoidal
Cleavage: Poor
Chromatic: White
Common Appearance: Massive, mammiform or botryoidal forms
Luster: Waxy Luster
Color: White, blue, red, green, brown, black
Specific Gravity: 2.58 - 2.64
Blue chalcedony from Taiwan contains chrysocolla and is blue in color, for this reason it is called Taiwan sapphire. Thus far, it is the highest priced gemstone from Taiwan. It is categorized into sky-blue from the Paliwan mountains, marine blue from Dulan mountains, and emerald green from Chengguangao mountains.
NTU Digital Archives of Geosciences Department, National Taiwan University