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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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Author Message
  Topic: Article on nucleation and crystallization of Naica in Chem Soc Rev
gemlover

Replies: 1
Views: 2853

PostForum: Minerals and Mineralogy   Posted: Mar 18, 2014 05:22   Subject: Re: Article on nucleation and crystallization of Naica in Chem Soc Rev
Thank you for publishing this extremely interesting article. a quick scan when it downloaded showed me that is would be a great read. Thanks again,

John
  Topic: Corundum var. Sapphire and Ruby from same locality
gemlover

Replies: 10
Views: 12835

PostForum: Minerals and Mineralogy   Posted: Feb 24, 2014 02:21   Subject: Re: Corundum var. Sapphire and Ruby from same locality
Yes, ruby and sapphire can occur in the same locality. Check out the geology of Franklin, NC (natural ruby and sapphire mines) then that trends NE to the Hiddenite NC area (emeralds).

john
  Topic: New finds in Chatham County, NC
gemlover

Replies: 7
Views: 7629

PostForum: Mines and Mineral Localities   Posted: Feb 14, 2014 14:01   Subject: Re: New finds in Chatham County, NC
The gallery has Wake and Randolph counties with samples, no mention in the gallery of Chatham County. The link is dead. and yes i did change the "dot" into "."

john
  Topic: Collection of John Atwell Rasmussen
gemlover

Replies: 1
Views: 4966

PostForum: Collection photos and Collector's page   Posted: Jan 18, 2014 23:12   Subject: Re: Collection of John Atwell Rasmussen
Fluorite crystals covered with bitumen (natural petroleum product) from Hardin County, Illinois USA. The sample measures 55 x 50 x 40 mm.
  Topic: Cleaning an Amethyst !!!
gemlover

Replies: 11
Views: 11472

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Jan 12, 2014 16:59   Subject: Re: Cleaning an Amethyst !!!
First, warm water, soap and a soft toothbrush

then, if you need to do additional cleaning, especially rust stains -- oxalic acid soak -- but be careful with acids and use gloves, eye protection, et ...
  Topic: A hardness gemologist tool
gemlover

Replies: 11
Views: 10759

PostForum: Off-Topic and Introductions   Posted: Jan 09, 2014 02:08   Subject: Re: a hardness gemologist tool
We used wheels like this in my mineralogy course in college (50 years ago). I have not seen one since then. Thanks for the memories. BTW, a gemologist would not use this, as we don't scratch the cu ...
  Topic: Color change minerals
gemlover

Replies: 6
Views: 5512

PostForum: Minerals and Mineralogy   Posted: Jan 05, 2014 16:48   Subject: Re: Color change minerals
Great picture. Thanks Roger. I have not seen this excellent color change documentation on any of my gemology sites.

john
  Topic: Method of Making a Custom Mineral Mount
gemlover

Replies: 5
Views: 7470

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Dec 25, 2013 19:23   Subject: Re: Method of Making a Custom Mineral Mount
Thanks for the great illustrations for this method.

John
  Topic: The rarest twin of calcite, a Chinese specimen
gemlover

Replies: 4
Views: 6055

PostForum: Minerals and Mineralogy   Posted: Oct 06, 2013 11:12   Subject: Re: The rarest twin of calcite, a Chinese specimen
And i can easily see the bishop's mitre. great posting, thanks. i still have great difficulty visualizing crystal planes, your graphics are a wonderful help.

john
  Topic: Hazards of prospecting for mineral specimens and snakes
gemlover

Replies: 19
Views: 22004

PostForum: Off-Topic and Introductions   Posted: Sep 08, 2013 20:52   Subject: Re: Hazards of prospecting for mineral specimens and snakes
Maine good, the only state that has never had a native pit viper in it. All other states in US have at least one pit viper in it. Here in SC we have all four types. Fortunately, the coral snakes on ...
  Topic: Why an organic substance should not be called a mineral?
gemlover

Replies: 18
Views: 29494

PostForum: Incorrect classification and fakes   Posted: Sep 05, 2013 06:09   Subject: Re: Why an organic substance should not be called a mineral?
Because a chemical compound is produced by an organic animal/plant does not make it an organic compound. Whevellite does not have an organic formula, and it is produced by hydrothermal activity (as w ...
  Topic: Why an organic substance should not be called a mineral?
gemlover

Replies: 18
Views: 29494

PostForum: Incorrect classification and fakes   Posted: Sep 04, 2013 22:04   Subject: Re: why an organic substance should not be called a mineral
What organic compound are you considering to have a crystalline structure (not chemical formula, actual crystals)?

John
  Topic: Movie about volcanic and hydrothermal in New Zealand
gemlover

Replies: 5
Views: 5620

PostForum: Off-Topic and Introductions   Posted: Sep 04, 2013 09:03   Subject: Re: Movie about volcanic and hydrothermal in New Zealand
Thank you for the fantastic vision of New Zealand's geothermal activity. Your presentation was absolutely beautiful. I loved it.

John
  Topic: Movie about volcanic and hydrothermal in New Zealand
gemlover

Replies: 5
Views: 5620

PostForum: Off-Topic and Introductions   Posted: Sep 04, 2013 06:26   Subject: Re: Movie about volcanic and hydrothermal in New Zealand
Write out the link in words. Example my email address would be:

john at rasmussengems dot com

then one of the moderators will change to URL or reader can do same.

John
  Topic: Ecole des Mines - Paris
gemlover

Replies: 3
Views: 7259

PostForum: École des Mines de Paris (Paris School of Mines)   Posted: Aug 24, 2013 04:37   Subject: Re: Ecole des Mines - Paris
Very nice set of photos. sometimes it is great to see the pieces not in a professional display shot.

john
  Topic: Presentation of new members - Reference Thread
gemlover

Replies: 426
Views: 283980

PostForum: Off-Topic and Introductions   Posted: Aug 11, 2013 18:21   Subject: Re: Presentation of new members - Hello from France (Stéphane Maury)
Bonjour,

that about uses up my abilities in the French language. Welcome to the forum.

John
  Topic: El Tule Mine, Melchor Musquiz, Coahuila, Mexico
gemlover

Replies: 7
Views: 12158

PostForum: Mines and Mineral Localities   Posted: Jul 30, 2013 21:37   Subject: Re: El Tule Mine, Melchor Musquiz, Coahuila Mexico
those are fantastic looking specimens. thank you,

john
  Topic: Calcite with an interesting termination - from a parking lot
gemlover

Replies: 5
Views: 7022

PostForum: Mines and Mineral Localities   Posted: Jul 27, 2013 05:18   Subject: Re: Calcite with an interesting termination - from a parking lot
How about a "truncation?"
  Topic: Collection of John Atwell Rasmussen
gemlover

Replies: 1
Views: 4966

PostForum: Collection photos and Collector's page   Posted: Jul 23, 2013 14:24   Subject: Collection of John Atwell Rasmussen
Black Schorl Tourmaline crystals imbedded in feldspar matrix. Sample found in vicinity of Cherokee, NC
  Topic: Gold in Quartz
gemlover

Replies: 14
Views: 10545

PostForum: Minerals and Mineralogy   Posted: Jul 18, 2013 11:48   Subject: Re: Gold in Quartz
Nice one Ben, unfortunately, most assayers are not located in NC. You might be able to locate someone who could evaluate the commercial value of your ore. Check with one of your local geology depart ...
 
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