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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 2304 drdavidanderson 15-Feb-18 18:35
Re: Possible Hongshan currency - pseudoturquoise discs 455 Wheeler 15-Feb-18 23:49
Re: Possible Hongshan currency - pseudoturquoise discs 458 drdavidanderson 16-Feb-18 08:35
Re: Possible Hongshan currency - pseudoturquoise discs 443 Andrew_W 16-Feb-18 20:18
Re: Possible Hongshan currency - pseudoturquoise discs 460 drdavidanderson 17-Feb-18 20:52
Re: Possible Hongshan currency - pseudoturquoise discs 466 Wheeler 17-Feb-18 12:01
Re: Possible Hongshan currency - pseudoturquoise discs 492 drew 18-Feb-18 00:46
Re: Possible Hongshan currency - pseudoturquoise discs 458 drdavidanderson 18-Feb-18 05:16
Re: Possible Hongshan currency - pseudoturquoise discs 462 drew 18-Feb-18 21:29
Re: Possible Hongshan currency - pseudoturquoise discs 498 drdavidanderson 19-Feb-18 17:29
Re: Possible Hongshan currency - pseudoturquoise discs 444 drew 20-Feb-18 01:54
lol 483 drew 20-Feb-18 02:13
Re: lol 421 drdavidanderson 20-Feb-18 15:42
Re: lol 457 drew 20-Feb-18 23:38
Re: lol 488 Wheeler 21-Feb-18 01:30
Re: Chunkey 454 drew 21-Feb-18 06:21
Re: Chunkey 442 drdavidanderson 21-Feb-18 09:23
Re: Chunkey 471 Wheeler 21-Feb-18 12:19
Re: Chunkey 435 drdavidanderson 21-Feb-18 14:09
Re: Possible Hongshan currency - pseudoturquoise discs 487 drew 20-Feb-18 02:30
Re: Possible Hongshan currency - pseudoturquoise discs 458 drew 21-Feb-18 23:50
history of mahjong... 467 drew 22-Feb-18 00:31
Re: Possible Hongshan currency - pseudoturquoise discs 467 drdavidanderson 22-Feb-18 05:38
Re: Possible Hongshan currency - pseudoturquoise discs 464 Wheeler 22-Feb-18 11:16
Re: Possible Hongshan currency - pseudoturquoise discs 483 drew 22-Feb-18 23:45
ps 455 drew 23-Feb-18 00:03
Re: Possible Hongshan currency - pseudoturquoise discs 816 drdavidanderson 23-Feb-18 08:01


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