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09 Dec-17:22:13 Re: franjungle collection (Franjungle)
09 Dec-15:38:46 Re: minerals of dr congo, katanga. (Roger Warin)
09 Dec-14:17:50 Re: munich show (mineralientage) 2017 (Roger Warin)
09 Dec-11:34:41 Re: collection of philippe durand (Philippe Durand)
09 Dec-10:45:58 Re: collection of heimo hellwig (Heimo Hellwig)
09 Dec-10:34:36 Re: collection of fiebre verde - chivor (#676) (Fiebre Verde)
09 Dec-10:07:25 Re: collection of fiebre verde - chivor (#676) (Fiebre Verde)
09 Dec-09:50:32 Re: collection of fiebre verde - chivor (#676) (Crosstimber)
09 Dec-09:47:10 Re: collection of michael shaw (Crosstimber)
09 Dec-04:08:58 Re: the mizunaka collection - fluorite (Tobi)
09 Dec-03:28:32 The mizunaka collection - mimetite (Am Mizunaka)
08 Dec-21:13:27 Re: collection of fiebre verde - chivor (#676) (Don Lum)
08 Dec-20:51:42 Re: collection of fiebre verde - chivor (#676) (Fiebre Verde)
08 Dec-15:22:53 Re: minerals for fossils (Fossil Collector)
08 Dec-15:20:25 Re: minerals for fossils (Fossil Collector)
08 Dec-15:16:11 Re: minerals for fossils (Fossil Collector)
08 Dec-14:56:01 Re: minerals for fossils (Peter Lemkin)
08 Dec-13:37:32 Re: minerals for fossils (Fossil Collector)
08 Dec-11:01:45 Re: minerals of dr congo, katanga. (Roger Warin)
08 Dec-10:57:30 Re: does turquoise ever come in other colors? (Lluis)
08 Dec-10:45:51 Re: minerals of dr congo, katanga. (Roger Warin)
08 Dec-10:38:41 Re: minerals for fossils (Fossil Collector)
08 Dec-10:28:06 Re: minerals for fossils (James)
08 Dec-09:14:02 Re: minerals for fossils (Fossil Collector)
08 Dec-04:36:34 Re: minerals for fossils (Peter Lemkin)

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  Topic: Minerals sans life
Pete Modreski

Replies: 7
Views: 454

PostForum: Minerals and Mineralogy   Posted: Dec 06, 2017 13:22   Subject: Re: Minerals sans life
Tom, this interesting question has actually been the subject of a whole series of papers, by Robert M. Hazen of the Geophysical Laboratory of the Carnegie Institution of Washington and then with follo ...
  Topic: What is it #2
Pete Modreski

Replies: 6
Views: 502

PostForum: What is it? - Where is it from?   Posted: Nov 24, 2017 12:47   Subject: Re: What is it #2
Andrew, I think that what looks like crystal faces on your piece of coal, is just the way the coal breaks. It tends to fracture along flat, perpendicular planes; it's a type of cleavage, and in coal m ...
  Topic: What is it #3
Pete Modreski

Replies: 3
Views: 370

PostForum: What is it? - Where is it from?   Posted: Nov 22, 2017 17:28   Subject: Re: What is it #3
I agree with Pete; I think this one is a piece of slag--iron-rich glassy material left from some kind of a smelter. It appears to have air bubbles in it, and the swirly texture on the top surface are ...
  Topic: What is it #2
Pete Modreski

Replies: 6
Views: 502

PostForum: What is it? - Where is it from?   Posted: Nov 22, 2017 16:28   Subject: Re: What is it #2
I am thinking you have a piece of coal. Does it feel THAT light?
  Topic: What is this
Pete Modreski

Replies: 3
Views: 300

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 22, 2017 13:20   Subject: Re: What is this
No, no limits here, though we always appreciate it if someone does not post 10 or 20 unknowns one after the other!
  Topic: What is this
Pete Modreski

Replies: 3
Views: 300

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 22, 2017 12:34   Subject: Re: What is this
I got a smile out of seeing your reference to the "killas" host rocks, which is a term I haven't much seen or thought about, since I once visited mines in Cornwall, several decades ago! A c ...
  Topic: Is this zircon ?
Pete Modreski

Replies: 9
Views: 731

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 20, 2017 15:47   Subject: Re: Is this zircon ?
I agree, that this looks more like garnet than anything else.

Here is a suggestion, if you know someone who has access to both a short and a long wave ultraviolet light. Examine it for fluorescenc ...
  Topic: Mineral names in different languages and their meaning
Pete Modreski

Replies: 16
Views: 1030

PostForum: Minerals and Mineralogy   Posted: Nov 18, 2017 15:45   Subject: Re: Mineral names in different languages and their meaning
Tobi, I am sure you may get many replies to this. There are MANY such names in English--some old, some more recently coined, many originating in the U.K., but some in America too. I know of a few su ...
  Topic: Help identifying my stone. UK coastline.
Pete Modreski

Replies: 2
Views: 452

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 03, 2017 11:59   Subject: Re: Help identifying my stone. UK coastline.
Dear Iceantia,
I'm sure you will understand, as per Jordi's reply, that first there are just not any very distinctive features about this pebble that would help us to even make a good guess as to it ...
  Topic: I got a idea but not sure
Pete Modreski

Replies: 4
Views: 516

PostForum: What is it? - Where is it from?   Posted: Nov 01, 2017 11:41   Subject: Re: i got a idea but not sure
Depending on the accuracy of your specific gravity measurement, the sp. gr. suggests beryl (though the crystal shape does not suggest beryl), or quartz (if your measurement has enough error to encompa ...
  Topic: Help with identification of rock/mineral
Pete Modreski

Replies: 6
Views: 681

PostForum: Minerals and Mineralogy   Posted: Oct 23, 2017 13:33   Subject: Re: Help with identification of rock/mineral
Dear Duane/Mineralien,

Although feldspar is distinguished by having good cleavage that causes it to break along flat surfaces, quartz can also sometimes break in a "blocky" pattern, like ...
  Topic: Art Soregaroli's passing
Pete Modreski

Replies: 8
Views: 1132

PostForum: In Memoriam   Posted: Oct 19, 2017 22:22   Subject: Re: Art Soregaroli's passing
Thank you, Peter, for the very good writeup about Art. I'm sorry to hear about his passing. I knew Art too, not nearly so well as some of you, and had really enjoyed knowing and talking to him.
  Topic: Need help in identifying a mineral sample
Pete Modreski

Replies: 7
Views: 808

PostForum: What is it? - Where is it from?   Posted: Oct 05, 2017 11:42   Subject: Re: Need help in identifying a mineral sample
Your specimen still is very likely, calcite. In ordinary vinegar, the bubbling is very slow--hard to notice.

Another test; see if you can scratch it easily, by scratching gently, with the point of ...
  Topic: Stone ID
Pete Modreski

Replies: 2
Views: 498

PostForum: What is it? - Where is it from?   Posted: Oct 05, 2017 11:16   Subject: Re: Stone ID
Dear Makanudo,

As Kushmeja wrote, without more information, it is almost impossible for anyone to say with any certainty what minerals are in this rock. Your posting id. says that you are from Bel ...
  Topic: Cobalt and green rock help identifying
Pete Modreski

Replies: 5
Views: 857

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Oct 03, 2017 12:51   Subject: Re: Cobalt and green rock help identifying
And with such nice shades of color, it's likely to be some kind of leftover glass from a glassworks making decorative/ornamental glass, as opposed to true "slag" that are the leftovers from ...
  Topic: Mineral oddities.....well sort of!
Pete Modreski

Replies: 2
Views: 781

PostForum: Minerals and Mineralogy   Posted: Sep 30, 2017 20:53   Subject: Re: Mineral oddities.....well sort of!
Well, interesting. But I guess these magazine issues are never going to become the kind of collectors item as are postage stamps with the airplane printed upside down!
  Topic: Is Kambaba Jasper a Stromatolite?
Pete Modreski

Replies: 22
Views: 2170

PostForum: Minerals and Mineralogy   Posted: Sep 28, 2017 14:25   Subject: Re: Is Kambaba Jasper a Stromatolite?
I did a little more (successful) browsing about "kambaba" and I did find this and thought I'd share it, about its source. This is from Norcross, a company that mines and sells a great deal ...
  Topic: Rock ID Central Indiana
Pete Modreski

Replies: 4
Views: 758

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 27, 2017 16:48   Subject: Re: Rock ID Central Indiana
Yes indeed, slag glass (or "glassy slag", if you prefer), leftovers from some kind of industrial smelting operation.
  Topic: Is Kambaba Jasper a Stromatolite?
Pete Modreski

Replies: 22
Views: 2170

PostForum: Minerals and Mineralogy   Posted: Sep 27, 2017 13:25   Subject: Re: Is Kambaba Jasper a Stromatolite?
I'd like to add my "two cents" about this discussion. There are many points of possible confusion about the rocks being discussed here! It does seem quite clear that the two kinds of green ...
  Topic: How common is pyrite disease?
Pete Modreski

Replies: 6
Views: 978

PostForum: Minerals and Mineralogy   Posted: Sep 20, 2017 13:14   Subject: Re: How common is pyrite disease?
Richard, just to add, I think you'll find that pyrite nodules that form in sedimentary rocks, tend to be the most susceptible to rapid deterioration. Most of the "very clean looking" pyrite ...
 
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