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Mine Exploration Forum

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Author Anyone know what this is?
carnkie

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Joined: 07/09/2007
Location: camborne, cornwall

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Anyone know what this is?
Posted: 21/08/2012 19:40:37
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This question was asked on another forum. Apparently it was dug up by a potato harvester.



(click image to open full size image in new window)



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blackshiver

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Joined: 08/06/2008
Location: Teesside

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Anyone know what this is?
Posted: 21/08/2012 19:51:10
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http://en.wikipedia.org/wiki/Carnelian

Possibly.
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Boy Engineer

Joined: 20/06/2008
Location: Derby

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Anyone know what this is?
Posted: 21/08/2012 19:58:31
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Apparently it was dug up by a potato harvester.
Is it a potato? They sell red potatoes at our local Morrisons that look a bit like that and they take some boiling. Wink
IP: 2.24.122.45
lipsi

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Joined: 20/04/2008
Location: Worcester, England

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Anyone know what this is?
Posted: 21/08/2012 21:16:00
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Looks like a pretty nice piece of carnelian to me (red agate) If so, should have a hardness of 7 (same as quartz) Where was it found?
Carnelian is found at Wheal Cock and Marazion in Cornwall

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Where there's a mine or a hole in the ground. That's where I'm heading for that's where I'm bound So follow me down Cousin Jack (Grateful thanks to Show of Hands)
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John Lawson

Joined: 09/12/2010
Location: Castle Douglas Dumfries & Galloway

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Anyone know what this is?
Posted: 21/08/2012 22:18:03
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Almost certainly this a sample of red Jasper.
It it is found from Cornwall to Shetland.
Carnellan is orange, more translucent and of course rarer.
Agates usually are banded this is not.
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carnkie

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Anyone know what this is?
Posted: 21/08/2012 22:24:38
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lipsi wrote:

Looks like a pretty nice piece of carnelian to me (red agate) If so, should have a hardness of 7 (same as quartz) Where was it found?
Carnelian is found at Wheal Cock and Marazion in Cornwall


It was found in Shropshire.

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Roy Morton

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Joined: 09/10/2007
Location: Redruth Cornwall

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Anyone know what this is?
Posted: 21/08/2012 23:28:40
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It was found in Shropshire.

Shropshite ? Innocent Laugh

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'Bid me discourse, I will enchant thine ear' IP: 86.178.17.182 Edited: 21/08/2012 23:29:06 by Roy Morton
Roy Morton

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Joined: 09/10/2007
Location: Redruth Cornwall

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Anyone know what this is?
Posted: 21/08/2012 23:34:18
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Looks like Hematite....Any idea of size / weight / Spg. grav?
Hematite is fairly heavy and dense, and the colour, as far as this photo shows, is about right too.

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lozz

Joined: 03/08/2012
Location: Cornwall

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Anyone know what this is?
Posted: 21/08/2012 23:44:16
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Could have come down during the last Ice Age.

Lozz.
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somersetminer

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Joined: 19/05/2012
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Anyone know what this is?
Posted: 22/08/2012 00:48:58
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Dont think Hamatite, this looks to have a bit of a polish like its got a high hardness, sort of gemmy look to it. Easy to tell that anyway nick it with a grinder... IP: 90.217.81.219
rufenig

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Joined: 18/03/2008
Location: Shropshire Hills

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Anyone know what this is?
Posted: 22/08/2012 08:11:08
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Looks VERY like red Jasper from the Lleyn (North Wales)

"Found in Shropshire"
You didn't find it on my wall did you ! Shocked
I will be checking! Smartass
IP: 91.125.186.251
carnkie

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Joined: 07/09/2007
Location: camborne, cornwall

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Anyone know what this is?
Posted: 22/08/2012 09:05:20
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A look from a different angle.

[web link]


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Minegeo

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Joined: 17/06/2008
Location: Ireland

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Anyone know what this is?
Posted: 22/08/2012 14:33:10
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Looks like jasperoidal silica. Basically chalcedonic quartz with micro-inclusions of iron oxides (both haematite and other gel oxides). IP: 92.251.220.250
carnkie

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Joined: 07/09/2007
Location: camborne, cornwall

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Anyone know what this is?
Posted: 22/08/2012 15:51:20
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Minegeo wrote:

Looks like jasperoidal silica. Basically chalcedonic quartz with micro-inclusions of iron oxides (both haematite and other gel oxides).


Thanks for that, very helpful, and to everyone else who replied. The chap did send a photo to the NHM. Their reply:

The NHM has got back to me and suggests it looks like Jasper or glass cullet chunk - I really don't think its glass cullet since I have seen that before. Either way the guy said both are not usually found in Shropshire so would have transported here by man or nature. He said there isn't many minerals with such a deep red colour.

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exspelio

Joined: 02/05/2012
Location: peak district

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Anyone know what this is?
Posted: 22/08/2012 17:10:03
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It reminds me of stuff we used to get out of burn't out pit tips, not only red shale, but sometimes harder rocks where caught up in the intense heat, did it come from close by a reclaimed colliery? Or even a foundary?)

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carnkie

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Location: camborne, cornwall

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Anyone know what this is?
Posted: 22/08/2012 17:13:50
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exspelio wrote:

It reminds me of stuff we used to get out of burn't out pit tips, not only red shale, but sometimes harder rocks where caught up in the intense heat, did it come from close by a reclaimed colliery? Or even a foundary?)


I don't really know but it was around Worfied if that's any help.

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Coggy

Joined: 27/12/2008
Location: Birmingham

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Anyone know what this is?
Posted: 23/08/2012 08:54:16
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Some sort of rock. IP: 80.169.48.182
Imageo

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Joined: 03/05/2009
Location: Brisbane, Queensland, Australia

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Anyone know what this is?
Posted: 23/08/2012 13:22:19
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I'll go with Rufenig and John Lawson on this one - jasper. Loks too vitreous to be hematite. Maybe pushed around during the ice ages ?
Cheers

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Minegeo

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Joined: 17/06/2008
Location: Ireland

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Anyone know what this is?
Posted: 23/08/2012 13:46:00
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It is jasperoid NOT jasper. Jasper would be opaque and have a different texture. Both are chalcedonic gel silicas but this sample is definitely jasperoidal silica.

Definitely NOT haematite.
IP: 31.200.188.250 Edited: 23/08/2012 13:47:28 by Minegeo
BertyBasset

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Joined: 13/12/2007
Location: Caernarfon, North Wales

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Anyone know what this is?
Posted: 18/07/2016 00:55:13
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Been to Mynydd Carreg today. Strange mists coming in from the SW. Thought the quarry was at the top of the hill, guarded by bullocks, spent a lot of time exploring outcrops with vague purple bits. The quarry itself is actually quite low down, and has huge chunks of jasper. Very nice. I notice jasper isnt a registered mineral on AN?

Followed up with a trip to Nant Ysgo to pickup 'manganese minerals' which turned out to be black bits of rock, presumably with manganese in it.
IP: 81.153.94.32
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