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Newest topics and users posts
23 Oct-06:26:24 Re: glass or obsidant....in pink (James Catmur)
23 Oct-05:55:16 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
23 Oct-04:59:39 Re: crystal cluster?? (Bob Harman)
23 Oct-04:47:47 Re: glass or obsidant....in pink (Steveb)
23 Oct-03:11:47 Re: glass or obsidant....in pink (Tobi)
23 Oct-02:50:22 Re: crystal cluster?? (Jlea80)
23 Oct-02:47:21 Glass or obsidant....in pink (Norman Edwardwar)
23 Oct-01:21:27 Re: new generation for picture - ploum (Tobi)
23 Oct-01:13:49 Re: new mineral discovery (Tobi)
23 Oct-01:07:19 Re: don lum collection (Tobi)
23 Oct-01:03:34 Re: crystal cluster?? (Tobi)
23 Oct-00:27:53 Munich show (mineralientage) 2019 - early (Jordi Fabre)
22 Oct-23:54:28 Re: crystal cluster?? (Jlea80)
22 Oct-21:25:02 Re: don lum collection (Don Lum)
22 Oct-20:17:40 Re: new mineral discovery (Rickymactal)
22 Oct-20:13:53 Re: new mineral discovery (Kevin Conroy)
22 Oct-19:09:28 Re: new mineral discovery (Rickymactal)
22 Oct-18:09:46 Re: new mineral discovery (Rickymactal)
22 Oct-18:07:06 Re: new mineral discovery (Rickymactal)
22 Oct-16:36:38 Re: new generation for picture - ploum (Ploum)
22 Oct-15:08:03 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
22 Oct-11:52:59 Re: the mizunaka collection (Am Mizunaka)
22 Oct-09:53:49 Re: older specimens with poor and sometimes mixed up labels (Pete Richards)
22 Oct-08:43:12 Re: older specimens with poor and sometimes mixed up labels (Michael Shaw)
22 Oct-08:32:55 Re: older specimens with poor and sometimes mixed up labels (Kevin Conroy)

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  Topic: Pyrrhotite Herja?
Bob Morgan

Replies: 5
Views: 284

PostForum: What is it? - Where is it from?   Posted: Oct 20, 2019 12:15   Subject: Re: Pyrrhotite Herja?
Yep, Pyrite,
I venture the guess of Huanzala Mine in Peru for the locality. I have a couple of pieces showing a similar habit.
  Topic: Possible Belowda-law twin of quartz
Bob Morgan

Replies: 1
Views: 277

PostForum: Minerals and Mineralogy   Posted: Oct 13, 2019 15:44   Subject: Re: Possible Belowda-law twin of quartz
If this is indeed a twin on the 302 with a 55o 23’ c-axis angle, it will be the third I'm aware of. The first was brought from Brasil years a go by Richard Gaines and written up by Frondel. The secon ...
  Topic: A mineralogical trip through the states of USA - New Jersey
Bob Morgan

Replies: 43
Views: 57375

PostForum: A mineralogical trip through the states of USA   Posted: Oct 04, 2019 15:15   Subject: Re: A mineralogical trip through the states of USA - New Jersey
On the Moore's Station piece: The pyrite appears to be in lines. Is that so, and are those lines on edges of the calcite crystals?
  Topic: Help needed for locations
Bob Morgan

Replies: 19
Views: 1362

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 28, 2019 13:21   Subject: Re: Help needed for locations
With regard to the pyrite, what is the matrix like? Is it more like hardened clay or something else? The cracked crystals seem to indicate stronger pressure and harder matrix.
I've looked through the ...
  Topic: Help
Bob Morgan

Replies: 12
Views: 936

PostForum: What is it? - Where is it from?   Posted: Jul 25, 2019 15:24   Subject: Re: Help
Where did you find it. Was it around clay soil? If so, it may be a concretion like an Indian paint pot. That fits with the softness.
  Topic: Is this a twin?
Bob Morgan

Replies: 28
Views: 23783

PostForum: The Ten Thousand Club   Posted: May 15, 2019 16:45   Subject: Re: Is this a twin?
Kevin,
You got the point. With only s faces they wouldn't look different. They could be either.

Duncan,
As regards to Dauphene twinning revealed by light etching - it's interesting that when a t ...
  Topic: Is this a twin?
Bob Morgan

Replies: 28
Views: 23783

PostForum: The Ten Thousand Club   Posted: May 15, 2019 12:01   Subject: Re: Is this a twin?
Duncan,
I just saw your second photo. That's definitely the sign of Dauphene Law twinning.
  Topic: Is this a twin?
Bob Morgan

Replies: 28
Views: 23783

PostForum: The Ten Thousand Club   Posted: May 15, 2019 11:38   Subject: Re: Is this a twin?
I doubt very much that this is a Brazil law twin. The two faces you propose as x faces are actually s faces. (See Drawing) They look like x faces because they are adjacent to large steep rhombohedral ...
  Topic: Don Lum Collection
Bob Morgan

Replies: 1443
Views: 1016642

PostForum: Collection photos and Collector's page   Posted: May 07, 2019 16:23   Subject: Re: Don Lum Collection
Looking through pics on mindat there are coatings of quartz and calcite. Yours looks like neither. The calcite coatings are of scalenahedral shaped crystals. Yours looks like simple rhombs.
Since bot ...
  Topic: Gypsum orphan
Bob Morgan

Replies: 5
Views: 937

PostForum: What is it? - Where is it from?   Posted: May 03, 2019 19:05   Subject: Re: Gypsum orphan
Thanks, That explains why I couldn't find a town with that name.
It's delightful to learn a new term for twin.
Bob
  Topic: Gypsum orphan
Bob Morgan

Replies: 5
Views: 937

PostForum: What is it? - Where is it from?   Posted: May 03, 2019 17:20   Subject: Gypsum orphan
I recently obtained a gypsum twin from an old collection with a lot of European specimens. The dealer had no more knowledge than was on the label, which I cannot interpret. Bolognese is clear: but the ...
  Topic: Two orphan spinels
Bob Morgan

Replies: 8
Views: 1476

PostForum: Mines and Mineral Localities   Posted: May 01, 2019 07:27   Subject: Re: Two orphan spinels
Thanks John. It's nice to clear up these things.
  Topic: Two orphan spinels
Bob Morgan

Replies: 8
Views: 1476

PostForum: Mines and Mineral Localities   Posted: Apr 29, 2019 21:12   Subject: Re: Two orphan spinels
After seeing your first spinel in Rochester, I came home and looked at mine. I purchased one from Jewell Tunnel identified as from the Neil Ydren collection. The only locality information was "Ma ...
  Topic: Pyrite modified with Diploid-high millers?
Bob Morgan

Replies: 4
Views: 1234

PostForum: Minerals and Mineralogy   Posted: Mar 15, 2019 11:54   Subject: Re: Pyrite modified with Diploid-high millers?
I'll add my two cents worth to this.
The features - pits and striations are in trapezohedral and trisoctahedral orientations. they alternate with each other to make the hexaqonal pit in the center. ...
  Topic: Trying to identify the habit of this Fluorite.
Bob Morgan

Replies: 11
Views: 1312

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 10, 2019 20:53   Subject: Re: Trying to identify the habit of this Fluorite.
So glad to hear of another cataloging their collection's crystal forms and faces. For help with pyrite ones go to the Rochester Academy of Science website at
https://www.rasny.org/mineral/
(link no ...
  Topic: Tucson Show 2019
Bob Morgan

Replies: 127
Views: 55440

PostForum: News about shows   Posted: Jan 30, 2019 16:09   Subject: Re: Tucson Show 2019
I love the pictures of those wonderful crystals and will enjoy seeing them this year at Tucson. Alas! my wallet limits my enjoyment to observing.
I used to try to collect 'perfect' crystals. They are ...
  Topic: Rarest quartz twins with inclined axes C
Bob Morgan

Replies: 42
Views: 20472

PostForum: Minerals and Mineralogy   Posted: Nov 09, 2018 17:51   Subject: Re: Rarest quartz twins with inclined axes C
At the risk of adding confusion to this discussion, I prefer to call what Pete calls auto-epitaxy deposition twins. This is where a smaller crystal develops on an already established larger crystal an ...
  Topic: Munich Show (Mineralientage) 2018
Bob Morgan

Replies: 40
Views: 19431

PostForum: News about shows   Posted: Oct 25, 2018 08:47   Subject: Re: Munich Show (Mineralientage) 2018
I'll be there and hope to meet others interested in crystal morphology, twinning, epitaxy, and such. I'll be wearing a bright blueish-teal shirt. Please approach and speak.
Bob
  Topic: Weird face in quartz
Bob Morgan

Replies: 31
Views: 17843

PostForum: Minerals and Mineralogy   Posted: Oct 01, 2018 23:14   Subject: Re: Weird face in quartz
This latest submission refers back to Josele's crystal https://www.mineral-forum.com/message-board/download.php?id=74577 in https://www.mineral-forum.com/message-board/viewtopic.php?p=54392#54392 that ...
  Topic: Weird face in quartz
Bob Morgan

Replies: 31
Views: 17843

PostForum: Minerals and Mineralogy   Posted: Oct 01, 2018 23:09   Subject: Re: Weird face in quartz
In the photo in the upper left, the long thin reflection appears to be the 's' face. If so, on the other side of the adjoining indefinite (striated) area in between is probably a (212) sliver. As to ...
 
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