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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 347 matches |
| Author | Message |
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 Topic: Calcite Forms - (4) |
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| Ru Smith Replies: 163 Views: 311153 |
 Forum: Featured Columns of FMF Posted: Oct 05, 2013 13:19 Subject: Re: A couple of American Calcite Twins |
| I think I'm starting to "get" the different classes of calcite twin.
Here's an old page of drawings from Dana and a selection of four twins to represent the four classes (if I've underst ... |
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| Topic: Don Lum Collection |
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| Ru Smith Replies: 2174 Views: 2121603 |
Forum: Collection photos and Collector's page Posted: Oct 05, 2013 11:04 Subject: Re: Don Lum Collection |
| Love the orange tinge of the hemimorphite. It's a wonderfully colourful group of Mexican minerals that you show. | |
| Topic: Spinel twins |
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| Ru Smith Replies: 54 Views: 114865 |
Forum: Minerals and Mineralogy Posted: Oct 04, 2013 18:32 Subject: Re: Spinel twins |
| While I have the camera out - a pretty spinel twin of diamond. | |
| Topic: Calcite Forms - (4) |
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| Ru Smith Replies: 163 Views: 311153 |
Forum: Featured Columns of FMF Posted: Oct 04, 2013 18:28 Subject: Re: A couple of American Calcite Twins |
| Thanks Roger,
Here's a similar one from Dalnegorsk and also another view of the more common habit in the Meikle example, with twin rotated to show composition plane horizontal. |
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| Topic: A mineralogical trip through the regions of the UK - England / Cumbria |
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| Ru Smith Replies: 141 Views: 211138 |
Forum: A mineralogical trip through the regions of the UK Posted: Oct 04, 2013 18:00 Subject: Re: A mineralogical trip through the regions of the UK - England / Cumbria |
| These Rodderup/Rotherhope Fell Mine fluorites are very beautiful. I also like the calcites from there. | |
| Topic: Spinel twins |
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| Ru Smith Replies: 54 Views: 114865 |
Forum: Minerals and Mineralogy Posted: Oct 03, 2013 22:31 Subject: Re: Spinel twins |
| Thanks Roger. As usual though it's still not as ideal as in the drawing. Here I've rotated a photo to compare with the old Dana drawing. | |
| Topic: Calcite Forms - (4) |
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| Ru Smith Replies: 163 Views: 311153 |
Forum: Featured Columns of FMF Posted: Oct 03, 2013 21:33 Subject: A couple of American Calcite Twins |
| I particularly like the Meikle example. | |
| Topic: A mineralogical trip through the regions of the UK - England / Cumbria |
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| Ru Smith Replies: 141 Views: 211138 |
Forum: A mineralogical trip through the regions of the UK Posted: Oct 03, 2013 21:26 Subject: Re: A mineralogical trip through the regions of the UK - England / Cumbria |
| Something tiny from Cumbria. | |
| Topic: A mineralogical trip through the regions of the UK - England / Cornwall |
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| Ru Smith Replies: 76 Views: 133776 |
Forum: A mineralogical trip through the regions of the UK Posted: Oct 03, 2013 21:23 Subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
| Fine examples, Ian. | |
| Topic: Spinel twins |
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| Ru Smith Replies: 54 Views: 114865 |
Forum: Minerals and Mineralogy Posted: Oct 01, 2013 21:35 Subject: Re: Spinel twins |
| Here's an interesting cyclic arrangement of spinel twins from Myanmar. | |
| Topic: Galena "homoepitaxy" |
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| Ru Smith Replies: 2 Views: 6594 |
Forum: Minerals and Mineralogy Posted: Sep 29, 2013 23:05 Subject: Re: Galena "homoepitaxy" |
| Homoepitaxy it is then! | |
| Topic: Calcite Forms - (4) |
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| Ru Smith Replies: 163 Views: 311153 |
Forum: Featured Columns of FMF Posted: Sep 29, 2013 22:57 Subject: Re: Calcite Forms - (4) |
| Two of several beautiful twins to 65 mm on 26 cm matrix. | |
| Topic: My modest collection of minerals / micro photos ... |
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| Ru Smith Replies: 59 Views: 114774 |
Forum: Micros & Macros - Images of Minerals Posted: Sep 29, 2013 22:48 Subject: Re: My modest collection of minerals / micro photos ... |
| My favourite: the cacoxenite from La Paloma. | |
| Topic: Galena "homoepitaxy" |
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| Ru Smith Replies: 2 Views: 6594 |
Forum: Minerals and Mineralogy Posted: Sep 28, 2013 18:29 Subject: Galena "homoepitaxy" |
| This is a fun little example of epitaxy - galena octahedra on corners and sides of an earlier cube. | |
| Topic: A mineralogical trip through the regions of the UK - England / Cornwall |
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| Ru Smith Replies: 76 Views: 133776 |
Forum: A mineralogical trip through the regions of the UK Posted: Sep 28, 2013 18:21 Subject: Re: A mineralogical trip through the regions of the UK - England / Cornwall |
| Fine old tetrahedrite. | |
| Topic: A mineralogical trip through the regions of the UK - England / Somerset |
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| Ru Smith Replies: 5 Views: 14183 |
Forum: A mineralogical trip through the regions of the UK Posted: Sep 28, 2013 17:33 Subject: Re: A mineralogical trip through the regions of the UK - England / Somerset |
| Small twinned calcite. | |
| Topic: Spinel twins |
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| Ru Smith Replies: 54 Views: 114865 |
Forum: Minerals and Mineralogy Posted: Sep 27, 2013 12:59 Subject: Re: Spinel twins |
| Greetings all,
I just took another look at the Naica fluorite twin, here orientating it with twinning axis vertical and playing with the lighting to highlight re-entrants. I need to try again given ... |
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| Topic: Tetrahedron [111] penetration twin |
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| Ru Smith Replies: 17 Views: 70357 |
Forum: Minerals and Mineralogy Posted: Aug 25, 2013 21:48 Subject: Re: Tetrahedron |
| Basically correct, Josele. Here's a sketch looking down the twinning axis from the pointy end. I've drawn over the actual faces and edges and then extrapolated where the crystal contacts the matrix. O ... | |
| Topic: How many different habits of chalcocite twins are there? |
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| Ru Smith Replies: 5 Views: 11125 |
Forum: Minerals and Mineralogy Posted: Aug 25, 2013 21:38 Subject: Re: How many different habits of chalcocite twins are there? |
| just another little Cornish specimen. | |
| Topic: My modest collection of minerals / micro photos ... |
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| Ru Smith Replies: 59 Views: 114774 |
Forum: Micros & Macros - Images of Minerals Posted: Aug 24, 2013 20:49 Subject: Re: My modest collection of minerals / micro photos ... |
| Vivid! | |
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