Rock type?

View previous topic View next topic Go down

Rock type?

Post  petere on Fri Apr 28, 2017 1:29 pm

Can any one tell me what this is. Apparently comes from the Maryborough area.
Mate of mine has them in his garden as a ground cover feature.
The pebbles are around 20-30mm and most of them seem to have this bronzy piece in them.

avatar
petere
Contributor
Contributor

Number of posts : 23
Registration date : 2013-05-24

http://www.metaldetectors101.com

Back to top Go down

Re: Rock type?

Post  AK47 on Fri Apr 28, 2017 4:40 pm

Hi,

The rock looks like slate or a finely bedded stone (claystone / siltstone). The dark colour would suggest that it's not weathered and has come from a mullock heap from an old mine (?). The bronzy crystal looks like pyrite or something similar.

If you want to find out if it is, hit the bronzy thingy with a rock. If it produces a pongy smell (H2S - hydrogen sulphide), then it's pyrite or similar.

Above is just a guess!

Andrew
AK47

AK47
New Poster
New Poster

Number of posts : 12
Registration date : 2017-02-07

Back to top Go down

Re: Rock type?

Post  petere on Fri Apr 28, 2017 5:48 pm

Broke the bronzy coloured bit open couldn't smell anything but it is a shiny silvery colour inside.
avatar
petere
Contributor
Contributor

Number of posts : 23
Registration date : 2013-05-24

http://www.metaldetectors101.com

Back to top Go down

Re: Rock type?

Post  Tributer on Fri Apr 28, 2017 7:51 pm

Not sure what the rock is petere but I have seen similar shaley/coal/sedimentary rocks which contain a bleb of iron pyrite in the middle. The pyrite was actually some form of organic fossil that had been pyritized. Around the pyrite the rock often case hardens a little. Your rock could be a shale with pyrite blebs in it that are seeded around some organic inclusions.....just guessing from the one image.
avatar
Tributer
Management

Number of posts : 994
Registration date : 2008-10-27

Back to top Go down

Re: Rock type?

Post  gef50 on Fri Apr 28, 2017 9:20 pm

Cretaceous clay type ... just a guess
avatar
gef50
Contributor Plus
Contributor Plus

Number of posts : 266
Registration date : 2008-10-24

http://www.vkteksolutions.com

Back to top Go down

Re: Rock type?

Post  petere on Sat Apr 29, 2017 8:15 pm

Thanks for your input guys, gives me something to work on for further research.
avatar
petere
Contributor
Contributor

Number of posts : 23
Registration date : 2013-05-24

http://www.metaldetectors101.com

Back to top Go down

Re: Rock type?

Post  Tributer on Sat Apr 29, 2017 9:18 pm

Petere, the brown dots on the outside of your rock are probably iron pyrite specs that have oxidized and are now the mineral limonite.
avatar
Tributer
Management

Number of posts : 994
Registration date : 2008-10-27

Back to top Go down

Re: Rock type?

Post  Nightjar on Sat Apr 29, 2017 10:48 pm

My guess it is a piece of Nickel which in one form or another has a bronze like appearance.








avatar
Nightjar
Contributor Plus
Contributor Plus

Number of posts : 1999
Registration date : 2008-10-25

http://s4.zetaboards.com/Gold_Detecting/index/

Back to top Go down

Re: Rock type?

Post  Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum