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02 Feb-15:58:46 Re: collection of enrique llorens (Enrique Llorens)
02 Feb-15:55:47 Re: collection of enrique llorens (Enrique Llorens)
02 Feb-13:20:47 Re: collection of enrique llorens (Edelmin)
02 Feb-10:12:02 Re: one that has been in my collection for 45 years (James Catmur)
02 Feb-09:32:36 Re: one that has been in my collection for 45 years (Pete Richards)
02 Feb-09:04:12 Re: one that has been in my collection for 45 years (James Catmur)
02 Feb-08:56:11 Re: one that has been in my collection for 45 years (Pete Richards)
02 Feb-08:40:48 One that has been in my collection for 45 years (James Catmur)
02 Feb-06:59:38 Re: collection of enrique llorens (Enrique Llorens)
02 Feb-05:06:33 The mizunaka collection - quartz (Am Mizunaka)
02 Feb-00:19:11 Re: collection of volkmar stingl (Volkmar Stingl)
01 Feb-22:09:34 Re: interesting fake cavansite (Alfredo)
01 Feb-21:28:54 Re: interesting fake cavansite (Steveb)
01 Feb-20:10:13 Re: interesting fake cavansite (Alfredo)
01 Feb-15:24:55 Interesting fake cavansite (Joseph Doliveira)
01 Feb-13:29:04 Re: don lum collection (Don Lum)
01 Feb-05:29:05 Re: the mim museum in beirut, lebanon (Mim Museum)
31 Jan-23:14:26 Re: tucson shows 2023 - let the fun begin (Joseph Doliveira)
31 Jan-23:07:16 Re: don lum collection (Don Lum)
31 Jan-17:47:03 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
31 Jan-11:55:44 Re: collection of enrique llorens (Enrique Llorens)
31 Jan-10:37:08 Re: collection of michael shaw (Michael Shaw)
31 Jan-10:26:39 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
31 Jan-09:39:38 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
31 Jan-09:33:02 Re: tucson shows 2023 - let the fun begin (Bob Kerr)

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  Topic: Pebbles from Elba, containing... tourmaline?
marco campos-venuti

Replies: 4
Views: 814

PostForum: What is it? - Where is it from?   Posted: Nov 16, 2022 04:11   Subject: Re: Pebbles from Elba, containing... tourmaline?
I realized there is an intruder in your pile of rocks. It is a brecciated marl from the Elba Flysch (Cretaceous). The white stripes are of calcite.
  Topic: Pebbles from Elba, containing... tourmaline?
marco campos-venuti

Replies: 4
Views: 814

PostForum: What is it? - Where is it from?   Posted: Nov 16, 2022 03:56   Subject: Re: Pebbles from Elba, containing... tourmaline?
The pebbles are from Capo Bianco beach, north of the Island, near Portoferraio and are constituted by the Capo bianco aplite dike dated 8.4 My, before the main granodiorite pluton of Monte Capanne dat ...
  Topic: Tourmaline - Quartz epitaxy?
marco campos-venuti

Replies: 7
Views: 2099

PostForum: Minerals and Mineralogy   Posted: Apr 23, 2022 06:02   Subject: Re: Tourmaline - Quartz epitaxy?
The pocket contained several hundred crystals, all with their respective tourmaline in the center and with the same orientation. I had the opportunity to measure some of them and they all gave values ...
  Topic: Forms Involved in Titanite Crystal
marco campos-venuti

Replies: 19
Views: 5525

PostForum: Minerals and Mineralogy   Posted: Apr 22, 2022 14:58   Subject: Re: Forms Involved in Titanite Crystal
I have an untwinned single crystal of titanite from that area. I had it as from Mohmand Agency, Pakistan, not really near, but you know stones in these mountains walk with nomad peoples. It has many s ...
  Topic: Tourmaline - Quartz epitaxy?
marco campos-venuti

Replies: 7
Views: 2099

PostForum: Minerals and Mineralogy   Posted: Apr 22, 2022 14:12   Subject: Re: Tourmaline - quartz epitaxy?
In a paper published years ago, I suggested the possibility of quartz epitaxy after tourmaline at an angle of 23.5°. I took these data from a group of quartz crystals probably found in Morro Redondo, ...
  Topic: Minerals and mysteries from a college collection
marco campos-venuti

Replies: 9
Views: 3915

PostForum: What is it? - Where is it from?   Posted: Oct 20, 2021 06:20   Subject: Re: Minerals and mysteries from a college collection
There are many minerals making nodules with the same fabric. Barite also is a good guess, you can check density.
  Topic: April shows in Tucson??
marco campos-venuti

Replies: 10
Views: 8152

PostForum: Mineral Shows by Gail Spann   Posted: Dec 16, 2020 12:26   Subject: Re: April shows in Tucson??
GJX is not planning on having an April show as they "feel things won’t be much different than they are now".
  Topic: Interesting find, opalized scoria from oregon
marco campos-venuti

Replies: 1
Views: 2556

PostForum: What is it? - Where is it from?   Posted: Sep 18, 2020 05:31   Subject: Re: Interesting find, opalized scoria from oregon
Scorias are often filled by silica because cavities drain water. It is difficult to find empty cavities in old scorias from the geological record. More often they are filled by something, zeolites, ca ...
  Topic: Quartz and Humboldtine? from Colombia
marco campos-venuti

Replies: 16
Views: 19401

PostForum: Minerals and Mineralogy   Posted: Oct 07, 2018 12:20   Subject: Re: Quartz and Humboldtine? from Colombia
I bought this in 2006, supposedly from Brazil. It looks so similar!
Here the yellow appears to be inside. The vermicular growth reminds me of chlorite family minerals. The yellow is brighter in real ...
  Topic: Who to trust with gemstone identification? Are some gemologists better than others?
marco campos-venuti

Replies: 11
Views: 17830

PostForum: Incorrect classification and fakes   Posted: Sep 07, 2018 06:28   Subject: Re: Who to trust with gemstone identification? Are some gemologists better than others?
The distinction from natural citrine and heat treated amethyst is possible with expensive test in a high tech laboratory. Because citrine is a cheap stone, dealers assume all citrine in the market are ...
  Topic: Termination in a tourmaline crystal
marco campos-venuti

Replies: 2
Views: 5221

PostForum: Minerals and Mineralogy   Posted: Aug 28, 2018 08:37   Subject: Termination in a tourmaline crystal
I had this green tourmaline crystal on a recent trip to Brazil. It comes from Barra de Salinas pegmatite. It seems to me a quite unusual termination. Most of crystals from pegmatites have a lower symm ...
  Topic: Abrasives repairing polishing crystals
marco campos-venuti

Replies: 11
Views: 12288

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Aug 18, 2018 17:34   Subject: Re: Abrasives repairing polishing crystals
Of course natural is better as for hair, nose, breast, etc. But in some cases you want to save a specimen. Because of sentiment, because it is very valuable or because it is an educational specimen. I ...
  Topic: Agates in Sicily?
marco campos-venuti

Replies: 9
Views: 18619

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: 63
Views: 92635

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: 7171

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: Micro photos of inclusions in Quartz
marco campos-venuti

Replies: 108
Views: 116294

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: 27662

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: 27662

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: 27662

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: 27662

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 ...
 
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