Synonyms: iron quartz
Chemical composition: SiO2
Characteristics: cryptocrystalline quartz, usually strips or spots was Streak's massive, depending on the mineral content of different elements showed a variety of colors, such as Ming Hung,dark red , brown red, brown black, green, gray and so on. And brittle, no cleavage, conchoidal fracture was, a waxy and shiny glass, opaque, hardness 6.5 to 7, the proportion of 2.6 ~ 3.5.
Occurrence: the case of silicate minerals, from a large number of small granular hematite or black flint, etc.. Often contain hematite and red multi-show. Taiwan Biyu produced, depending on color and streak, can be divided into red, yellow, bloodshot, skin, etc., due to poor light transmission with chalcedony distinction.
Uses: decorations, carvings, Ornamental Stones, who can be used for high quality semi-precious stones.
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