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Newest topics and users posts
27 Mar-19:47:08 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Pete Richards)
27 Mar-16:15:44 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-15:18:59 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Alfredo)
27 Mar-14:39:29 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-05:21:48 Re: the mim museum in beirut, lebanon (Mim Museum)
27 Mar-05:03:26 Re: trying to find information on rose/pink quartz and tourmaline associations. (Ning)
27 Mar-02:39:50 Re: the mim museum in beirut, lebanon (Tobi)
27 Mar-00:23:28 Re: collection of volkmar stingl (Volkmar Stingl)
26 Mar-00:53:41 Re: collection of volkmar stingl (Volkmar Stingl)
25 Mar-13:32:10 Re: collection of michael shaw (Michael Shaw)
25 Mar-00:25:58 The mizunaka collection - quartz (Am Mizunaka)
23 Mar-13:35:22 Re: collection of firmo espinar (Firmo Espinar)
22 Mar-08:32:28 Re: collection of michael shaw (Michael Shaw)
22 Mar-04:20:41 Re: the mim museum in beirut, lebanon (Mim Museum)
21 Mar-22:49:19 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:47:40 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:45:25 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-15:34:23 Re: the mizunaka collection - quartz (Am Mizunaka)
21 Mar-14:35:08 Re: jim’s mineral collection (Jim Wilkinson)
21 Mar-14:15:36 The 4th phoenix heritage mineral show (phms) hosted by mineralogical society of arizona (m (Chris Whitney-smith)
21 Mar-04:36:10 Re: the mizunaka collection (Tobi)
21 Mar-04:11:47 Re: jim’s mineral collection (James Catmur)
20 Mar-23:34:15 The mizunaka collection - quartz (Am Mizunaka)
20 Mar-18:13:16 Re: jim’s mineral collection (Jim Wilkinson)
20 Mar-14:06:43 Re: dry gill mine, caldbeck fells, cumbria, uk (Forrestblyth)

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  Topic: Is this a twin?
PMH

Replies: 28
Views: 75015

PostForum: 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

PostForum: 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 ...
  Topic: Is this a twin?
PMH

Replies: 28
Views: 75015

PostForum: 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 ...
  Topic: Is this a twin?
PMH

Replies: 28
Views: 75015

PostForum: 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!) ...
  Topic: Is this a twin?
PMH

Replies: 28
Views: 75015

PostForum: 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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