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#1

Puma
Newbie
Joined: 09 July 2017
Posts: 7
Newbie
07 August 2017 11:08 am

Hi any help is appreciated. Picked up some quartz and broke it up to find this. Anyone tell me what it may be.1502064437_img_4102.jpg
1502064439_img_4103.jpg

#2

jethro
Member
From: North East , VIC
Joined: 06 September 2013
Posts: 462
Member
07 August 2017 08:41 pm

I think you have a pyrite decomposition product called limonite, but I am not a geologist, so am happy to be corrected by those more suitably qualified.

#3

Puma
Newbie
Joined: 09 July 2017
Posts: 7
Newbie
08 August 2017 09:17 am

Thanks Jethro I will look up on google for a definition.

#4

Puma
Newbie
Joined: 09 July 2017
Posts: 7
Newbie
10 August 2017 01:10 pm

Thank you to all the members of this great forum who have had the time to view my post. You feedback has been great help. I promise to make a recommendation to all the other newbie prospectors i come across to join this forum they are sure to receive an abundance of advise . Thank you. neutral

#5

jethro
Member
From: North East , VIC
Joined: 06 September 2013
Posts: 462
Member
10 August 2017 01:49 pm

Hey Puma, Dont loose heart mate. There is not a great deal of knowledge on the forum regarding mineral ID. There are a few Geos that check in occasionally but the majority on here are mainly interested with sluicing and detecting which is fine as it leaves more gold in the rocks for me and you.
Look up minerals here http://webmineral.com/ has a lot of different perameters you can search by; thumbsup

#6

20xwater
Member
From: Bathurst, NSW
Joined: 05 March 2014
Posts: 885
Member
10 August 2017 09:39 pm

jethro wrote:

I think you have a pyrite decomposition product called limonite, but I am not a geologist, so am happy to be corrected by those more suitably qualified.

1502361741_feldspar.jpg

feldspar?

Last edited by 20xwater (10 August 2017 09:42 pm)

#7

goldierocks
Member
Joined: 10 January 2015
Posts: 860
Member
09 January 2018 01:45 pm

I doubt that it is solid limonite (could be a surface film). Two most likely are ankerite and feldspar (scratch it - ankerite is a carbonate and much softer than feldspar which is a silicate, ankerite will fizz with hydrochloric acid but feldspar will not). Ankerite is actually white inside, so try crumbling a few pieces or digging at the surface with a pocket-knife blade point - with feldspar the colour goes right through it. Ankerite is a carbonate mineral with a small iron content, and it also has very good planar cleavage planes (feldspar also has good cleavage planes). However near the ground surface water penetrates the cleavage planes, and in the case of ankerite it slightly oxidises the iron in the mineral to form a very thin yellowish-brown film on the cleavage plane surfaces, Feldspar has no iron in it so does not do this. Hope that helps - ankerite is the most common carbonate mineral in Victorian quartz veins - feldspar does occur in the veins but is far rarer than carbonate minerals.

Leave it for you Jethro - in your dreams mate! Not lack of interest but easier to make a good steady living on pay for a geo than detecting (but many do, especially in mining slumps).


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

#8

Hunting the yellow
Member
From: down a hole
Joined: 20 December 2012
Posts: 1,710
Member
09 January 2018 08:00 pm

clay in-between the quartz crystals


born 150 years too late and missed all the gold rushers

#9

Hunting the yellow
Member
From: down a hole
Joined: 20 December 2012
Posts: 1,710
Member
09 January 2018 08:00 pm

20xwater wrote:
jethro wrote:

I think you have a pyrite decomposition product called limonite, but I am not a geologist, so am happy to be corrected by those more suitably qualified.

https://www.prospectingaustralia.com.au … ldspar.jpg

feldspar?

quartz reef mate in what looks like either shale or slate.


born 150 years too late and missed all the gold rushers


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