I found this recently while excavating an as yet unknown gravel bed i descovered a year ago in my local area, i think it may be native silver in quartz any help would be very welcome. http://www.mindat.org/forum.php?read,11,259819,259819#msg-259819 Wed, 22 May 2013 00:14:46 +0000 Phorum 5.2.15a http://www.mindat.org/forum.php?read,11,259819,263784#msg-263784 http://www.mindat.org/forum.php?read,11,259819,263784#msg-263784 Heath Barnes Identity Help Fri, 15 Jun 2012 22:03:58 +0000 http://www.mindat.org/forum.php?read,11,259819,263051#msg-263051 http://www.mindat.org/forum.php?read,11,259819,263051#msg-263051 Heath Barnes Identity Help Fri, 08 Jun 2012 23:11:07 +0000 http://www.mindat.org/forum.php?read,11,259819,260849#msg-260849 http://www.mindat.org/forum.php?read,11,259819,260849#msg-260849 -------------------------------------------------------
> Did you already check whether it could be
> Molybdänite? Molybdänite occurs often together
> with quartz opposed to native silver. I add a
> picture for comparison.
>
> Uwe Ludwig


Uwe thanks for the help one thing that ive not managed to find is anything simmiler to the way my example apears to be flowing through the quartz?]]> Heath Barnes Identity Help Tue, 15 May 2012 20:32:56 +0000 http://www.mindat.org/forum.php?read,11,259819,260848#msg-260848 http://www.mindat.org/forum.php?read,11,259819,260848#msg-260848 -------------------------------------------------------
> No it can't be scratched with a finger nail
> Amanda, it leaves a grey- silver streak on the
> back of a tile but makes quite a noise doing it.


Appolagies to all it can be scratched with a finger nail i did not look close enough!!!]]> Heath Barnes Identity Help Tue, 15 May 2012 20:14:59 +0000 http://www.mindat.org/forum.php?read,11,259819,260822#msg-260822 http://www.mindat.org/forum.php?read,11,259819,260822#msg-260822
Regards george]]> George Creighton Identity Help Tue, 15 May 2012 14:44:36 +0000 http://www.mindat.org/forum.php?read,11,259819,260804#msg-260804 http://www.mindat.org/forum.php?read,11,259819,260804#msg-260804
google is not the best solution to check minerals. Go to the link: [www.handbookofmineralogy.org].

There you find a complete description of Molybdenite (and of all other minerals).

At the beginning of this thread you wrote about a black soft tarnish. That may be Jordesite which is also a molybdene sulfide.

@George: I found the molybdenite which I showed on the dump of the mine 371. You find the mineral list of this location at Niederschlema, shaft 371. However, this was a relatively rare mineral there.

rgds.
Uwe Ludwig]]> Uwe Ludwig Identity Help Tue, 15 May 2012 11:05:54 +0000 http://www.mindat.org/forum.php?read,11,259819,260762#msg-260762 http://www.mindat.org/forum.php?read,11,259819,260762#msg-260762 Heath Barnes Identity Help Mon, 14 May 2012 21:57:13 +0000 http://www.mindat.org/forum.php?read,11,259819,260759#msg-260759 http://www.mindat.org/forum.php?read,11,259819,260759#msg-260759 Heath Barnes Identity Help Mon, 14 May 2012 21:09:14 +0000 http://www.mindat.org/forum.php?read,11,259819,260758#msg-260758 http://www.mindat.org/forum.php?read,11,259819,260758#msg-260758 www.mindat.org]

Also tend to agree with this suggestion

Regards

Edit,,,, went through all 500+ but could not find the variety/type Uwe alluded too]]> George Creighton Identity Help Mon, 14 May 2012 21:00:25 +0000 http://www.mindat.org/forum.php?read,11,259819,260757#msg-260757 http://www.mindat.org/forum.php?read,11,259819,260757#msg-260757 Heath Barnes Identity Help Mon, 14 May 2012 20:45:29 +0000 http://www.mindat.org/forum.php?read,11,259819,260752#msg-260752 http://www.mindat.org/forum.php?read,11,259819,260752#msg-260752
Uwe Ludwig]]> Uwe Ludwig Identity Help Mon, 14 May 2012 20:30:12 +0000 http://www.mindat.org/forum.php?read,11,259819,260746#msg-260746 http://www.mindat.org/forum.php?read,11,259819,260746#msg-260746 Heath Barnes Identity Help Mon, 14 May 2012 19:50:05 +0000 http://www.mindat.org/forum.php?read,11,259819,260742#msg-260742 http://www.mindat.org/forum.php?read,11,259819,260742#msg-260742 Amanda Hawkins Identity Help Mon, 14 May 2012 18:31:58 +0000 http://www.mindat.org/forum.php?read,11,259819,260611#msg-260611 http://www.mindat.org/forum.php?read,11,259819,260611#msg-260611 Heath Barnes Identity Help Sat, 12 May 2012 21:16:55 +0000 http://www.mindat.org/forum.php?read,11,259819,260607#msg-260607 http://www.mindat.org/forum.php?read,11,259819,260607#msg-260607 Heath Barnes Identity Help Sat, 12 May 2012 20:35:20 +0000 http://www.mindat.org/forum.php?read,11,259819,260601#msg-260601 http://www.mindat.org/forum.php?read,11,259819,260601#msg-260601
Heath, I'm curious about your research in the Cleveland area. What are you researching? Cheers, Becky]]> Becky Coulson Identity Help Sat, 12 May 2012 20:00:34 +0000 http://www.mindat.org/forum.php?read,11,259819,260256#msg-260256 http://www.mindat.org/forum.php?read,11,259819,260256#msg-260256 Heath Barnes Identity Help Tue, 08 May 2012 20:22:11 +0000 http://www.mindat.org/forum.php?read,11,259819,260190#msg-260190 http://www.mindat.org/forum.php?read,11,259819,260190#msg-260190
[www.mindat.org]

Hope this helps.
regards,
stephanie :-)]]> Stephanie Martin Identity Help Tue, 08 May 2012 03:54:42 +0000 http://www.mindat.org/forum.php?read,11,259819,260189#msg-260189 http://www.mindat.org/forum.php?read,11,259819,260189#msg-260189 Try getting a few 'beginner' rock books at a library, and don't be ashamed they are for beginners, this is a deep subject, and get a few, because each will explain things a little different, and each will add to your awareness. I for one, never gave a second thought what is under my feet, and now it is a brave new world, in a good sense. And w/ book in hand, keep mindat on your screen when reading, to compare pictures, posts, etc. Very helpful. Enjoy.]]> D Mike Reinke Identity Help Tue, 08 May 2012 03:16:05 +0000 http://www.mindat.org/forum.php?read,11,259819,260175#msg-260175 http://www.mindat.org/forum.php?read,11,259819,260175#msg-260175 Alfredo Petrov Identity Help Mon, 07 May 2012 23:52:01 +0000 http://www.mindat.org/forum.php?read,11,259819,260172#msg-260172 http://www.mindat.org/forum.php?read,11,259819,260172#msg-260172 Heath Barnes Identity Help Mon, 07 May 2012 22:47:40 +0000 http://www.mindat.org/forum.php?read,11,259819,260162#msg-260162 http://www.mindat.org/forum.php?read,11,259819,260162#msg-260162 Heath Barnes Identity Help Mon, 07 May 2012 21:09:47 +0000 http://www.mindat.org/forum.php?read,11,259819,260157#msg-260157 http://www.mindat.org/forum.php?read,11,259819,260157#msg-260157 Alfredo Petrov Identity Help Mon, 07 May 2012 20:38:11 +0000 http://www.mindat.org/forum.php?read,11,259819,260154#msg-260154 http://www.mindat.org/forum.php?read,11,259819,260154#msg-260154 Heath Barnes Identity Help Mon, 07 May 2012 20:18:00 +0000 http://www.mindat.org/forum.php?read,11,259819,260147#msg-260147 http://www.mindat.org/forum.php?read,11,259819,260147#msg-260147
1070 ml = 1000 cm³

3000 gm / 1000 cm³ = 3 gm /cm³

So specific gravity = density of substance / density of water = (3 gm/cm³) / (1 gm/cm³) = 3

So roughly (to 1 significant figure) the specific gravity of your "Ag" is 3. That is too low for a rock that is half Silver as Mike says.]]> Rob Woodside Identity Help Mon, 07 May 2012 19:31:46 +0000 http://www.mindat.org/forum.php?read,11,259819,260145#msg-260145 http://www.mindat.org/forum.php?read,11,259819,260145#msg-260145 -------------------------------------------------------
> Heath,
> You've got the weight, if you can get the volume,
> you can get the specific gravity, SG, which tells
> a lot. SG of silver is @ 10, '10x heavier than
> water', quartz is @2.6. 2.7 is mica. If it is
> half silver, it should feel distinctly heavier
> than a quartz chunk of same size. If you have a
> measuring cup w/ marks on the side, submerge it in
> water, see the amount, remove it and see what is
> left. The diff. is the volume. there is a thread
> on how to get SG here on mindat too. That would
> be even better to consult.
> Either way, this is only a ballpark figure, but if
> you're new, like me, (and underfunded like me!) it
> is a good start. You can only estimate the SG
> since you can't know the exact percentage of
> quartz you have. So if your SG is anywhere near
> 3, assuming it is half quartz, you have no Ag, if
> it is around 6, you may have half silver, half
> quartz. Or another heavy mineral is in there.
> Make sense??! Hope this helps!


Mike i hope ive done this right if so the volume is 1070 ml so now how do i get the sg ?]]> Heath Barnes Identity Help Mon, 07 May 2012 19:09:35 +0000 http://www.mindat.org/forum.php?read,11,259819,260143#msg-260143 http://www.mindat.org/forum.php?read,11,259819,260143#msg-260143 Heath Barnes Identity Help Mon, 07 May 2012 18:58:46 +0000 http://www.mindat.org/forum.php?read,11,259819,260130#msg-260130 http://www.mindat.org/forum.php?read,11,259819,260130#msg-260130 -------------------------------------------------------
> Thanks for the new pictures. It is definately not
> Silver. Perhaps an amphibole? What is its
> hardness?
>
> Claire, why do think this is not flint?
> [www.mindat.org]
> ,filename=DV000061-001.JPG
> Heath says the purported silver does not produce
> micaceous flakes, I agree with you that it does
> look like some kind of mica..

Apologies for not getting back sooner, I am on night rotation for a few days. My reason for not thinking it was flint or chalk is because having seen the flint and chalk beds of the South Downs (GB), and also having some back at home, this peice does not look like it. However, I do not mind being proved wrong... The crystaline peice on the top appears white and looks like it has definate clevage lines, flint and chalk appear not to have these and are only cystaline under microscope. However, I do think it is an interesting conundrum.... Hope this helps!]]> claire Brimson Identity Help Mon, 07 May 2012 17:15:51 +0000 http://www.mindat.org/forum.php?read,11,259819,260107#msg-260107 http://www.mindat.org/forum.php?read,11,259819,260107#msg-260107 Heath Barnes Identity Help Mon, 07 May 2012 11:48:32 +0000 http://www.mindat.org/forum.php?read,11,259819,260106#msg-260106 http://www.mindat.org/forum.php?read,11,259819,260106#msg-260106 -------------------------------------------------------
> Those last two photos remind me of Trinitite.
Jim its the first ive heard of Trinitite, its all new to me but after reading up on it and viewing images i see what you mean, at first i thought it must be Flurite but then realised its far to hard it scratches steel very easily aswell as glass, it was dug from a previously unknown gravel bed i descovered while excavating in my local area. The beds are at least 15.000 years old, could the near by Cleveland dyke event have caused a simmiler enviroment in the rocks it intruded?]]> Heath Barnes Identity Help Mon, 07 May 2012 11:32:09 +0000