Discussion in 'Prospecting & Detecting' started by VANGBAC, Mar 6, 2015.
Can any of you detecting guys/ gals give a rundown on contents of this lump? thank you.
Gold IMHO with plenty of quartz which is very common,because the 2 are often found together.
I am very sure that there is a good formula to work out the weight of the gold but I do not know it
Very very nice
Good door stopper - where do you live
P.S. I could be wrong,but I will never admit it :lol:
We need a "tagging" capability on SS.
Quartz definitely, no gold, pyrite? blue stuff (Some copper compound??)
Where did it come from?
Ok this'll be a stretch.
Quartz with chalcopyrite.
It'll be Chalcopyrite which can have those brassy pink, gold, blue & green metallic species... it can be just a function of how the cyrstals grew.
HOwever that patch of dull dark blue/ green mineral has attracted my attention. Have you got a clearer pic ?
Here's a stock pic of some chalcopyrite... I think the black matte coloured stuff (in VANBAC's pic) is an iron oxide, although Chacopyrite can also take this form.
I'll guess that it might be later stage authogenic Goethite, whichcan take on a metallic tinge... however this would have to be confirmed with the presence of come radiating crystals.
Goethite note radiating crystal structure in this 'specimen quality' sample
Thanks all this came from another Forum. Have asked PMd him to go to this page and read the answers. Hopefully if he does clawhammer will get a close up if not I will ask him for one.
The 'black' stuff may be Tenorite... but that mineral is more typical of deep copper sulphide deposits that have been weathered. The 'fresh' nature of the chalcopyrite, together with the absence of Cyrosocolla, Azurite and Malachite which are typically associated with Tenorite support my original guess.
Have asked him to come over and look he says thanks and will so maybe be able to find out location and more. interesting looking piece. If he needs a close up and cannot do I will get and upload for a closer look.
here is a close up of the rock !
and another http://prntscr.com/6drhl6
i dont know how to add the pic in this post :/
Heres a few CH if you could give any more info thanks mate.
Its all chalcopyrite (apart from the quartz).
The dull black/blue is probably a result of the chalcopyrite being 'squeezed' & deformed as evidenced by those pieces of grey coloured 'country rock' that are striated and polished.
Whenever you get what I like to call the "petroleum spill" look on a specimen rock host, and it carries any form of sliverish, copperish or gold hue..... It is Always a Pyrite pyritemix.
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