Mineral identification

Reply Tue 7 Jun, 2016 06:21 pm
So I found a large lump of Quartz in Ireland with some interesting minerals embedded I it.

I think it might be various coloured types of pyrite.

Can anyone confirm if they are such from the photos?





Reply Tue 7 Jun, 2016 06:23 pm
Looks like Peacock Pyrite to me.
Reply Tue 7 Jun, 2016 06:29 pm
Thanks - checked that up on wiki and it would make sense as the rock is from near an old copper mine.
Reply Tue 7 Jun, 2016 08:20 pm
yeh, most of the blue is Bornite (or as ros called it, by its better known name of called peacock ore). The goldish looking pyrite is chalcocite or chalcopyrite and the layers look like a copper tin sulfide called stannite or maucherite.(Cant tell without doing a closer look).
If you have lots of it to spare, put each different colored specimen onto a piece of ceramic (unglazed) . Using a hand blowtorch, hit it with the blue part of the blowtorch flame for a few seconds in a darkened area (ppreferably outside on a concrete or bricked area. If there is a lingering bluish flame of sulfur present, youve got the entiremetal sulfide family there, copper, Iron, manganese, tin ,zincand nickle. Pyrites are a huge group of sulfide minerals and we classify them by their metal ion and the number of sulfur atoms per molecule(or elements that "Act" like sulfur like tellurium, selenium or sulfoxides)
, like AX are minerals where theres an EQUAL number of metal ions to an equal number of sulfur ions (like Galena (PbS) or Chalcopyrite Cu2Fe2-S4
or AX2 are minerals with one metal and two sulfurs (like iron pyrite Fe S2), Theres about 165 separate minerals and the class is growing almost monthly as we explore deeper magamatic zones.

Pyrites are always important metal holders where very desirable metals actually occupy spaces in the pyrite xl lattice. two of the biggest gold mines in the US were not in the west or alaska (until recentlynwhen tehse mines were closed).
The biggest gold mines were in the piedmont of the Appalachins (Pq and South Carolina)
The neat thing is that the Grampian highlands and other areas in the UK are "connected by birth" to these US piedmont "pyrite gold rocks"

One mine in Pa, used to produce 23 weight of gold that was a bit greater than 12 oz per ton of ore. All from pyrite crystals. I really dont know why the name "fools Gold" stuck, becuse as our metallurgy and processing tricks improved, we were able to get the gold from pyrites quite easily. "fools gold " is a term that goes back to pacer days when they didnt know that the pyrite was also worth going after, except that they didnt really have the extraction and purification tricks that we do.

Thered been a few minor "gold rushes " in the UK during the 20th century, most of it metamorphic quartz bearing pyrite or hydro gold in quartzites.

Reply Wed 8 Jun, 2016 09:14 am
Thanks for the extensive info Farmerman.

I'd like to try that blowtorch experiment but I don't think I could. I can't really manage to break any of the Quartz block off so my chances of isolating any piece of the pyrite are very slim.
Reply Wed 8 Jun, 2016 09:17 am
then you can use a "streak test" with another piece of flat un glazed porcelain (Underneath of a pice of Rockingham pottery would work)
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Reply Wed 8 Jun, 2016 10:37 am
Miki, #3, 4, 5 remind me of mica; that is, unless #5 is gold, which I doubt. Need help with 1 and 2, I'd like to know too, beautiful
Reply Wed 8 Jun, 2016 10:42 am
pyrite is like saying "meat".

0 Replies

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