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A general guide for using the Forum with some rules and tips
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 297 matches |
| Author | Message |
|---|---|
 Topic: Unstable pyrite |
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| John Jaszczak Replies: 15 Views: 25869 |
 Forum: Conserving, Preparing and Cleaning Minerals Posted: Nov 13, 2019 23:53 Subject: Re: Unstable pyrite |
| I have several miniature and smaller Merelani pyrites in my collection, and have also photographed some loose larger and very lustrous crystals. Several of the miniature and smaller samples I have are ... | |
| Topic: Alfredopetrovite |
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| John Jaszczak Replies: 10 Views: 17652 |
Forum: Minerals and Mineralogy Posted: Oct 21, 2017 10:07 Subject: Re: Alfredopetrovite |
| Congratulations Alfredo! Thanks too for the additional details. | |
| Topic: Negative crystals and their formation |
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| John Jaszczak Replies: 7 Views: 14302 |
Forum: Minerals and Mineralogy Posted: Feb 12, 2017 17:01 Subject: Re: Negative crystals and their formation |
| Here are a few of my favorites from Merelani Hills, Tanzania. | |
| Topic: Merelaniite - a new mineral from the famous tanzanite deposit |
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| John Jaszczak Replies: 9 Views: 19663 |
Forum: Minerals and Mineralogy Posted: Nov 26, 2016 13:30 Subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit |
| Merelaniite whisker showing pronounced variation along its axis of its diameter. Partially protruding from calcite. | |
| Topic: Merelaniite - a new mineral from the famous tanzanite deposit |
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| John Jaszczak Replies: 9 Views: 19663 |
Forum: Minerals and Mineralogy Posted: Nov 13, 2016 22:42 Subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit |
| Hi John
The microprobe analyses give Mo4.33 Pb4.00 As0.10 V0.86 Sb0.43 Bi0.33 Mn0.05 W0.05 Cu0.03 (S14.70 Se0.30)_Sum=15 or more simply, Mo4 Pb4 V Sb S15 but it is an incommensurate structure so ... |
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| Topic: Merelaniite - a new mineral from the famous tanzanite deposit |
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| John Jaszczak Replies: 9 Views: 19663 |
Forum: Minerals and Mineralogy Posted: Nov 13, 2016 17:02 Subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit |
| Close up of the above specimen showing the partly-exposed whisker of merelaniite. | |
| Topic: Merelaniite - a new mineral from the famous tanzanite deposit |
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| John Jaszczak Replies: 9 Views: 19663 |
Forum: Minerals and Mineralogy Posted: Nov 10, 2016 14:51 Subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit |
| Very interesting and unusually large merelaniite whisker that has some layers naturally unwound and encased in calcite (white). The overall whisker is about 5 mm long. | |
| Topic: Merelaniite - a new mineral from the famous tanzanite deposit |
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| John Jaszczak Replies: 9 Views: 19663 |
Forum: Minerals and Mineralogy Posted: Nov 07, 2016 16:03 Subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit |
| SEM image of a 12-micron diameter broken whisker revealing the coiled nature of its layered structure. | |
| Topic: Merelaniite - a new mineral from the famous tanzanite deposit |
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| John Jaszczak Replies: 9 Views: 19663 |
Forum: Minerals and Mineralogy Posted: Nov 05, 2016 21:34 Subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit |
| Scanning electron microscope image of a merelaniite whisker showing the termination and also some variation in the diameter (about 24 microns maximum). (Piece of the holotype specimen.) | |
| Topic: Merelaniite - a new mineral from the famous tanzanite deposit |
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| John Jaszczak Replies: 9 Views: 19663 |
Forum: Minerals and Mineralogy Posted: Nov 05, 2016 13:03 Subject: Merelaniite - a new mineral from the famous tanzanite deposit |
| Following keen observations by Jessica Simonoff, Robert Simonoff, and Mike Wise of unusual black whiskers associated with other minerals from the tanzanite mines near Merelani, Tanzania, Jessica and M ... | |
| Topic: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
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| John Jaszczak Replies: 301 Views: 739526 |
Forum: The A.E. Seaman Mineral Museum Posted: May 11, 2016 12:16 Subject: Re: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
| Thanks Tobi.
The museum is also excited to announce the opening of its new web site. It has a wealth of information about visiting the museum, as well as extensive image galleries of some of the mu ... |
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| Topic: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
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| John Jaszczak Replies: 301 Views: 739526 |
Forum: The A.E. Seaman Mineral Museum Posted: Apr 07, 2016 14:15 Subject: Re: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
| The size and quality of the alabandite crystals from Merelani were quite a surprise to find. In addition, they have a variety of associated species, including chalcopyrite, tennantite-tetrahedrite, st ... | |
| Topic: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
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| John Jaszczak Replies: 301 Views: 739526 |
Forum: The A.E. Seaman Mineral Museum Posted: Apr 06, 2016 09:23 Subject: Re: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
| Sulfides from Merelani tanzanite district, Tanzania.
The Mineralogical Record published a paper on “Spectacular sulfides from the Merelani tanzanite deposit, Lelatema Mountains [S. Harrison, et. al ... |
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| Topic: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
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| John Jaszczak Replies: 301 Views: 739526 |
Forum: The A.E. Seaman Mineral Museum Posted: Apr 03, 2016 20:40 Subject: Re: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
| Congratulations to Bruce Cairncross on his fine Connoisseur's Choice article on Shigaite in the March/April 2016 issue of Rocks and Minerals. A few specimens of Shigaite and associated minerals from ... | |
| Topic: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
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| John Jaszczak Replies: 301 Views: 739526 |
Forum: The A.E. Seaman Mineral Museum Posted: Mar 31, 2016 11:29 Subject: Re: A. E. Seaman Mineral Museum, Michigan Technological Univ., Houghton, Michigan |
| A famous specimen of silver crystals on copper formerly in the John T. Reeder collection. | |
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