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Field CollectingPocket Indicators - Post Yours
24th Apr 2012 05:32 UTCRobert Simonoff
This got me to wondering about pocket indicators. I have heard about indicators at other locations, but they were quite different. I would record them here, but don't remember the details.
I am wondering if the gathered mindations would be willing to list some localities and what the pocket indicators are for them. If you know WHY these indicators mean a pocket is imminent, that would be great too.
Thanks!
Bob
24th Apr 2012 07:25 UTCHarjo Neutkens Manager
In the Hohe Tauern mts of Austria, indicators for clefts are: A discordant Quartz vein that dips at a sharp angle, if on this spot the surrounding rock is limonite stained, the Quartz vein shows crystallisation and there's green chlorite present, you'll have a chance for a cleft.
In the Swiss granite very often the surrounding rock around a cleft is strongly leached, and coloured by limonite.
In the Belgian Ardennes, red colouration of the soil can point towards a cleft in a Quartz vein. When a vein is hit, the best indicator is the presence of very sticky dark red-brown mud, the ordinary brown mud is no good. The clefts are always filled with this sticky dark red-brown pocket clay. If you've found a cleft, you have to check how the large the boudins of vein are, in order to predict the next likely spot for a cleft.
In the Belgian volcanic rock area (Porphyry) the best indicators are Quartz veins with boudins, where there's a lot of limonite and a lot of dark green chlorite. Also the host rock surrounding a crystallised vein is leached, and quite often a thin layer of chlorite separates a crystallised Quartz vein from the surrounding rock.
24th Apr 2012 08:31 UTCGeorge Eric Stanley Curtis
These often, but not always, contain Zeunerite.
A similar indicator applies at Basset, when searching for Bassetite,look for rocks that are made out of 'contorted' quartz.
I have had some success with these indicators, though they are not 'pocket' indicators.
I am sure that there must be many more indicators of various sorts.
Albite at Wheal Rose is an indicator of anatase.
Etc Etc.
Eric.
24th Apr 2012 15:44 UTCWilliam C. van Laer Expert
In miarolitic granites, such as the Sawtooth Batholith in Idaho, look for grass or plants growing out of what is otherwise solid rock!
25th Apr 2012 09:36 UTCMichel Ambroise
I fully agree with the mica indicator in granit pegmatite.
Specially when they come like a book in between massive quartz and orthoclase.
Just break right inside and you won't be disapointed....
The mix of this three mineral together, mica, quartz, orthoclase is what i am looking for, if albite also show up , i work the place.
My father was a prospector in Madagascar for Uranium during the 60's alway told me that when the orthoclase included mica they look and call this "graphic pegmatite".
This seems to be an other indicator in madagascar for pocket.
An other pocket indicator are aunt, because they make there home in something easy to build.
Don't smile, just try to look for this insects and follow them...
Good luck to all
Michel
25th Apr 2012 14:57 UTCSteve Hardinger 🌟 Expert
30th Apr 2012 00:04 UTCRowan Lytle
in certain areas of CT I look for red clay when trying to locate quartz crystals.
3rd May 2012 13:19 UTCMichael Otto
-------------------------------------------------------
> In Montana's Boulder batholith, some of the pocket
> "indicators" include: strong graphic granite
> zones; shattered or heavily fractured wallrock;
> corroded or etched feldspar (microcline); late
> minerals such as epidote "sprays" or amethystine
> quartz; local sericitic alteration; sunken areas
> along otherwise obvious pegmatite/aplite outcrops.
> Any euhedral or clearly crystalline debris in the
> float is a strong indication of a pocket nearby.
>
> In miarolitic granites, such as the Sawtooth
> Batholith in Idaho, look for grass or plants
> growing out of what is otherwise solid rock!
This reference to plants growing out of rock brought to mind a time when I was digging down at the base of a quarry wall following a narrow pegmatite vein of coarse material looking for a pocket. Three feet above where I was digging was a Mountain Laurel bush that had a two inch diameter root traveling down the wall which disappeared into a small opening in the vein which easily opened up into a 4 foot by 2 foot pocket. Very exciting and produced many large crystals.
3rd May 2012 15:47 UTCByron Thomas
Byron
3rd May 2012 17:59 UTCBob Harman
8th May 2012 02:37 UTCPaul Brandes 🌟 Manager
14th May 2012 03:48 UTCMark & Linda Mahlum
23rd May 2012 00:32 UTCBob Jackson 🌟 Expert
8th Jun 2012 06:01 UTCRon Layton
8th Jun 2012 08:56 UTCJesse Fisher Expert
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Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: March 28, 2024 21:01:42