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The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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| Search found 41 matches |
| Author | Message |
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 Topic: Collection Macros |
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| Jim Robison Replies: 31 Views: 36984 |
 Forum: 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 |
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| Jim Robison Replies: 501 Views: 561201 |
Forum: 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 ... |
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| Topic: Tucson Show 2018 |
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| Jim Robison Replies: 158 Views: 251733 |
Forum: 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 ... |
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| Topic: Tucson Show 2018 |
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| Jim Robison Replies: 158 Views: 251733 |
Forum: 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 ... |
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| Topic: Concrete as a mineral |
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| Jim Robison Replies: 6 Views: 7515 |
Forum: 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 |
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| Jim Robison Replies: 19 Views: 25575 |
Forum: 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 |
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| Jim Robison Replies: 24 Views: 35287 |
Forum: 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 |
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| Jim Robison Replies: 8 Views: 22473 |
Forum: 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 |
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| Jim Robison Replies: 12 Views: 22099 |
Forum: 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 ... |
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| Topic: Minerals and the Origins of Life: the key roles of apatite and struvite |
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| Jim Robison Replies: 9 Views: 16547 |
Forum: 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 ... |
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| Topic: Terra Mineralia |
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| Jim Robison Replies: 18 Views: 27548 |
Forum: 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 |
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| Jim Robison Replies: 2 Views: 13257 |
Forum: 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 |
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| Jim Robison Replies: 2418 Views: 2173487 |
Forum: 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 ... |
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| Topic: The Mizunaka Collection |
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| Jim Robison Replies: 2418 Views: 2173487 |
Forum: 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 |
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| Jim Robison Replies: 2418 Views: 2173487 |
Forum: 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 ... |
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| Topic: "What's in a name?" - thoughts on the subject of provenance |
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| Jim Robison Replies: 28 Views: 44702 |
Forum: 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 ... |
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| Topic: Making brown vanadinite red again |
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| Jim Robison Replies: 9 Views: 16210 |
Forum: 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 |
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| Jim Robison Replies: 105 Views: 152367 |
Forum: 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 |
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| Jim Robison Replies: 15 Views: 18840 |
Forum: 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 |
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| Jim Robison Replies: 13 Views: 21334 |
Forum: 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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