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DPS Ammonite

Horn Coral with?

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DPS Ammonite

What is the net like pattern that sticks-out on the inside and outside of a silicified Pennsylvanian horn coral from NW of Payson, Arizona? Could it be an epibont-sponge? Could it be silica that filled cracks in part of the coral that was not silicified and eroded away? The coral opening is about 2.5 inches across.

P1020515 (1280x1168).jpg

P1020516 (1280x769).jpg

P1020517 (1280x920).jpg

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WhodamanHD

Did somebody say Boxwork! no? How about now?

Edit: which is basically the same thing Tony said I believe.

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doushantuo

It's a phreatic calcite mosaic that extended into void-filling cement. 

A not unusual diagenetic product ,particularly in Pleistocene corals from the tropics

Vide supra:P

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Arizona Chris

Looks like a calcedony extrusion from the surface of a naco rugose.

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DPS Ammonite

Thank you everyone and Occam. The simplest answer is the best one.

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ynot
On 12/31/2017 at 7:22 PM, WhodamanHD said:

Did somebody say Boxwork! no? How about now?

Edit: which is basically the same thing Tony said I believe.

"boxwork" is more of a descriptive term and does apply in this case, but does not necessarily need be made of mineralized cracks.

Often boxwork is created by intergrown tabular crystals.

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bone2stone

Now ain't dat cool.

No input but I admire the specimen anyway.

 

Jess B.

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Ludwigia

So is it calcite or is it chalcedony? A little vinegar would bring certainty.

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DPS Ammonite

Silica. I etched the whole thing out of limestone with HCl.

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