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24 Sep-08:54:48 Re: collection of fiebre verde - quartz peñas blancas (#8810) (Fiebre Verde)
24 Sep-06:08:43 Re: need help identifying this rock (Susan Robinson)
24 Sep-04:10:04 Re: collection of tobi (Tobi)
23 Sep-20:27:34 Re: need help identifying this rock (Bob Harman)
23 Sep-14:51:02 Re: need help identifying this rock (Gone Fishing)
23 Sep-13:42:45 Re: collection of tobi (Am Mizunaka)
23 Sep-12:59:43 Re: the mizunaka collection (Am Mizunaka)
23 Sep-12:23:44 Re: collection of michael shaw (Crosstimber)
23 Sep-11:19:18 Re: help me identify these rocks/minerals (Alfredo)
23 Sep-11:03:35 Re: help me identify these rocks/minerals (Borg_jos)
23 Sep-10:55:20 Re: new generation for picture - ploum (Ploum)
23 Sep-10:52:47 Re: help me identify these rocks/minerals (Mike Chontofalsky)
23 Sep-10:22:52 Re: help me identify these rocks/minerals (Bob Harman)
23 Sep-10:14:27 Help me identify these rocks/minerals (Borg_jos)
23 Sep-09:14:30 Re: collection of heimo hellwig (Heimo Hellwig)
23 Sep-06:00:36 Re: collection of tobi (Tobi)
23 Sep-04:35:17 Re: collection of tobi (Tobi)
23 Sep-04:10:54 Re: new generation for picture - ploum (Ploum)
23 Sep-03:36:25 Re: carlos pareja photo collection (Carlos Pareja)
23 Sep-01:39:10 Re: the mim museum in beirut, lebanon (Tobi)
23 Sep-01:36:07 Re: the mizunaka collection (Tobi)
22 Sep-17:22:54 Re: franjungle collection (Franjungle)
22 Sep-14:45:44 The mizunaka collection - fluorite (Am Mizunaka)
22 Sep-10:22:43 Re: someone told me this is what happens to mud at the bottom of a lake (Bob Carnein)
22 Sep-10:14:32 Re: someone told me this is what happens to mud at the bottom of a lake (Vic Rzonca)

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  Topic: Help me identify this rock
marco campos-venuti

Replies: 1
Views: 198

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 05, 2017 17:20   Subject: Re: Help me identify this rock
Fluorite cleavage crystal, possibly from China.
  Topic: Need help ID the inclusions of these phantom quartz
marco campos-venuti

Replies: 12
Views: 622

PostForum: What is it? - Where is it from?   Posted: Sep 04, 2017 11:52   Subject: Re: Need help ID the inclusions of these phantom quartz
I'm with you that your last specimen looks natural.
  Topic: Need help ID the inclusions of these phantom quartz
marco campos-venuti

Replies: 12
Views: 622

PostForum: What is it? - Where is it from?   Posted: Sep 04, 2017 11:49   Subject: Re: Need help ID the inclusions of these phantom quartz
I told you dying is just the most diffused opinion. The experts in quartz inclusions are not sure. But you agree that some of them are dyed because you have a dyed quartz in your hand. And you can com ...
  Topic: Need help ID the inclusions of these phantom quartz
marco campos-venuti

Replies: 12
Views: 622

PostForum: What is it? - Where is it from?   Posted: Sep 04, 2017 11:07   Subject: Re: Need help ID the inclusions of these phantom quartz
Vermicular growth of chlorite gives perfect and intricate ways for the dye to enter the stone. Just make an experiment and you will be easily convinced. Some isolated portion remain of their original ...
  Topic: Need help ID the inclusions of these phantom quartz
marco campos-venuti

Replies: 12
Views: 622

PostForum: What is it? - Where is it from?   Posted: Sep 04, 2017 10:08   Subject: Re: Need help ID the inclusions of these phantom quartz
Hi,
what you have is a "Lodo Quartz" from Brasil and cut in China (typical cut). All the inclusions are chlorite group minerals in a vermicular growing pattern. The paragenesis hypothesized ...
  Topic: Mannardite and Ankangite
marco campos-venuti

Replies: 4
Views: 798

PostForum: Minerals and Mineralogy   Posted: Aug 04, 2017 02:59   Subject: Re: Mannardite and Ankangite
I'm building a web page about quartz with inclusions with an educational area.
There is a page about ankangite-mannardite.
http://www.quartz-inclusions.com/
(link normalized by FMF)
  Topic: Is this jadeite or nephrite?
marco campos-venuti

Replies: 24
Views: 2117

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 03, 2017 18:29   Subject: Re: Is this jadeite or nephrite?
Jadeite pebbles shows white alteration skin. And they usually show green very rarely and in small spot inside a white mass.
In contrary nephrite presents big green masses.
If I had to choose only be ...
  Topic: Sainte Marie-aux-Mines Show 2017
marco campos-venuti

Replies: 59
Views: 19832

PostForum: News about shows   Posted: Jul 02, 2017 03:54   Subject: Re: Sainte Marie-aux-Mines Show 2017
Garnet
Sphalerite, I guess
  Topic: Specimen with screw-like object inside
marco campos-venuti

Replies: 10
Views: 1807

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jun 18, 2017 03:25   Subject: Re: Specimen with screw-like object inside
It is the internal cast of a piece of a crinoid stem. They are quite common fossils. But this is not the right forum.
  Topic: Need Help Identifying this Rock
marco campos-venuti

Replies: 1
Views: 609

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2017 01:27   Subject: Re: Need Help Identifying this Rock
Flint.
  Topic: Unknown mineral - Virgem da Lapa
marco campos-venuti

Replies: 7
Views: 1122

PostForum: What is it? - Where is it from?   Posted: Jun 12, 2017 17:16   Subject: Re: Unknown mineral - Virgem da Lapa
Striated faces are the sum of 1 cube face (6 faces) and 2 pyritohedron faces (12). For that reason they result curved.
  Topic: Unknown mineral - Virgem da Lapa
marco campos-venuti

Replies: 7
Views: 1122

PostForum: What is it? - Where is it from?   Posted: Jun 12, 2017 16:35   Subject: Re: Unknown mineral - Virgem da Lapa
I suggest this is a pyrite crystal, replaced by limonite. The shape is typical.
  Topic: A clue for this?
marco campos-venuti

Replies: 7
Views: 1438

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 08, 2017 18:15   Subject: Re: A clue for this?
I would say Enstatite.
  Topic: Favourite Pyrites?
marco campos-venuti

Replies: 21
Views: 3783

PostForum: Favorite Minerals   Posted: May 08, 2017 14:40   Subject: Re: Favourite Pyrites?
I know this is not the place for gemstones, but with crystals inside ......
  Topic: Smokey quartz location?
marco campos-venuti

Replies: 2
Views: 746

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 06, 2017 14:19   Subject: Re: Smokey quartz location?
It looks as a typical Arkansas irradiated quartz.
  Topic: Cristobalite with Osumilite or Hortonolite, Sardinia ?
marco campos-venuti

Replies: 8
Views: 1588

PostForum: What is it? - Where is it from?   Posted: May 03, 2017 12:15   Subject: Re: Cristobalite with Osumilite or Hortonolite, Sardinia ?
I found a very similar fayalite in mindat from Coso Hot Springs, Inyo Co., California.
  Topic: Cristobalite with Osumilite or Hortonolite, Sardinia ?
marco campos-venuti

Replies: 8
Views: 1588

PostForum: What is it? - Where is it from?   Posted: May 03, 2017 07:31   Subject: Re: Cristobalite with Osumilite or Hortonolite, Sardinia ?
Actually cordierite from this area is quite different. It shows elongated hexagonal prisms. The color is similar, but shape is not. I didn't found any citation for hortonolite, but why not?
  Topic: Cristobalite with Osumilite or Hortonolite, Sardinia ?
marco campos-venuti

Replies: 8
Views: 1588

PostForum: What is it? - Where is it from?   Posted: May 03, 2017 04:02   Subject: Re: Cristobalite with Osumilite or Hortonolite, Sardinia ?
I would say you have tridymite instead cristobalite. It is hexagonal.
  Topic: Cristobalite with Osumilite or Hortonolite, Sardinia ?
marco campos-venuti

Replies: 8
Views: 1588

PostForum: What is it? - Where is it from?   Posted: May 03, 2017 03:42   Subject: Re: Cristobalite with osumilite or hortonolite, Sardinia ?
This is not osumilite.
Osumilite is very constant in this deposit, is black, hexagonal and shows triaxial striations on pinacoid.
  Topic: Unknown mineral from Erongo mountains
marco campos-venuti

Replies: 29
Views: 4247

PostForum: What is it? - Where is it from?   Posted: Apr 13, 2017 11:11   Subject: Re: Unknown mineral from Erongo mountains
I would say torbernite.
 
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