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A number of the discs show considerable wear. When I get home tomorrow I'll look some of these out. The material is very interesting, because as far as I can see no one in China knows what it is. They just call it lin fong shi (綠松石) - ie turquoise). Some of the discs and other carvings in this material are turquoise in colour, some a darker blue, and others are greenish. This may well depend on the crystal size, which in turn would depend on the temperature it was heated to, and the subsequent rate of cooling. Also when I looked at them there seemed to be two types of micro-crystals, one that transmitted red light but not blue, and the other was white and opaque. (This was only evident at the edge of the wedge, which is one crystal thick) Presumably one calcite (calcium carbonate), and one dolomite (Calcium magnesium carbonate). The equal proportions of calcite and dolomite suggest the original rock that was heated and cooled was dolosite.

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Subject Views Written By Posted
Possible Hongshan currency - pseudoturquoise discs 1990 drdavidanderson 15-Feb-18 18:35
Re: Possible Hongshan currency - pseudoturquoise discs 360 Wheeler 15-Feb-18 23:49
Re: Possible Hongshan currency - pseudoturquoise discs 365 drdavidanderson 16-Feb-18 08:35
Re: Possible Hongshan currency - pseudoturquoise discs 351 Andrew_W 16-Feb-18 20:18
Re: Possible Hongshan currency - pseudoturquoise discs 369 drdavidanderson 17-Feb-18 20:52
Re: Possible Hongshan currency - pseudoturquoise discs 369 Wheeler 17-Feb-18 12:01
Re: Possible Hongshan currency - pseudoturquoise discs 391 drew 18-Feb-18 00:46
Re: Possible Hongshan currency - pseudoturquoise discs 367 drdavidanderson 18-Feb-18 05:16
Re: Possible Hongshan currency - pseudoturquoise discs 369 drew 18-Feb-18 21:29
Re: Possible Hongshan currency - pseudoturquoise discs 400 drdavidanderson 19-Feb-18 17:29
Re: Possible Hongshan currency - pseudoturquoise discs 350 drew 20-Feb-18 01:54
lol 385 drew 20-Feb-18 02:13
Re: lol 333 drdavidanderson 20-Feb-18 15:42
Re: lol 354 drew 20-Feb-18 23:38
Re: lol 380 Wheeler 21-Feb-18 01:30
Re: Chunkey 350 drew 21-Feb-18 06:21
Re: Chunkey 345 drdavidanderson 21-Feb-18 09:23
Re: Chunkey 377 Wheeler 21-Feb-18 12:19
Re: Chunkey 340 drdavidanderson 21-Feb-18 14:09
Re: Possible Hongshan currency - pseudoturquoise discs 391 drew 20-Feb-18 02:30
Re: Possible Hongshan currency - pseudoturquoise discs 348 drew 21-Feb-18 23:50
history of mahjong... 365 drew 22-Feb-18 00:31
Re: Possible Hongshan currency - pseudoturquoise discs 363 drdavidanderson 22-Feb-18 05:38
Re: Possible Hongshan currency - pseudoturquoise discs 366 Wheeler 22-Feb-18 11:16
Re: Possible Hongshan currency - pseudoturquoise discs 390 drew 22-Feb-18 23:45
ps 354 drew 23-Feb-18 00:03
Re: Possible Hongshan currency - pseudoturquoise discs 643 drdavidanderson 23-Feb-18 08:01


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