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Newest topics and users posts
10 Aug-13:36:06 Re: new administrator - peter farquhar (Don Lum)
10 Aug-13:29:28 Re: collection of michael shaw (Michael Shaw)
10 Aug-13:06:56 Re: new administrator - peter farquhar (Michael Shaw)
10 Aug-12:58:24 New administrator - peter farquhar (Peter Farquhar)
10 Aug-12:08:59 Re: calcite ? (Dany Mabillard)
10 Aug-12:03:25 Re: collection from dany mabillard (Dany Mabillard)
10 Aug-11:15:56 Re: don lum collection (Don Lum)
10 Aug-08:11:33 Re: popular minerals - twinned quartz (japan law twin) from colombia (Tobi)
10 Aug-08:06:36 Re: collection from dany mabillard (Tobi)
10 Aug-08:02:04 Re: don lum collection (Tobi)
10 Aug-01:45:42 Re: about cyclic twinning - (5) (James Catmur)
10 Aug-00:30:55 Re: calcite ? (Steveb)
09 Aug-23:07:54 Re: about cyclic twinning - (5) (Don Lum)
09 Aug-22:29:05 Re: about cyclic twinning - (5) (Kevin Conroy)
09 Aug-15:30:13 Re: about cyclic twinning - (5) (Don Lum)
09 Aug-14:38:08 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
09 Aug-14:28:35 Re: about cyclic twinning - (5) (Kevin Conroy)
09 Aug-12:02:30 Re: about cyclic twinning - (5) (Bob Morgan)
09 Aug-11:36:21 Re: calcite ? (Michael Shaw)
09 Aug-11:27:41 Re: calcite ? (Vic Rzonca)
09 Aug-11:10:11 Re: help needed for chinese locations (Dany Mabillard)
09 Aug-09:47:12 Re: help needed for chinese locations (Volkmar Stingl)
09 Aug-09:33:00 Calcite ? (Dany Mabillard)
09 Aug-07:45:29 Re: help needed for chinese locations (Dany Mabillard)
08 Aug-23:25:53 Re: don lum collection (Don Lum)

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  Topic: Calcite ?
SteveB

Replies: 4
Views: 195

PostForum: What is it? - Where is it from?   Posted: Aug 10, 2020 00:30   Subject: Re: Calcite ?
Looks like a coated coral, likely fossilised with outer coating of calcite, possibly chalk. The smoothness is unnatural for Coral. But there are indications is not waterworn and crusty cavities I expe ...
  Topic: Opaque black Quartz, Locality info/matrix info?
SteveB

Replies: 21
Views: 2151

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 14, 2020 03:33   Subject: Re: Opaque black Quartz, Locality info/matrix info?
Well, I suggest you take your specimen in one day, find where a geology/chemical class is and just pop in after the session and say “hello” to the instructor for a start, let them know you’re not in t ...
  Topic: Opaque black Quartz, Locality info/matrix info?
SteveB

Replies: 21
Views: 2151

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 14, 2020 00:18   Subject: Re: Opaque black Quartz, Locality info/matrix info?
Yes white vinegar can be used as an acid test. Yes you are looking for bubbles, though it could be a fast reaction or a slow depending on the calcium amount present. I’m no expert but vinegar acidity ...
  Topic: Opaque black Quartz, Locality info/matrix info?
SteveB

Replies: 21
Views: 2151

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 13, 2020 19:49   Subject: Re: Opaque black Quartz, Locality info/matrix info?
I would guess some locality in China.
Wherever your example is from, the quartz looks like it has been irradiated; in my opinion, that is not natural smoky quartz. BOB

Can I ...
  Topic: Colorado Stone
SteveB

Replies: 9
Views: 889

PostForum: What is it? - Where is it from?   Posted: Jul 02, 2020 03:17   Subject: Re: Colorado Stone
I’m thinking along the lines of a kimberlite and possibly a gypsum for the white. You could try testing with Hydrochloric acid for reactions to help identify the minerals of the rocks.

Another thou ...
  Topic: Newest Specimen
SteveB

Replies: 12
Views: 1257

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jun 29, 2020 07:31   Subject: Re: Newest Specimen
It looks like slag to me, but only a guess.
I agree its very much slag, especially from those blurry photos showing ground dirt embedded in the underside of the glassy slag. Certainly not smokey quar ...
  Topic: Help getting started on geology with 7 year old. New find.
SteveB

Replies: 8
Views: 742

PostForum: What is it? - Where is it from?   Posted: Jun 28, 2020 00:39   Subject: Re: Help getting started on geology with 7 year old. New find.
I would keep that specimen, its interior is interesting, I’ve never seen that cottage cheese texture before and when you see specimens in books they are typically high grade examples rather than the l ...
  Topic: Pyrite?
SteveB

Replies: 11
Views: 1205

PostForum: What is it? - Where is it from?   Posted: Jun 26, 2020 23:16   Subject: Re: Pyrite?
You said you broke some in order to TAKE them, instead of taking memories only with a photo in place, you had to HAVE something for yourself denying others of enjoying them as nature intended. Excuses ...
  Topic: Pyrite?
SteveB

Replies: 11
Views: 1205

PostForum: What is it? - Where is it from?   Posted: Jun 25, 2020 20:17   Subject: Re: Pyrite?
Clean them ONLY by brushing gently with a dry brush. They are formed from mineral salts of FeS so liquids can dissolve them again destroying the delicate structure. I would admonish you and anyone for ...
  Topic: Mercedes cross in fluorite
SteveB

Replies: 9
Views: 1237

PostForum: Minerals and Mineralogy   Posted: Jun 20, 2020 17:32   Subject: Re: Mercedes cross in fluorite
Ok, I’m going to sound stupid on this, I think the main structural molecules use less energy and have chemical stability (time) to form their purest crystals without any impurities. Result is a clear ...
  Topic: Habit restriction of garnets
SteveB

Replies: 13
Views: 2541

PostForum: Minerals and Mineralogy   Posted: Jun 13, 2020 18:59   Subject: Re: Habit restriction of garnets
It’s interesting to consider. Its an area I’m very ignorant about, but my knowledge from other scientific disciplines sets me thinking along symmetries like chiral. Where the same molecular structure ...
  Topic: Habit restriction of garnets
SteveB

Replies: 13
Views: 2541

PostForum: Minerals and Mineralogy   Posted: Jun 13, 2020 14:20   Subject: Re: Habit restriction of garnets
I’m out of my depth with that paper and the answer to the question. Browsing it, and my gut instinct about molecular representations I’m wondering if it would be correct to say the Law of Bravais is o ...
  Topic: Possible Cairngorm?
SteveB

Replies: 3
Views: 846

PostForum: What is it? - Where is it from?   Posted: Jun 10, 2020 09:53   Subject: Re: Possible Cairngorm?
Cairngorm can't mean anything. It means smoky quartz. Quartz is far too common for anybody to say where this poor specimen might have come from. You could remove the paint and clean it up and i doubt ...
  Topic: Any interesting minerals from Ukraine?
SteveB

Replies: 18
Views: 2822

PostForum: Mines and Mineral Localities   Posted: May 31, 2020 06:01   Subject: Re: Any interesting minerals from Ukraine?
Certainly there are interesting minerals in every country on earth. Ukraine is in a region of war and politcal unrest in recent years so they've had plenty of other concerns than a mere hobby. No doub ...
  Topic: Is that a lodestone
SteveB

Replies: 3
Views: 743

PostForum: What is it? - Where is it from?   Posted: May 25, 2020 03:03   Subject: Re: Is that a lodestone
Not really, if it attracts regular iron then maybe iron. Many minerals attract magnets. Your test only shows an iron rich mineral and proves nothing. Starting with a mineral name is no way to id a sam ...
  Topic: Rose Quartz, Morganite or other?
SteveB

Replies: 9
Views: 1451

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 22, 2020 00:38   Subject: Re: Rose Quartz, Morganite or other?
Why don't you try fusibility? Beryl (morganite) is difficultly fusible while Quartz is infusible.

Dangerous and irresponsible advice. Quartz reacts explosively, he could easily end up blind taking ...
  Topic: Is this Phenakite?
SteveB

Replies: 5
Views: 922

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 21, 2020 01:13   Subject: Re: Is this Phenakite?
Use a proper set of hardness scribes to test.

I think Brent is on the right track with a garnet group. Your crystals exhibit some crystal structure common to garnets but an imperfect symmetrical de ...
  Topic: Rose Quartz, Morganite or other?
SteveB

Replies: 9
Views: 1451

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 21, 2020 00:58   Subject: Re: Rose Quartz, Morganite or other?
I would be confident it was rose quartz and I suspect Pete is correct about the seller playing games with you as they do. Might even be a cast off from Chinese quartz manufacturing process.

Still t ...
  Topic: This rock has me stumped!
SteveB

Replies: 7
Views: 1098

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 12, 2020 19:36   Subject: Re: This rock has me stumped!
looks like someone poured concrete into one of those speed ball punch bags. The shape, the seams its all there.
  Topic: Manufactured or natural?
SteveB

Replies: 8
Views: 3782

PostForum: What is it? - Where is it from?   Posted: Apr 20, 2020 12:44   Subject: Re: Manufactured or natural?
I completely agree with Bobs response. China = suspect is a common feeling and I guess their attitudes and history or being experts as faking anything for profit are going to take time to overcome. Re ...
 
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