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Search found 5 matches |
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Topic: Is this a twin? | |
PMH Replies: 28 Views: 75015 |
Forum: Minerals and Mineralogy Posted: Jan 20, 2012 14:49 Subject: Re: Is this a twin? |
Thanks again. | |
Topic: Is this a twin? | |
PMH Replies: 28 Views: 75015 |
Forum: Minerals and Mineralogy Posted: Jan 20, 2012 14:08 Subject: Re: Is this a twin? |
(I got into this when I was trying to understand why two (adjacent) (prism) faces of an amazonite xl showed "reentrant" angles, which I've taken to imply (suggest?) twinning.
...although ... |
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Topic: Is this a twin? | |
PMH Replies: 28 Views: 75015 |
Forum: Minerals and Mineralogy Posted: Jan 20, 2012 14:02 Subject: Re: Is this a twin? |
Thanks again!
You're obviously right about the xl of this thread. ...something that I should have noticed immediately myself I guess I must've taken the Page that I saw this on as truth - w/o a ... |
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Topic: Is this a twin? | |
PMH Replies: 28 Views: 75015 |
Forum: Minerals and Mineralogy Posted: Jan 20, 2012 10:02 Subject: Re: Is this a twin? |
Very cool! thanks
I never learned - or heard of (?) - that twinning always increases symmetry. (& never managed to get classes, point groups , etc. into my head) (& I'm a mathematician!) ... |
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Topic: Is this a twin? | |
PMH Replies: 28 Views: 75015 |
Forum: Minerals and Mineralogy Posted: Jan 19, 2012 12:47 Subject: Re: Is this a twin? |
I was just looking around researching twins a little, and came across this..
https://www.tulane.edu/~sanelson/eens211/twinning.htm (link normalized by FMF) ..which looks an awful lot like the aqu ... |
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