Semi-nephrite Bi disk from China of the Han dynasty (206 BC-220 AD)

• The custom made base is included
• The disk has a dotted surface, also called "rice grain pattern" and is partly calcified

• This object has recently be tested by the Netherlands Gem Laboratory with the provisional result that (picture of letter included): Although the main mineral content of the described object is tremolite, the observed texture appears to provent a straightforward identification as being nephrite jade. Nodular or angular clasts of nephrite appear to be present in a matric, in which foliation is present as well. A this-section of this material would be needed to get more detailed information on the texture and relation with mineral content. Based on the current data, a provisional conclusion is that the object consists of a metamorphic rock, which could be classified as semi-nephrite/tremolite schist.
• For more information about the Netherlands Gem Laboratory, follow link: https://www.naturalis.nl/en/science/netherlands-gem-laboratory

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