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Newest topics and users posts
07 Aug-17:26:18 Popular minerals - twinned quartz (japan law twin) from colombia (Jordi Fabre)
07 Aug-14:43:35 Re: don lum collection (Don Lum)
07 Aug-14:14:04 Re: collection of michael shaw (Michael Shaw)
06 Aug-13:16:17 Re: don lum collection (Don Lum)
06 Aug-11:25:10 Re: the mim museum in beirut, lebanon (Fiebre Verde)
06 Aug-10:17:03 Re: about cyclic twinning - (5) (Peter Lemkin)
06 Aug-10:08:48 Re: the mim museum in beirut, lebanon (Peter Lemkin)
06 Aug-07:21:56 Re: the mim museum in beirut, lebanon (Mim Museum)
05 Aug-22:48:29 Re: about cyclic twinning - (5) (Kevin Conroy)
05 Aug-16:56:30 Popular minerals - fluorapatite from panasqueira, portugal (Jordi Fabre)
05 Aug-16:08:40 Re: the mim museum in beirut, lebanon (David K. Joyce)
05 Aug-14:11:56 Re: about cyclic twinning - (5) (Rutilefox)
05 Aug-12:58:14 Re: james sowerby's illustrations (Max Merlo)
05 Aug-12:09:15 Re: the mim museum in beirut, lebanon (Rweaver)
05 Aug-10:39:40 Re: the mim museum in beirut, lebanon - solidarity with the lebanese people! (Kevin Schofield)
05 Aug-10:28:26 Re: the mim museum in beirut, lebanon (Peter Lemkin)
05 Aug-03:56:22 The mim museum in beirut, lebanon - solidarity with the lebanese people! (Jordi Fabre)
04 Aug-15:56:58 Re: found in iowa please identify (Firmo Espinar)
04 Aug-15:37:15 Re: found in iowa please identify (James Catmur)
04 Aug-15:34:48 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
04 Aug-12:13:42 Found in iowa please identify (Leone1986)
04 Aug-05:49:12 How to collect in an "apartment for sale". (Sante Celiberti)
04 Aug-03:59:43 Re: lonsdaleite? (Alfredo)
03 Aug-18:08:22 Re: lonsdaleite? (Pete Richards)
03 Aug-16:18:49 Re: lonsdaleite? (Kevin Conroy)

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  Topic: Collection Macros
Jim Robison

Replies: 31
Views: 17015

PostForum: Micros & Macros - Images of Minerals   Posted: Aug 05, 2018 17:33   Subject: Re: Collection Macros
An important clue is the difference in shape between the two minerals. Fluorite is aa cubic mineral, which among other things mean the corners of natural crystals have a square shape or a variation on ...
  Topic: Presentation of new members - Reference Thread
Jim Robison

Replies: 425
Views: 283698

PostForum: Off-Topic and Introductions   Posted: Feb 07, 2018 14:21   Subject: Re: Presentation of new members - Kevin Schofield from Houston, Texas
Kevin

I am a self described 'carbonate freak', focusing from 1988 to 2000 on all carbonates, and thereafter smithsonite and dolomite from Tsumeb exclusively. This is a great area of collection foc ...
  Topic: Tucson Show 2018
Jim Robison

Replies: 158
Views: 140591

PostForum: News about shows   Posted: Feb 02, 2018 15:24   Subject: Re: Tucson Show 2018
Thanks John
Do you know of other instances where the quartz/cristobalite associations occur? I'd be interested to know, in general, the environments these these two minerals, and trydimite, occur in ...
  Topic: Tucson Show 2018
Jim Robison

Replies: 158
Views: 140591

PostForum: News about shows   Posted: Jan 30, 2018 19:13   Subject: Re: Tucson Show 2018 - Some photos from John White
A large group of amethyst from Rio Grande do Sul, Brazil, with inclusions of cristobalite.
John, I don't know the silicates at all well, but have long been under the impression that cristabolite and ...
  Topic: Concrete as a mineral
Jim Robison

Replies: 6
Views: 4109

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2018 16:43   Subject: Re: Concrete as a mineral
A mineral has a specific chemical formula and composition. While concrete is an aggregate of several types of rocks and processed lime, with water, it is rock like in character. Generally speaking, a ...
  Topic: Quartzite - 2018
Jim Robison

Replies: 19
Views: 14255

PostForum: Mineral Shows   Posted: Jan 15, 2018 17:34   Subject: Re: Quartzite - 2018
As an Ex Arizona resident who drove through Quartzite many times on the way to and from Los Angeles I saw Quartzite all through the year. Only stopped there to get gas and something to eat. Quarzite h ...
  Topic: Collecting focuses and how they can change
Jim Robison

Replies: 24
Views: 20109

PostForum: Minerals and Mineralogy   Posted: Oct 22, 2017 21:33   Subject: Re: Collecting focuses and how they can change
For years I was unfocused (I thought) until a symposium where the theme was carbonates. By the time I had pulled stuff from my case and flats, about 70% of the collection was on the table. So I decide ...
  Topic: Art Soregaroli's passing
Jim Robison

Replies: 8
Views: 14189

PostForum: In Memoriam   Posted: Oct 20, 2017 01:22   Subject: Re: Art Soregaroli's passing
Peter and others, thanks for sharing memories of one of the truly great people I have known. I too knew it was coming, and the pleasure of your recollections captures the man perfectly. I got to know ...
  Topic: The Tsumeb Mine
Jim Robison

Replies: 12
Views: 13166

PostForum: Mines and Mineral Localities   Posted: May 12, 2017 16:43   Subject: Re: The Tsumeb Mine
Hi Heimo, far from ugly:-) A whole little mountain full of pockets.

Helmo I agree with Pierre . Ugly is in the eye of the beholder. I used to belong to an organization that at it's annual we ...
  Topic: Minerals and the Origins of Life: the key roles of apatite and struvite
Jim Robison

Replies: 9
Views: 10473

PostForum: Minerals and Mineralogy   Posted: Aug 27, 2016 16:21   Subject: Re: Minerals and the Origins of Life: the key roles of apatite and struvite
Cesar,
Many of us probably did not comment because our knowledge of such topics is either very incomplete or (in my case) non-existent!!! I have always valued your contributions to FMF. and not bein ...
  Topic: Terra Mineralia
Jim Robison

Replies: 18
Views: 14562

PostForum: Freiberg Museums   Posted: Jul 15, 2016 13:07   Subject: Re: Terra Mineralia
Regarding the habit of smithsonite noted above. This is a classic Tsumeb habit. I have a friend with a specimen holding crystals over 10cm long. Stunning piece. In my large Tsumeb smithsonite collecti ...
  Topic: password changing
Jim Robison

Replies: 2
Views: 9739

PostForum: Comments & Suggestions   Posted: Jun 26, 2016 18:52   Subject: password changing
I want to update my password, but can't figure out where in the site to do this. I suspect it is someplace really obvious, but sure don't see it. Help please!
  Topic: The Mizunaka Collection
Jim Robison

Replies: 1576
Views: 1043368

PostForum: Collection photos and Collector's page   Posted: May 04, 2014 21:48   Subject: Re: The Mizunaka Collection
Mike

A simple scratch test with a steel needle in an out of the way place on the clear crystals would give a good indicator on the quartz versus smithsonite question.

I've been reminded by a goo ...
  Topic: The Mizunaka Collection
Jim Robison

Replies: 1576
Views: 1043368

PostForum: Collection photos and Collector's page   Posted: May 03, 2014 22:47   Subject: Re: The Mizunaka Collection
Mike Your excellent new pics have a puzzle or two in them. On the second shot, with the layered material it seems most likely you are looking at dolomite. The first pic has an anomaly in that the ...
  Topic: The Mizunaka Collection
Jim Robison

Replies: 1576
Views: 1043368

PostForum: Collection photos and Collector's page   Posted: May 03, 2014 19:54   Subject: Re: The Mizunaka Collection
AM

Your latest Tsumeb smithsonite is beyond lovely. Very nice indeed. The yellow bleb inclusions are commonly attributed to either cadmium or greenockite (cadmium sulfide). Unfortunately, there is ...
  Topic: "What's in a name?" - thoughts on the subject of provenance
Jim Robison

Replies: 28
Views: 30070

PostForum: Minerals and Mineralogy   Posted: Nov 03, 2013 17:22   Subject: Re: "What's in a name?" - thoughts on the subject of provenance
I agree with most of what Tracy said so clearly. Provenance for current living collectors doesn't do a lot for me. Same with a lot of old collections. But there are a couple of exceptions.

The fir ...
  Topic: Making brown vanadinite red again
Jim Robison

Replies: 9
Views: 11227

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Oct 28, 2013 14:10   Subject: Re: Making brown vanadinite red again
I recall that on MIndat sometime back there was an extensive discussion (maybe several) on light sensitive minerals. In one of the threads there was a compilation of these minerals, including many tha ...
  Topic: New Paintings 2013
Jim Robison

Replies: 105
Views: 101815

PostForum: Mineral Art and Artists   Posted: Mar 17, 2013 14:56   Subject: Re: New Paintings 2013
Day by day you give us wonderful paintings to enjoy. Usually nobody makes a comment, but I believe I speak for a lot of viewers when I say Thanks and Well Done for the many excellent paintings you sho ...
  Topic: Measuring mineral specimens
Jim Robison

Replies: 15
Views: 11512

PostForum: Minerals and Mineralogy   Posted: Feb 02, 2013 19:06   Subject: Re: Measuring mineral specimens
Time to be the grumpy old man. As an engineer I am often frustrated when people have a misunderstanding about the difference between accuracy and precision. The latter is often cited to ridiculous ext ...
  Topic: Collection of Herman van Dennebroek
Jim Robison

Replies: 13
Views: 14356

PostForum: Collection photos and Collector's page   Posted: Jan 28, 2013 14:32   Subject: Re: Collection of Herman van Dennebroek
Herman

I'll look forward to some pictures in late February. The Tucson madness begins, and I will be down there as well, in a variety of venues. I'm exhibiting at the Main TGMS show (Colorful Carbo ...
 
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