Remove Doubts by Madam Yan Haemachates Mean the Red Chalcedony too?
阎女士释疑——血玉髓就是红玉髓吗？
2
Budaoweng has two kinds, one is hydrogrossular, the other is chalcedony-opal.
不倒翁有两种，一种为水钙铝榴石玉，另一种为玉髓蛋白石玉。
3
Blue chaleedony is one of the most precious gemstones in Taiwan, The most popular imitations of blue chalcedony in Taiwan market are dyed chalcedony, dyed quartzite and blue opal.