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18 Jun-06:41:45 Question regarding portuguese minerals (Liaemars)
18 Jun-03:33:29 Re: my collection of crystals (Pierre Joubert)
18 Jun-03:26:36 Which locality? (Mathias)
18 Jun-00:26:50 Re: collection of heimo hellwig (Heimo Hellwig)
17 Jun-23:05:43 The mizunaka collection - rhodochrosite (Am Mizunaka)
17 Jun-12:53:29 Re: franjungle collection (Franjungle)
17 Jun-10:18:10 Re: micro photos of inclusions in quartz (Zbhjzm)
17 Jun-09:07:25 Re: micro photos of inclusions in quartz (Alfredo)
17 Jun-08:38:20 Re: micro photos of inclusions in quartz (Bob Harman)
17 Jun-03:04:09 Re: micro photos of inclusions in quartz (Zbhjzm)
16 Jun-22:09:03 Re: hairlike gold inclusions in quartz?? (Zbhjzm)
16 Jun-17:47:24 Re: tucson show 2018 (Greg Lilly)
16 Jun-16:53:34 Re: don lum collection (Don Lum)
16 Jun-16:02:35 Re: my collection of crystals (Bob Harman)
16 Jun-15:42:49 Re: my collection of crystals (Kaleb)
16 Jun-15:24:15 Re: my collection of crystals (Kevin Schofield)
16 Jun-15:04:04 Re: hairlike gold inclusions in quartz?? (Alfredo)
16 Jun-15:03:33 Re: what crystal is this (Bob Harman)
16 Jun-14:57:37 Re: what crystal is this (Lluis)
16 Jun-14:52:19 Re: my collection of crystals (Bob Harman)
16 Jun-14:17:44 My collection of crystals (Kaleb)
16 Jun-14:14:10 Re: sainte marie-aux-mines show 2018 (Philippe Durand)
16 Jun-14:00:20 The mizunaka collection - quartz (Am Mizunaka)
16 Jun-13:37:50 Re: what crystal is this (Kaleb)
16 Jun-13:33:19 Sainte marie-aux-mines show 2018 - creating a show (Jordi Fabre)

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  Topic: Agates in Sicily?
marco campos-venuti

Replies: 9
Views: 1200

PostForum: Rockhounding trips   Posted: Apr 25, 2018 11:16   Subject: Re: Agates in Sicily
Bad News Alan, no agates in Sicily!!!
Despite the tradition wants that the name agate comes from the old name of the Drillo River, a small creek passing near Etna Volcano, there was probably a big hi ...
  Topic: Faden Quartz Crystals - (26)
marco campos-venuti

Replies: 48
Views: 20816

PostForum: Featured Columns of FMF   Posted: Dec 15, 2017 11:28   Subject: Re: Faden Quartz Crystals - (26)
Hi Roger,
I consider we are at the same side of the theories, as anti-official. But something in your discussion sounds strange to me.
A gel is a solid and for that reason can't have viscosity that ...
  Topic: Information about a Rhodochrosite specimen
marco campos-venuti

Replies: 3
Views: 1541

PostForum: Minerals and Mineralogy   Posted: Nov 18, 2017 09:16   Subject: Re: Information about a Rhodochrosite specimen
Check mindat:
https://www.mindat.org/photo-519101.html
Wutong Mine (Wudong Mine), Liubao, Cangwu Co., Wuzhou Prefecture, Guangxi Zhuang Autonomous Region, China
  Topic: Assistance in getting locality info for this Mexican? orthoclase & amphibole specimen
marco campos-venuti

Replies: 4
Views: 1258

PostForum: What is it? - Where is it from?   Posted: Nov 18, 2017 06:31   Subject: Re: Assistance in getting locality info for this Mexican? orthoclase & amphibole speci
I found a specimen in mindat from Durango with very similar appearance, labeled orthoclase with horneblende. Photo is by Rock Currier and specimen is from the collection of Miguel Romero.
mindat.org/ ...
  Topic: Micro photos of inclusions in Quartz
marco campos-venuti

Replies: 71
Views: 15758

PostForum: Micros & Macros - Images of Minerals   Posted: Nov 14, 2017 06:50   Subject: Re: Micro photos of inclusions in Quartz
I have one sample of the blue inclusion. I'm not sure it is natural or synthetic quartz. No info about any deposit.
  Topic: Super thin hematite inclusions in amethyst
marco campos-venuti

Replies: 22
Views: 4930

PostForum: Micros & Macros - Images of Minerals   Posted: Nov 13, 2017 04:21   Subject: Re: Super thin hematite inclusions in amethyst
It is from Rome!
(We are joking, come back to the topic please)
  Topic: Super thin hematite inclusions in amethyst
marco campos-venuti

Replies: 22
Views: 4930

PostForum: Micros & Macros - Images of Minerals   Posted: Nov 12, 2017 12:44   Subject: Re: Super thin hematite inclusions in amethyst
And here is what we call Quartz with iron oxides, because we don't know what it really is. Also from Minas Gerais
  Topic: Super thin hematite inclusions in amethyst
marco campos-venuti

Replies: 22
Views: 4930

PostForum: Micros & Macros - Images of Minerals   Posted: Nov 12, 2017 12:41   Subject: Re: Super thin hematite inclusions in amethyst
And here few examples of what I consider Goethite in Quartz. I'm not sure, just is what I use to call it. Mostly yellow and strictly fibrous, more abundant in Amethyst. All samples from Brazil.
The l ...
  Topic: Super thin hematite inclusions in amethyst
marco campos-venuti

Replies: 22
Views: 4930

PostForum: Micros & Macros - Images of Minerals   Posted: Nov 12, 2017 12:31   Subject: Re: Super thin hematite inclusions in amethyst
Few examples of what I suppose is Hematite in Quartz. Mostly red, main characteristic is a flat crystal, more or less elongated.
All sample are from Brazil, difficult to say the exact place. How woul ...
  Topic: Super thin hematite inclusions in amethyst
marco campos-venuti

Replies: 22
Views: 4930

PostForum: Micros & Macros - Images of Minerals   Posted: Nov 12, 2017 12:18   Subject: Re: Super thin hematite inclusions in amethyst
John, is it possible to distinguish fibrous Hematite from fibrous Goethite with the naked eye? I mean not included in quartz but when they are in botryoidal shape. I suspect there is a bit of confusio ...
  Topic: Question about Sphalerite from Spain?
marco campos-venuti

Replies: 11
Views: 2341

PostForum: What is it? - Where is it from?   Posted: Nov 09, 2017 04:03   Subject: Re: question about Sphalerite from Spain
Doesn't looks Spanish. Small and numerous crystals, very dark and slightly elongated shape.
  Topic: Rarest quartz twins with inclined axes C
marco campos-venuti

Replies: 38
Views: 8710

PostForum: Minerals and Mineralogy   Posted: Nov 08, 2017 20:27   Subject: Re: Rarest quartz twins with inclined axes C
I think auto-epitaxy is a synonym of twinning. Epitaxy is between two different minerals.
If a secondary xl (or a epitaxial film) grows over a main xl, its atoms will continue the lattice of the firs ...
  Topic: Rarest quartz twins with inclined axes C
marco campos-venuti

Replies: 38
Views: 8710

PostForum: Minerals and Mineralogy   Posted: Nov 08, 2017 19:25   Subject: Re: Rarest quartz twins with inclined axes C
I mean that often it can be a twin instead of an accident.
  Topic: Rarest quartz twins with inclined axes C
marco campos-venuti

Replies: 38
Views: 8710

PostForum: Minerals and Mineralogy   Posted: Nov 08, 2017 15:33   Subject: Re: Rarest quartz twins with inclined axes C
John, I think that when two crystals grow over a matrix, many different forces interact. In contrary, when a second crystal grows over a face of a first crystal, its orientation depends mainly by atom ...
  Topic: Fluorite habit
marco campos-venuti

Replies: 5
Views: 1929

PostForum: Minerals and Mineralogy   Posted: Nov 04, 2017 19:06   Subject: Re: Fluorite habit
It looks as a purple cube with a clear interior. The two faces are cleavage faces showing the interior of the crystal, cutting two vertex of the cube.
  Topic: One of a kind
marco campos-venuti

Replies: 9
Views: 1926

PostForum: What is it? - Where is it from?   Posted: Oct 30, 2017 02:49   Subject: Re: One of a kind
Wow! A message in a stone!
Despite its incredible unusual text, this stone is a piece of a septaria, common near Glenn or South Haven, MI. Also called Lighting Stones, they are concretions of devonia ...
  Topic: Rarest quartz twins with inclined axes C
marco campos-venuti

Replies: 38
Views: 8710

PostForum: Minerals and Mineralogy   Posted: Oct 23, 2017 15:39   Subject: Re: Rarest quartz twins with inclined axes C
The prism of both crystals has a face parallel to the picture.
The crystal B is rotated 50 degrees in respect with A, that is the same angle between the prism and the rhombohedron, resulting that the ...
  Topic: Scepters - (1)
marco campos-venuti

Replies: 81
Views: 74203

PostForum: Featured Columns of FMF   Posted: Oct 23, 2017 13:26   Subject: Re: Scepters - (1)
Some more specimens.
  Topic: Rarest quartz twins with inclined axes C
marco campos-venuti

Replies: 38
Views: 8710

PostForum: Minerals and Mineralogy   Posted: Oct 23, 2017 13:05   Subject: Re: Rarest quartz twins with inclined axes C
Hi, I have a strange group of crystals of irradiated quartz from Arkansas.
The crystal A lays on the matrix. The crystal B grows from a rhombohedron face of crystal A. A and B crystals share a plane ...
  Topic: Mineralogical Museum Luigi Celleri (MUM) of San Piero in Campo in Elba Island, Italy
marco campos-venuti

Replies: 5
Views: 2575

PostForum: Worlwide Museums & Visits to Museums and private collections   Posted: Oct 20, 2017 11:37   Subject: Re: Mineralogical Museum Luigi Celleri (MUM) of San Piero in Campo in Elba Island, Italy
I just want to add the photo of the man to whom the museum is dedicated: Luigi Celleri (San Piero in Campo, 6- 5-1828, San Piero in Campo, 4-21-1900) . A real rockhound.
 
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