Synonyms: Taiwan Sapphire
Chemical composition: SiO2
Characteristics: Aphanitic, the proportion due to low water content than quartz for 2.58 ~ 2.64, hardness 7, have waxy luster. Produced by the province was due to the blue copper containing 0.01 ~ 0.02% due to the uranium associated with micro-0.002 ~ 0.035%, so have the radioactive reaction, some scholars said the case of silicon malachite (Chrysocolla).
Occurrence: the quality produced in the andesite agglomerate filling irregular, the pulse was irregular-shaped distribution, mainly by radiation fibrous or granular ball composed of pulp stones. Often containing a small amount of chlorite, opal and natural copper.
Uses: Gemstone (semi-precious stones), rings, earrings, brooches, necklaces and other ornaments, or the Ornamental Stones.
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