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18 Sep-05:25:58 Re: malachite stalactites, katanga province (Jordi Fabre)
18 Sep-05:18:45 Re: malachite stalactites, katanga province (Peter Lemkin)
18 Sep-04:56:09 Malachite stalactites, katanga province (Roger Warin)
17 Sep-09:46:55 Re: tracing the dealer "minerals engineering" or brian petrovic (Tomcotterell)
17 Sep-09:30:37 Re: tracing the dealer "minerals engineering" or brian petrovic (Peter Megaw)
17 Sep-07:57:26 Minfind dot com is back! (Bob Kerr)
17 Sep-07:46:04 Re: sold as “green stilbite” (Alfredo)
17 Sep-07:18:23 Tracing the dealer "minerals engineering" or brian petrovic (Tomcotterell)
17 Sep-06:28:12 Re: sold as “green stilbite” (Charly H)
16 Sep-15:44:40 Re: sold as “green stilbite” (Pete Richards)
16 Sep-10:54:45 Re: sold as “green stilbite” (Charly H)
16 Sep-10:36:43 Re: sold as “green stilbite” (Bergur_e_sigurdarson)
16 Sep-10:12:03 Re: sold as “green stilbite” (Charly H)
16 Sep-05:57:03 Re: sold as “green stilbite” (Charly H)
16 Sep-05:55:13 Re: sold as “green stilbite” (Charly H)
16 Sep-01:26:21 Re: fulgurite (Peter Lemkin)
16 Sep-00:42:43 Re: sold as “green stilbite” (Jordi Fabre)
15 Sep-22:29:50 Re: sold as “green stilbite” (Matt_zukowski)
15 Sep-20:31:13 Re: sold as “green stilbite” (Bergur_e_sigurdarson)
15 Sep-20:14:50 Sold as “green stilbite” (Charly H)
15 Sep-17:02:00 Re: online catalog of the minerals of the igme collections - madrid community (Firmo Espinar)
15 Sep-16:16:11 Re: collection of sante celiberti (Sante Celiberti)
15 Sep-16:03:04 Re: fulgurite (B Glassburn)
15 Sep-09:59:38 Re: fulgurite (Matt_zukowski)
15 Sep-09:56:05 Re: fulgurite (Josele)

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  Topic: Sold as “Green stilbite”
alfredo

Replies: 11
Views: 604

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 17, 2021 07:46   Subject: Re: Sold as “Green stilbite”
Certainly looks like heulandite crystals colored by inclusions of celadonite, and almost certainly from a basalt rock rather than a metamorphic rock, but whether it's from Iceland or India or elsewher ...
  Topic: Online catalog of the minerals of the IGME collections - Madrid Community
alfredo

Replies: 4
Views: 17802

PostForum: IGME (Instituto Geológico y Minero de España)   Posted: Sep 14, 2021 13:05   Subject: Re: Online catalog of the minerals of the IGME collections - Madrid Community
We went last week to Madrid and visited the Geominero Museum, right next door to the IGME (Instituto Geologico y Minero de España). Curator Ramon Jimenez very kindly met us and gave us an introduction ...
  Topic: Announcing the opening of the New Gem and Mineral Museum of the University of Arizona
alfredo

Replies: 5
Views: 545

PostForum: University Arizona Tucson Mineral Museum   Posted: Sep 07, 2021 14:44   Subject: Re: Announcing the opening of the New Gem and Mineral Museum of the University of Arizona
One small warning: The museum is open, but so far only at rather strange hours for a museum, Monday to Friday, 10:00 to 2:00. No evenings or weekends. So don't drive to Tucson for the weekend to see i ...
  Topic: Mineral questions from a woodworker!
alfredo

Replies: 3
Views: 457

PostForum: Off-Topic and Introductions   Posted: Sep 04, 2021 23:28   Subject: Re: Mineral questions from a woodworker!
Welcome to the Forum, Ron. What are you using for crushing the minerals, and what size particles do you want to end up with? That will have some influence on which minerals might be suitable.
  Topic: Crystal Habit of this Pyrite Mineral
alfredo

Replies: 7
Views: 643

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 05, 2021 12:41   Subject: Re: Crystal Habit of this Pyrite Mineral
In that case no pyrrhotite, and probably indeed pyrite as you thought, and perhaps also including other sulphides as Pete said.
  Topic: Crystal Habit of this Pyrite Mineral
alfredo

Replies: 7
Views: 643

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 05, 2021 12:25   Subject: Re: Crystal Habit of this Pyrite Mineral
Also, check it with a magnet to see whether it's really pyrite, or might be pyrrhotite.
  Topic: About a rutile epitaxy on hematite in quartz
alfredo

Replies: 3
Views: 715

PostForum: Micros & Macros - Images of Minerals   Posted: Jul 29, 2021 21:35   Subject: Re: About a rutile epitaxy on hematite in quartz
Roger, I often saw such fractures in heavily included quartz crystals, and I wondered whether they could perhaps be caused by strain due to differential thermal expansion between the quartz and the ru ...
  Topic: Linarite or azurite
alfredo

Replies: 5
Views: 1098

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Jul 10, 2021 00:50   Subject: Re: Linarite or azurite
20% acetic acid makes azurite give off bubbles of carbon dioxide, although slowly, not fast like the effervescence under strong HCl. Linarite won't bubble in acetic acid of any strength.
  Topic: What is it?
alfredo

Replies: 4
Views: 808

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 02, 2021 23:28   Subject: Re: What is it?
On the positive side, the outer rind on yours looks natural. Most of the ones that come to market from Brazil are painted green on the outside and have cement in cracks, etc. So I'll give yours some e ...
  Topic: Help with historical stone mystery - slag, or something else?
alfredo

Replies: 11
Views: 1223

PostForum: What is it? - Where is it from?   Posted: Jun 26, 2021 02:23   Subject: Re: Help with historical stone mystery - slag, or something else?
Given the direction of the Gulf Stream, I think pumice is more likely to reach Scotland from the Azores than from Iceland, and the Azores certainly have more silicic pumice-producing eruptions than Ic ...
  Topic: Help with historical stone mystery - slag, or something else?
alfredo

Replies: 11
Views: 1223

PostForum: What is it? - Where is it from?   Posted: Jun 25, 2021 14:01   Subject: Re: Help with historical stone mystery - slag, or something else?
Keep in mind that great pumice "rafts", sometimes several square km in extent, have been washed up on shores in Japan, Fiji and elsewhere that came from undersea eruptions and did not corres ...
  Topic: What kind of mineral is it ?
alfredo

Replies: 4
Views: 680

PostForum: What is it? - Where is it from?   Posted: Jun 23, 2021 10:10   Subject: Re: What kind of mineral is it ?
Reddit is obviously not the right venue to ask for mineral identifications. ;))

This stone is obviously some type of chert or jasper. No reason to think there is any arsenic in it,
  Topic: Unknown mineral from Pikes Peak pegmatite
alfredo

Replies: 23
Views: 2802

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2021 20:49   Subject: Re: Unknown mineral from Pikes Peak pegmatite
"there is a single fairly planar crack that appears to be perpendicular to the long axis that shows up when the light hits it just right." ...sounds like an incipient basal cleavage? That, a ...
  Topic: Unknown mineral from Pikes Peak pegmatite
alfredo

Replies: 23
Views: 2802

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2021 18:06   Subject: Re: Unknown mineral from Pikes Peak pegmatite
Have you tried fluorescence under UV? Danburite is often (unfortunately not always) fluorescent blue under shortwave UV. I know nothing about the fluorescence of euclase, but fluorescent response migh ...
  Topic: Mineral spirituality?
alfredo

Replies: 29
Views: 15092

PostForum: Minerals and Mineralogy   Posted: Jun 13, 2021 17:59   Subject: Re: Mineral spirituality?
The "hottest" natural mineral ever found is orders of magnitude weaker than the artificial isotopes used in brachytherapy, so no, no hope of that working with a natural mineral at all.
  Topic: Mineral spirituality?
alfredo

Replies: 29
Views: 15092

PostForum: Minerals and Mineralogy   Posted: Jun 12, 2021 13:32   Subject: Re: Mineral spirituality?
i think the "hormesis" theory is probably correct and LOW doses of ionizing radiation could be actually beneficial for human health.

https://en.wikipedia.org/wiki/Radiation_hormesis


...
  Topic: Is this still quartz??
alfredo

Replies: 7
Views: 1546

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 14, 2021 05:39   Subject: Re: Is this still quartz??
To me they all look like jasper or chert, both of which are types of micro-granular or microcrystalline quartz that are impure (due to abundant inclusions of iron oxides, chlorite, clays, etc) and con ...
  Topic: Collection of Shawn Spink
alfredo

Replies: 15
Views: 1738

PostForum: Collection photos and Collector's page   Posted: May 13, 2021 17:08   Subject: Re: Collection of Shawn Spink
Note that it's the Chinle Formation, not Chinese Formation. Probably an error caused by automated spelling correction software... I hate those programs! ;))
Nice rich piece anyway.

https://en.wik ...
  Topic: Magnetic serpentine?
alfredo

Replies: 2
Views: 794

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 08, 2021 02:15   Subject: Re: Magnetic serpentine?
Riverside county has lots of metamorphic rocks with magnetite in them. I've seen many in the San Gorgonio Pass - Palm Springs area. The soft part might be mica or chlorite rather than serpentine. Usua ...
  Topic: Collection of David Carter
alfredo

Replies: 18
Views: 3011

PostForum: Collection photos and Collector's page   Posted: May 03, 2021 09:00   Subject: Re: Collection of David Carter
Nice villiaumites, David. The Russian ones seem to be a deeper color than the lighter red or raspberry-colored ones from Namibia, of which I recently got some from an American friend who collected the ...
 
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