2007•Journal of Gems & GemmologyRequires access
Study on "Di" of Chicken-Blood Stone from Changhua and Effective Factors of Quality Grading
Fang Biao
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Abstract
Based on the field geological observation, the different kinds of of chicken-blood stones from Changhua are tested by using the means as conventional gemmological methods,XRD and IR. The results show that the quality of of chicken-blood stones from Changhua is closely related to the compositions and the content of the main mineral. The higher content of dickite and the better order degree of the structure could result in the better quality of Di.Alunite added in the chicken-blood stones could reduce the transparency of while the hardness increases. From the Ruan Di to the Gang Di, the content of alunite and quartz increases. When the content of quartz is over 25%, the of chicken-blood stones from Changhua belongs to the Ying Di.