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It could be but It also looks a lot like the mushroom rhyolite that I have dug. I searched online but could not find a good picture of the unbroken outside. If you can cut it open you will be better able to identify it. 

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The layering seen here would rule out coprolite. I’d guess you’ve got some calcite there. It’s very difficult to ID minerals from photos alone, so I can’t be certain.

52908912-8D58-43E9-A23B-064CC8089C9C.jpeg

Edited by d_day
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On 6/20/2020 at 12:54 AM, TheRealOutis said:

What is this rock? Fossil? Coprolite?

Found in SW utah.

any info is appreciated!

 

79_obOhvYbfJtoEIEEiq0XJAl76NSEio7159sKHzb-gd7pKD3kh3Loc430Y6AdCc-vMOu9dVjTGOECE8UEX5vy3f4SqbB0im_wkYfBdXvAtgquaxWVugrsVICdcGLPYbmr8GTeBkJYOdOmnZCDRqdSbMFm90KNS367hhXkyPfc6Gq_DjLmwJwr_iP2FLr6LReLABkSXq3_vSB16qOpi9HloFlkC-LAHGQVokzI_DXyi4S91thOrBxtQgVowzmM5ggCI8B1ZrlBcmWflqT-tPopJHBsCPNN87DDjjGIquEmF9cQpehf_pOuelKAqflDT7l2xibcKEvUTiEgq6wj5BC5_Vi-MbjYjRCGxmGt_lj0CEd36ftS4IbNOAPiS1Kpt473frlGAxV_ojgBZLyqenVCtPeIdAUn5pYYLD3p66kXBtuF_SgOOHEH_uyCsG7AslzHDQ_UxzFH4VYnV_xvxJzZCpj0XrWmoMfOBU08un8_IhcD04tJCNHikbp6JxDGHUx5x2jQtge-LsrFnPe9I7n-x7pPwC-TQiO2wxrae92McAj2p0wZbQ-rE_KP2gwsKVV8WyS7V8iv-SIpVVS_ERyd1-IasOWbEDpNRNKc087SRFpdc_gbjTafWQ07mRvDIwt30WAyKJ57n7xjIT5D2gl2sqMO-iqDB0L-wHZwXJ

My very first impression was a stromatolite. Just not sure though.

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8 minutes ago, Morlock said:

My very first impression was a stromatolite. Just not sure though.

That was my first thought as well. 

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I'm with Haderly on this one.  It's a Lapillistone, a volcanic rock made up of rounded,  pebble sized, lava blobs called lapilli.  It does look like any Stromatolites I have observed.  Lapillistones can be very pretty once cut and polished.  Nice find!

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