Any Geologists or Stone experts here?

Submitted: Monday, Nov 09, 2020 at 10:30
ThreadID: 140731 Views:1582 Replies:6 FollowUps:9
During my east of Burra drive on Friday, I found this very unusual stone that caught my eye.

The stone has the appearance of an old wrinkled prune, with its unusual wrinkled texture.

If you are a geologist or Stone expert, are you able to shed any light what it is?

Thanks and no smart arse remarks.
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Reply By: GerryG - Monday, Nov 09, 2020 at 10:38

Monday, Nov 09, 2020 at 10:38
Looks like a river worn piece of Ironstone. Is it heavy for its size?
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Follow Up By: Stephen L (Clare) SA - Monday, Nov 09, 2020 at 10:48

Monday, Nov 09, 2020 at 10:48
Yes Gerry, it is heavy, but usually river worn stone are quite smooth, but the ridges in the stone are quit distinguishing
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Reply By: Allan B (Sunshine Coast) - Monday, Nov 09, 2020 at 11:08

Monday, Nov 09, 2020 at 11:08
.
I'd get rid of it quick Stephen.
Going by your photos it's growing bigger by the minute.
Is it making any strange sounds?
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Follow Up By: Stephen L (Clare) SA - Monday, Nov 09, 2020 at 11:16

Monday, Nov 09, 2020 at 11:16
Only a tick, tick, tick.....ha ha
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Follow Up By: Gramps - Monday, Nov 09, 2020 at 11:17

Monday, Nov 09, 2020 at 11:17
Obviously a dragon hatching. It needs fire.

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Follow Up By: Member - nickb "boab" - Monday, Nov 09, 2020 at 16:29

Monday, Nov 09, 2020 at 16:29
never any shortage of EXPERTS here on the forum Stephen : )))
looks like a fossilised guinea pig turd ...
Cheers Nick b
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Reply By: Member - Warren H - Monday, Nov 09, 2020 at 11:19

Monday, Nov 09, 2020 at 11:19
I'm not a geologist but have hung around with a few on field trips, perhaps extra info might help identification, such as the location of find and in what setting e.g. plain, hillslope, water course/drainage line, is it consistent with other rocks in the area (apart from shape), hardness, specific gravity (already mentioned), attracted to a magnet (thinking meteorite)? The polished but not completely rounded surface is interesting. You can get polishing by wind blown grit, I think it's called desert varnish. Edit Desert varnish
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Follow Up By: Stephen L (Clare) SA - Monday, Nov 09, 2020 at 11:39

Monday, Nov 09, 2020 at 11:39
Hi Warren

It was in flat open pastoral country near some bluebush. It is not located anywhere near a creek or watercourse.

Northeast of Burra outside of Goyders Line of Rainfall
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Follow Up By: Member - Warren H - Tuesday, Nov 10, 2020 at 10:59

Tuesday, Nov 10, 2020 at 10:59
Having a better look on the computer rather than phone screen the probable iron/manganese oxide is a coating . It's also on all sides so probably formed when buried, not on the surface. When looking at these sort of things, the questions that earth scientists ask is whether what they are observing is the result of a contemporary or relict process. These coatings form as the result of alternate weting and drying cycles, wet to reduce and mobilise the iron, dry to precipitate and form the coating. The uneven nature of the coating is interesting. As I wrote I only associated with the geologists/soil scientists. I can explain what happens once the chemistry kicks in, but only learnt enough to put this in context with the other landscape processes. Swamps I'm the full bottle, but in the arid zone I'm a tourist.
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Follow Up By: Kazza055 - Wednesday, Nov 11, 2020 at 13:22

Wednesday, Nov 11, 2020 at 13:22
Looks to me like a fossilised turd ;=))
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Follow Up By: Member - Warren H - Wednesday, Nov 11, 2020 at 14:07

Wednesday, Nov 11, 2020 at 14:07
"Looks to me like a fossilised turd ;=))"
That would be a coprolite, those palentologists have a name for everything ; )
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Reply By: Member - OzJourney - Monday, Nov 09, 2020 at 11:36

Monday, Nov 09, 2020 at 11:36
If it was the only rock like that around and it’s magnetic I’d guess a meteorite, but I am certainly no expert but I always keep a bit of an eye out for them.
AnswerID: 634050

Reply By: GarryR - Monday, Nov 09, 2020 at 14:58

Monday, Nov 09, 2020 at 14:58
Hi Stephen, when all else fails and you have a bit of spare time, you may be able to contact someone at Adelaide University Geological Dept for a verification of the rock. A chap that I know, and his son (Melb Uni) are both geologists and work around the world. They always have these sort of queries placed on them, and are more than willing to help. May be your local University will do the same.
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Follow Up By: Stephen L (Clare) SA - Monday, Nov 09, 2020 at 15:28

Monday, Nov 09, 2020 at 15:28
Hi Garry

I have sent off photos to the Museum in Adelaide, so it will be interesting to see what they have to say.
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Reply By: axle - Tuesday, Nov 10, 2020 at 08:25

Tuesday, Nov 10, 2020 at 08:25
G/ Day Stephen, looks like you didn't have enough heat on one side with your chocolate cake mix!..lol


Cheers Axle.
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