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Newest topics and users posts
14 May-23:17:51 The mizunaka collection - villiaumite (Am Mizunaka)
14 May-19:36:49 Re: is this still quartz?? (Steveb)
14 May-13:16:33 Re: is this still quartz?? (Amir Akhavan)
14 May-05:39:32 Re: is this still quartz?? (Alfredo)
14 May-04:42:01 Re: collection of firmo espinar (Firmo Espinar)
14 May-04:01:54 Re: is this still quartz?? (James Catmur)
14 May-04:00:56 Re: collection of shawn spink (Shawn S)
14 May-03:56:12 Re: collection of shawn spink (James Catmur)
14 May-01:10:03 Re: collection of shawn spink (Jordi Fabre)
14 May-00:59:12 Re: collection of shawn spink (Fmf Forum)
13 May-22:19:30 Is this still quartz?? (Ken)
13 May-18:15:30 Re: collection of shawn spink (Bob Carnein)
13 May-18:12:35 Re: collection of shawn spink (Shawn S)
13 May-18:00:35 Re: collection of shawn spink (Shawn S)
13 May-17:51:04 Re: collection of shawn spink (Shawn S)
13 May-17:24:34 Re: collection of shawn spink (Shawn S)
13 May-17:20:26 Re: collection of shawn spink (Shawn S)
13 May-17:08:43 Re: collection of shawn spink (Alfredo)
13 May-17:00:58 Re: collection of shawn spink (Shawn S)
13 May-16:49:28 Re: collection of shawn spink (Bob Harman)
13 May-16:37:43 Re: collection of shawn spink (Shawn S)
13 May-15:49:35 Re: collection of shawn spink (Bob Harman)
13 May-13:44:53 Collection of shawn spink (Shawn S)
13 May-13:14:37 Re: morocco, light, shape and colour - (36) (Fmf Forum)
13 May-13:12:55 Morocco, light, shape and colour - (36) (Fmf Forum)

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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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  Topic: Opal soil finds
Peter Megaw

Replies: 3
Views: 473

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 19, 2021 09:43   Subject: Re: Opal soil finds
Given that these are coming from an opal deposit , the hardness and KISS says something siliceous is a likely possibility. The fibrous texture looks like satin spar (gypsum) or certain pedogenic carbo ...
  Topic: Green, purple, white and orthoclase conglomerate?
Peter Megaw

Replies: 3
Views: 377

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 19, 2021 09:22   Subject: Re: Green, purple, white and orthoclase conglomerate?
Charly, looks more like a piece of pegmatite with a granite xenolith and late epidote veining to me. Not quite sure I see purple exactly...looks like it might be fine-grained dispersed specularite. T ...
  Topic: Fluorite Santa Eulalia
Peter Megaw

Replies: 3
Views: 579

PostForum: What is it? - Where is it from?   Posted: Apr 10, 2021 17:57   Subject: Re: Fluorite Santa Eulalia
Linus...Mina El Carmen is the westernmost mine in the West Camp!
  Topic: anyone know this "Thulite-Hornblende" locality?
Peter Megaw

Replies: 5
Views: 622

PostForum: What is it? - Where is it from?   Posted: Apr 05, 2021 09:41   Subject: Re: anyone know this "Thulite-Hornblende" locality?
Thanks Folks!

Good to reconnect it with a locality, the pink is really very pretty

Another 50 cent "score" at the sale was this fake fossil from Morocco!!
  Topic: anyone know this "Thulite-Hornblende" locality?
Peter Megaw

Replies: 5
Views: 622

PostForum: What is it? - Where is it from?   Posted: Apr 04, 2021 16:39   Subject: anyone know this "Thulite-Hornblende" locality?
Picked up this polished slab labeled "Thulite Hornblende" at a estate sale because the pink is quite pretty (much better than my phone camera rendition) and the reaction rims around it. It ...
  Topic: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
Peter Megaw

Replies: 9
Views: 1583

PostForum: Minerals and Mineralogy   Posted: Mar 10, 2021 19:01   Subject: Re: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
Given that Creedite is highly light sensitive and will lose color relatively rapidly in sunlight, I doubt that Mn is the chromophore and suspect that a more elusive color source is operating here.
  Topic: Locality for Mexican Quartz specimens
Peter Megaw

Replies: 4
Views: 1036

PostForum: What is it? - Where is it from?   Posted: Mar 04, 2021 13:00   Subject: Re: Locality for Mexican Quartz specimens
There are some quartzes with that kind of "waist" from the San Antonio Mine at Santa Eulalia, but they are from the primary zone and are not associated with oxides of iron or copper. Also si ...
  Topic: Locality for Mexican Quartz specimens
Peter Megaw

Replies: 4
Views: 1036

PostForum: What is it? - Where is it from?   Posted: Mar 03, 2021 20:51   Subject: Re: Locality for Mexican Quartz specimens
Brent, the first one is almost certainly Concepcion del Oro, Zacatecas...the second one probably (95%) is,...the shape of the crystals is pretty distinctive
  Topic: Heat changes some minerals - how?
Peter Megaw

Replies: 11
Views: 1863

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2021 11:28   Subject: Re: Heat changes some minerals - how?
Tom...depends a lot on the mineral...in some cases changes in structure may be reversible when it cools off...although in some minerals the changes might be metastable and the reversion might take a l ...
  Topic: When the Financial Times talks about minerals
Peter Megaw

Replies: 3
Views: 6800

PostForum: Comments & Suggestions   Posted: Jan 11, 2021 12:46   Subject: Re: When the Financial Times talks about minerals
TGMS did not!
  Topic: This crazy mineral market!
Peter Megaw

Replies: 14
Views: 3479

PostForum: Comments & Suggestions   Posted: Jan 05, 2021 16:39   Subject: Re: This crazy mineral market!
Good point Alfredo, but whether it's legally binding or not, trying to take advantage of a child like that is as lame as a Debbie Boone Tribute Band
  Topic: This crazy mineral market!
Peter Megaw

Replies: 14
Views: 3479

PostForum: Comments & Suggestions   Posted: Jan 04, 2021 14:04   Subject: Re: This crazy mineral market!
When I sold at shows I always had pieces mixed in here and there with price tags labeled "Free to Under 12" . Kept the kids busy looking for them...and their parents usually bought something ...
  Topic: New text on the FMF
Peter Megaw

Replies: 6
Views: 1896

PostForum: Mines and Mineral Localities   Posted: Jan 04, 2021 08:36   Subject: Re: New text on the FMF
How sad...but this kind of "protection" costs nothing except a few more slices of common sense.

In the US it does nothing to slow down anybody, but perhaps the trespasser's lawyers after ...
  Topic: Help identifying unique rock
Peter Megaw

Replies: 10
Views: 2112

PostForum: What is it? - Where is it from?   Posted: Jan 03, 2021 19:39   Subject: Re: Help identifying unique rock
Just Google "Cape Cod geology USGS" it'll take you right to the paper
  Topic: Help identifying unique rock
Peter Megaw

Replies: 10
Views: 2112

PostForum: What is it? - Where is it from?   Posted: Jan 03, 2021 19:35   Subject: Re: Help identifying unique rock
There's a really good beginners book on the geology of Cape Cod...I know where my copy is...at my sister's in Falmouth

I'll see if I can get you a title
  Topic: Help identifying unique rock
Peter Megaw

Replies: 10
Views: 2112

PostForum: What is it? - Where is it from?   Posted: Jan 03, 2021 19:34   Subject: Re: Help identifying unique rock
Welcome to the Monkey House...
  Topic: Help identifying unique rock
Peter Megaw

Replies: 10
Views: 2112

PostForum: What is it? - Where is it from?   Posted: Jan 03, 2021 17:08   Subject: Re: Help identifying unique rock
Forgot to mention that those parallel grooves on the smooth surface were probably made by the glacier as it was dragged against other rocks

In short...what has happened to this rock is more intere ...
  Topic: Help identifying unique rock
Peter Megaw

Replies: 10
Views: 2112

PostForum: What is it? - Where is it from?   Posted: Jan 03, 2021 17:06   Subject: Re: Help identifying unique rock
Tough call....not much information to work from other than it looks fairly homogeneous with minor fractures.The beaches of Massachusetts are mostly glacial dumps composed of rocks ripped up and transp ...
  Topic: This crazy mineral market!
Peter Megaw

Replies: 14
Views: 3479

PostForum: Comments & Suggestions   Posted: Jan 02, 2021 20:13   Subject: Re: This crazy mineral market!
Ah...but Alfredo there is an out here!!

In competition a TN must be 25mm as displayed...not maximum dimension but if it'll fit in a 25mm cube. So if you displayed this tilted a bit it would pass mu ...
  Topic: Pyrite with bubble-like growths
Peter Megaw

Replies: 21
Views: 4749

PostForum: Minerals and Mineralogy   Posted: Dec 31, 2020 19:39   Subject: Re: Pyrite with bubble-like growths
Pete...here are two pyrrhotites from Santa Eulalia which show something similar. I think I have a galena from Naica that has one too

Happy New Year!!
 
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