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

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.