For general comments about the site http://www.mindat.org/msgboard-6.html Thu, 23 May 2013 12:31:12 +0000 Phorum 5.2.15a http://www.mindat.org/forum.php?read,6,294537,294550#msg-294550 http://www.mindat.org/forum.php?read,6,294537,294550#msg-294550 Tomasz Praszkier General Thu, 23 May 2013 09:59:14 +0000 http://www.mindat.org/forum.php?read,6,294537,294546#msg-294546 http://www.mindat.org/forum.php?read,6,294537,294546#msg-294546 David Von Bargen General Thu, 23 May 2013 09:43:37 +0000 http://www.mindat.org/forum.php?read,6,294537,294537#msg-294537 http://www.mindat.org/forum.php?read,6,294537,294537#msg-294537
See: [www.facebook.com]

"For the first time we will have a meeting with 4 speeches connected with the topic of the main exhibition - American Minerals. Event will be open for public.

Meeting will be in Friday afternoon in Church Saint Louis (5 rue Saint Louis)!!!!! So Mindat in church - sounds like a new religion... ;-)

Speeches:

Mining California tourmalines
By Bill Larson

Famous California mineral localities
By John Veevaert

Collecting Yukon phosphates (Rapid Creek), Canada
by Mark Mauthner

Gold from Round Mountain, Nevada, USA (this one can change)
by Scott Werschky

How many mindat believers... sorry members we can expect? Please "join it" on facebook so we can estimate number of people."

Here you can see location of the church on google map: [goo.gl]]]> Jolyon & Katya Ralph General Thu, 23 May 2013 07:54:56 +0000 http://www.mindat.org/forum.php?read,6,289382,294502#msg-294502 http://www.mindat.org/forum.php?read,6,289382,294502#msg-294502
Speaking of Colorado prospecting below is a link to "the great diamond hoax" that occurred in far NW Colorado after the civil war, and involved some very famous people. It is nicely documented in the Smithonian magazine article. The search for the earth's riches goes way back, and always seems to involve some dicey characters.

[www.smithsonianmag.com]]]> Vincent Rigatti General Wed, 22 May 2013 21:39:29 +0000 http://www.mindat.org/forum.php?read,6,289382,294476#msg-294476 http://www.mindat.org/forum.php?read,6,289382,294476#msg-294476 Alan Weigand General Wed, 22 May 2013 14:01:49 +0000 http://www.mindat.org/forum.php?read,6,294404,294427#msg-294427 http://www.mindat.org/forum.php?read,6,294404,294427#msg-294427 GEO 2000 [www.geo2000.pt]
ESPADARTE [www.espadarte-lda.com]
I suggest a previous contact by e-mail with some information about what you are looking for.
Cheers
Rui Nunes]]> Rui Nunes General Tue, 21 May 2013 19:40:37 +0000 http://www.mindat.org/forum.php?read,6,294406,294406#msg-294406 http://www.mindat.org/forum.php?read,6,294406,294406#msg-294406
Cheers,

Charles]]> Chas Miller General Tue, 21 May 2013 16:44:52 +0000 http://www.mindat.org/forum.php?read,6,294404,294404#msg-294404 http://www.mindat.org/forum.php?read,6,294404,294404#msg-294404
Many thanks.]]> Chas Miller General Tue, 21 May 2013 16:30:19 +0000 http://www.mindat.org/forum.php?read,6,294358,294396#msg-294396 http://www.mindat.org/forum.php?read,6,294358,294396#msg-294396 Keith Wood General Tue, 21 May 2013 15:29:58 +0000 http://www.mindat.org/forum.php?read,6,294341,294383#msg-294383 http://www.mindat.org/forum.php?read,6,294341,294383#msg-294383
Uwe]]> Uwe Ludwig General Tue, 21 May 2013 13:10:39 +0000 http://www.mindat.org/forum.php?read,6,294341,294376#msg-294376 http://www.mindat.org/forum.php?read,6,294341,294376#msg-294376 [webmineral.com]]]> Simone Citon General Tue, 21 May 2013 09:38:44 +0000 http://www.mindat.org/forum.php?read,6,294358,294367#msg-294367 http://www.mindat.org/forum.php?read,6,294358,294367#msg-294367 Alfredo Petrov General Tue, 21 May 2013 03:12:11 +0000 http://www.mindat.org/forum.php?read,6,294358,294363#msg-294363 http://www.mindat.org/forum.php?read,6,294358,294363#msg-294363
If you search google images for "graphic granite" there are similar photos.

John T]]> John Truax General Tue, 21 May 2013 01:31:02 +0000 http://www.mindat.org/forum.php?read,6,294358,294358#msg-294358 http://www.mindat.org/forum.php?read,6,294358,294358#msg-294358 had somebody met before such structures of joint growth of montebrasite (white) and quartz (grey) from pegmatites:
[attachment 45531 graphic.jpg]

May be you saw such aggregates on illustrations to some article or in some book? Was such structures some time described at all?

Thank you in advance!
Pavel]]> Pavel Kartashov General Mon, 20 May 2013 21:58:56 +0000 http://www.mindat.org/forum.php?read,6,294341,294352#msg-294352 http://www.mindat.org/forum.php?read,6,294341,294352#msg-294352 Rob Woodside General Mon, 20 May 2013 19:19:14 +0000 http://www.mindat.org/forum.php?read,6,294057,294347#msg-294347 http://www.mindat.org/forum.php?read,6,294057,294347#msg-294347 Doug Daniels General Mon, 20 May 2013 18:08:59 +0000 http://www.mindat.org/forum.php?read,6,294341,294345#msg-294345 http://www.mindat.org/forum.php?read,6,294341,294345#msg-294345 Simone Citon General Mon, 20 May 2013 17:48:11 +0000 http://www.mindat.org/forum.php?read,6,294341,294343#msg-294343 http://www.mindat.org/forum.php?read,6,294341,294343#msg-294343
the German specimens with crystals of native arsenic looks not similar like the Japanese Arsenic crystal balls. But the Japanese arsenic balls was ship in the 19th century in large quantity´s to Germany to process them in to rat poison. At this time and later many of the Japanese arsenic balls come in to collections.

Best wishes

Gunnar]]> Gunnar Färber General Mon, 20 May 2013 17:19:12 +0000 http://www.mindat.org/forum.php?read,6,294341,294341#msg-294341 http://www.mindat.org/forum.php?read,6,294341,294341#msg-294341 Jasun D. McAvoy General Mon, 20 May 2013 16:00:48 +0000 http://www.mindat.org/forum.php?read,6,294057,294337#msg-294337 http://www.mindat.org/forum.php?read,6,294057,294337#msg-294337 William Cordua General Mon, 20 May 2013 15:51:28 +0000 http://www.mindat.org/forum.php?read,6,294057,294298#msg-294298 http://www.mindat.org/forum.php?read,6,294057,294298#msg-294298
I will be coming through Baldwin in July on my way to the Keweenaw, so we'll definitely stop by and have a look at rock. If nothing else, I'd like to get a few photos of it......]]> Paul Brandes General Mon, 20 May 2013 00:49:47 +0000 http://www.mindat.org/forum.php?read,6,294057,294293#msg-294293 http://www.mindat.org/forum.php?read,6,294057,294293#msg-294293
If you get by Baldwin this summer, look me up and we'll go visit the "rock" together.]]> Bill Cordua General Sun, 19 May 2013 22:23:50 +0000 http://www.mindat.org/forum.php?read,6,294057,294292#msg-294292 http://www.mindat.org/forum.php?read,6,294057,294292#msg-294292 Keith Wood General Sun, 19 May 2013 22:09:04 +0000 http://www.mindat.org/forum.php?read,6,294057,294277#msg-294277 http://www.mindat.org/forum.php?read,6,294057,294277#msg-294277 -------------------------------------------------------
> I do think these pretty much have to
> be from south of Lake Superior, as ice flow was
> generally radially away from the lake. The source
> is likely under forest, lake or swamp now.

Not true. The actual centre of the Laurentide Ice Sheet was near present day Hudson Bay and flowed to the south and west scouring out Lakes Superior, Michigan, and Huron. Further proof of this is that we find fossils along the southern shores of Lake Superior that we know came from Hudson Bay, granite erratics in northern Lower Michigan when the closest granite outcrops are several hundred miles to the north in Ontario, and the presence of Lorrain Jasper Conglomerates along the beaches of northeast Lower Michigan that came from near Bruce Mines, Ontario. There is no reason why these porphyritic boulders couldn't have also traveled many miles from their source to where they were found in Wisconsin.

Keith,
I suppose it is possible that these were widespread, but if they were why don't we see more of these rocks scattered about along the Canadian border and points south? I just don't see the evidence for this. To me it makes more sense (given what conditions these rocks formed under) that these are very localised in only a handfull of spots on the North American continent.

Just food for thought here! :-)]]> Paul Brandes General Sun, 19 May 2013 19:02:21 +0000 http://www.mindat.org/forum.php?read,6,294271,294271#msg-294271 http://www.mindat.org/forum.php?read,6,294271,294271#msg-294271 I have photographed mineral in 1:1, but it is no longer sufficient for my needs.
Have found a AmScope SM-1TSZ-144-9m microscope on ebay and want to hear you opinion
on the microscope, and especially the small 9mp camera?
How about quality of the photos? Can you attach a photo shot with that camera?
How about quality of the microscope? Is there any complications if shift over to ex. a nikon camera?

Thanks for advises / Ulf]]> Ulf Nyberg General Sun, 19 May 2013 18:34:00 +0000 http://www.mindat.org/forum.php?read,6,293728,294253#msg-294253 http://www.mindat.org/forum.php?read,6,293728,294253#msg-294253 Rob Woodside General Sun, 19 May 2013 15:44:18 +0000 http://www.mindat.org/forum.php?read,6,293728,294201#msg-294201 http://www.mindat.org/forum.php?read,6,293728,294201#msg-294201 No you don't need to do any thing more. Sounds like you have enough experience to know if it is prehnite or not. Knowing the locality as you do and the geology there are not a lot of other things it could be Some prehnites are orange colored either by iron staining or something else in its structure. As for the green/blue balls, I would just put a ? mark after the name on the label and eventually you might find some other ones that you could sacrifice for testing. There is a lot of stuff like that in my collection that I may get around to testing some day or not.]]> Rock Currier General Sat, 18 May 2013 19:57:14 +0000 http://www.mindat.org/forum.php?read,6,294057,294188#msg-294188 http://www.mindat.org/forum.php?read,6,294057,294188#msg-294188
They also occur in Namibia: See this link,

I would guess they were widespread during the Paleoproterozoic in proto-North America, but are poorly exposed between Minnesota and Montana due to all the younger cover sequences.]]> Keith Wood General Sat, 18 May 2013 15:41:04 +0000 http://www.mindat.org/forum.php?read,6,292284,294181#msg-294181 http://www.mindat.org/forum.php?read,6,292284,294181#msg-294181
Jade and Serpentine Comparison:
[attachment 45497 JadeandSerpentine.jpg]

Nephrite and Jadeite:
[attachment 45498 014.JPG]

Just About Everything - Jade, Jasper, Jaspagate, Hornblende, Serpentine, Quartz mixture and Unidentified:
[attachment 45500 G01.JPG]]]> Kathy Dean (2) General Sat, 18 May 2013 15:03:31 +0000 http://www.mindat.org/forum.php?read,6,294057,294177#msg-294177 http://www.mindat.org/forum.php?read,6,294057,294177#msg-294177 [attachment 45496 DSCN2474.JPG]]]> Bill Cordua General Sat, 18 May 2013 13:56:09 +0000