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16 Jan-08:33:31 Re: apophyllite from brazil - a new find from 2021? (Gagat Minerals)
15 Jan-22:46:01 Re: tucson shows 2022 - it's starting!! (Alfredo)
15 Jan-22:29:08 Re: tucson shows 2022 - it's starting!! (Bob Harman)
15 Jan-22:23:43 Re: apophyllite from brazil - a new find from 2021? (Alfredo)
15 Jan-22:19:22 The mizunaka collection - thin quartz (Am Mizunaka)
15 Jan-19:31:17 Apophyllite from brazil - a new find from 2021? (Gagat Minerals)
15 Jan-18:40:57 Re: alleged 'silvers' from udokan? (Bob Harman)
15 Jan-17:48:47 Tucson shows 2022 (Bob Kerr)
15 Jan-17:32:21 Re: alleged 'silvers' from udokan? (Alfredo)
15 Jan-16:52:31 Re: alleged 'silvers' from udokan? (Bob Harman)
15 Jan-16:23:26 Re: collection of michael shaw (Michael Shaw)
15 Jan-16:21:55 Chalcostibite - silvia's collection (Silvia)
15 Jan-14:22:05 Re: collection of sante celiberti (Sante Celiberti)
15 Jan-13:19:53 Re: alleged 'silvers' from udokan? (Jordi Fabre)
15 Jan-13:11:33 Re: alleged 'silvers' from udokan? (Jordi Fabre)
15 Jan-12:59:38 Re: collection of volkmar stingl (Volkmar Stingl)
14 Jan-17:42:03 Re: collection of firmo espinar (Firmo Espinar)
14 Jan-07:48:15 Re: collection of enrique llorens (Enrique Llorens)
14 Jan-07:36:53 Re: collection of enrique llorens (Jose Luis Jara Jara)
14 Jan-07:13:50 Re: collection of enrique llorens (Enrique Llorens)
14 Jan-01:49:47 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)
13 Jan-18:53:08 Re: collection of enrique llorens (Silvia)
13 Jan-15:31:28 Re: the mizunaka collection - quartz (Am Mizunaka)
13 Jan-12:47:07 Re: collection of enrique llorens (Enrique Llorens)
13 Jan-04:55:05 Re: the mizunaka collection - quartz (James Catmur)

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  Topic: Seeking methodology for identifying crystalline forms.
Pete Richards

Replies: 11
Views: 618

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 04, 2022 14:32   Subject: Re: Seeking methodology for identifying crystalline forms.
Bob, Josele,

Bob, you are right that some crystal classes in the isometric system have 2-fold axes rather than 4-fold - notably pyrite - and some have four-fold axes with inversion. Josele is righ ...
  Topic: Seeking methodology for identifying crystalline forms.
Pete Richards

Replies: 11
Views: 618

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 03, 2022 19:51   Subject: Re: Seeking methodology for identifying crystalline forms.
While I don't disagree with Bob about the value of a textbook, I suggest you look up a set of pages on Mindat.org. Search for Donald B. Peck Mindat or www.mindat.org/user-41199.html#5. There are a se ...
  Topic: Measuring the specific gravity?
Pete Richards

Replies: 13
Views: 538

PostForum: Off-Topic and Introductions   Posted: Dec 30, 2021 16:54   Subject: Re: Measuring the specific gravity?
Remove the exclamation point!

And welcome!
  Topic: San Pedro Corralitos unknown
Pete Richards

Replies: 8
Views: 596

PostForum: What is it? - Where is it from?   Posted: Dec 23, 2021 16:20   Subject: Re: San Pedro Corralitos unknown
Asked in ignorance: what about plattnerite?
  Topic: Merry Christmas and Happy New Year 2022!
Pete Richards

Replies: 18
Views: 1149

PostForum: Comments & Suggestions   Posted: Dec 23, 2021 14:24   Subject: Re: Merry Christmas and Happy New Year 2022!
Fantastic cristobalite!!!
  Topic: Merry Christmas and Happy New Year 2022!
Pete Richards

Replies: 18
Views: 1149

PostForum: Comments & Suggestions   Posted: Dec 23, 2021 12:49   Subject: Re: Merry Christmas and Happy New Year 2022!
From me also!
  Topic: Minerals and mysteries from a college collection
Pete Richards

Replies: 8
Views: 1659

PostForum: What is it? - Where is it from?   Posted: Oct 21, 2021 09:09   Subject: Re: Minerals and mysteries from a college collection
Thanks to all who offered suggestions about my first two mysteries!

Thanks, Don, for suggesting kröhnkite; I had also thought of that, and it fits.

Peter, your phosphorite nodule is extremel ...
  Topic: Minerals and mysteries from a college collection
Pete Richards

Replies: 8
Views: 1659

PostForum: What is it? - Where is it from?   Posted: Oct 19, 2021 19:53   Subject: Re: Minerals and mysteries from a college collection
Here's one that looks kind of like a petrified golf ball - and is about that size. I'm not even sure whether it is a mineral, a rock, or a fossil, though I lean toward the latter. Does anybody recog ...
  Topic: Minerals and mysteries from a college collection
Pete Richards

Replies: 8
Views: 1659

PostForum: What is it? - Where is it from?   Posted: Oct 19, 2021 19:49   Subject: Minerals and mysteries from a college collection
I'm back to working on the local college's mineral collection - which needs a lot of help. This interesting specimen is labeled bloedite, and claims to be from Chuquicamata, Chile. Part of it certai ...
  Topic: Question about an old specimen
Pete Richards

Replies: 8
Views: 1664

PostForum: What is it? - Where is it from?   Posted: Sep 27, 2021 09:08   Subject: Re: Question about an old specimen
M vote is for this being from Binn Valley (Binntal), but not Lengenbach Quarry. The matrix is poorly shown but looks reasonable for Binn. The blocky dark grey crystals have a reasonable hematite mor ...
  Topic: Will Barite save the world?
Pete Richards

Replies: 15
Views: 2540

PostForum: Off-Topic and Introductions   Posted: Sep 24, 2021 08:56   Subject: Re: Will Barite save the world?
Thanks to Amir for his good and well illustrated explanation!

I think the problem in the original statement is that the paint would COOL the pavement (or whatever). I suggest this is not accurate. ...
  Topic: Sold as “Green stilbite”
Pete Richards

Replies: 11
Views: 2353

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 16, 2021 15:44   Subject: Re: Sold as “Green stilbite”
It bears emphasis that garnet is the name of a mineral, while greenschist is the name of a metamorphic rock. I don't claim to be a petrologist, but I believe "greenschist" implies a certain ...
  Topic: Mookaite?
Pete Richards

Replies: 2
Views: 816

PostForum: What is it? - Where is it from?   Posted: Aug 28, 2021 15:02   Subject: Re: Mookaite?
Mookaite is not an official mineral name. It is better described as the name of a rock composed mostly of silica from the skeletons of radiolaria, and is properly applied to rock from a particular lo ...
  Topic: About cyclic twinning - (5)
Pete Richards

Replies: 144
Views: 211888

PostForum: Featured Columns of FMF   Posted: Aug 06, 2021 10:19   Subject: Re: About cyclic twinning - (5)
Several isometric minerals form fivelings, including diamond, copper, gold, and I think silver.
  Topic: Black, metallic, yellow oxide?
Pete Richards

Replies: 24
Views: 4138

PostForum: What is it? - Where is it from?   Posted: Jul 21, 2021 20:28   Subject: Re: Black, metallic, yellow oxide?
the first one suggests brookite (orthorhombic) altering to earthy anatase. The second one does not....

I don't know how this fits with the apparent cleavages.
  Topic: Linarite or azurite
Pete Richards

Replies: 5
Views: 3244

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Jul 12, 2021 14:52   Subject: Re: Linarite or azurite
I have a note in my catalog describing subjecting linarite to dilute HCl. It did not fizz but dissolved slowly, producing a white coating on the linarite. This was a specimen from the Dunbrack Mine ...
  Topic: Help with historical stone mystery - slag, or something else?
Pete Richards

Replies: 11
Views: 1955

PostForum: What is it? - Where is it from?   Posted: Jun 25, 2021 12:51   Subject: Re: Help with historical stone mystery - slag, or something else?
note the exact date they were found and see if anywhere upwind
A good idea. But I think (any true petrologists, please confirm) that really light (floatable) pumice is probably rhyolitic in nature, ...
  Topic: Help with historical stone mystery - slag, or something else?
Pete Richards

Replies: 11
Views: 1955

PostForum: What is it? - Where is it from?   Posted: Jun 25, 2021 10:38   Subject: Re: Help with historical stone mystery - slag, or something else?
This is an interesting question. I suppose the overlap in chemical composition could be considerable between the two sources, depending on the nature of the iron ore. I think the analyses use archai ...
  Topic: Unknown mineral from Pikes Peak pegmatite
Pete Richards

Replies: 23
Views: 4394

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2021 21:06   Subject: Re: Unknown mineral from Pikes Peak pegmatite
Phenakite?
Good thought. Right environment, right general color or lack thereof.

However, phenakite is trigonal and typically occurs as prismatic crystals with a hexagonal outline. The crystal s ...
  Topic: Unknown mineral from Pikes Peak pegmatite
Pete Richards

Replies: 23
Views: 4394

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2021 20:55   Subject: Re: Unknown mineral from Pikes Peak pegmatite
Re: "Harder than steel"
That is true of euclase and danburite... and topaz and a number of other minerals.
 
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