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hndmarshall

what is this looks like fancy poo

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hndmarshall

this is interesting fancy poo or a plant?..crystal or what?

42277927_2163404063671758_5906994394795343872_n.jpg

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42335328_2163411470337684_2273518892070469632_n.jpg

42335359_2163409653671199_5994090967144071168_n.jpg

42411164_2163417420337089_341341434927906816_n.jpg

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Bobby Rico

“Fancy Poo”  that is the first time I have heard them words combined. :D

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Wolf89

You should mention where it was found

 

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hndmarshall
5 minutes ago, Wolf89 said:

You should mention where it was found

 

I dont really know location unknown my friend picked it up in a box of rocks at a garage sale

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GeschWhat

Not fancy poo...:(

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FranzBernhard

No, not poo at all. It has some similarities of a sandstone concretion (as already pointed out) but also some similarities of a worn desert rose (both are technically speaking not so different). I think a worn ikaite-pseudomorph is not a possibility.

Franz Bernhard

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hndmarshall
45 minutes ago, Auspex said:

I think it may be a sandstone concretion.
They can be pretty amazing:

~~.jpg

Yours has a bilateral symmetry tendency, which would be a characteristic that might narrow down the type of accreting mineral involved.

I do believe you are correct! look what i found... it says calcite.

Calcite sand crystal take 1_large.JPG

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fossilnut

@hindmarshall has nailed it. Calcite crystals replaced with sand but retaining the crystal form. Nice in there own "gritty" way. @Auspex's sandstone concretion is really cool too. Poo on the original idea.

The calcite crystals (dog tooth spar) precipitate out of ground water and cement the loose quartz sand grains into the crystal's lattice structure. An evaporate. Occurrences in South Dakota are mentioned.

Edited by fossilnut
add some info

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Ludwigia

A cool and relatively uncommon sample at any rate.

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abyssunder

Pretty nice! :)
They are called "sand calcite". Take a look here .

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DPS Ammonite
6 minutes ago, fossilnut said:

@hindmarshall has nailed it. Calcite crystals replaced with sand but retaining the crystal form. Nice in there own "gritty" way. Auspex's sandstone concretion is really cool too. Poo on the original idea.

The calcite has grown in sand forming crystals. The crystals contain inclusions of sand. The sand has not replaced the crysyals.

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abyssunder

What John said is correct. For more details you can check this document. :)

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Darktooth

Fancy Poo? I think we have a new term of endearment for @GeschWhat

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FranzBernhard

Already something learned today! Thanks to all!
Franz Bernhard

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