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Fossilized corals???


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8 hours ago, d_day said:

Looks like travertine to me.

Yes, may be is some kind of sedimentary rock formation but is not soft like travertine . Is hard , scratch very easy the glass.

Looks like silica rock , maybe is not a coral  or sponge but i believe is something similar to them.

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7 hours ago, ivigo said:

...scratch very easy the glass.

Looks like silica rock , maybe is not a coral  or sponge but i believe is something similar to them.

I think it is coral or sponge fossil.

A sedimentary rock would not be porous like that.

Pumice would not scratch glass or have those straight lines. Only a harder mineral or rock could do that.

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6 hours ago, Stillweaver hillbelli said:

I think it is coral or sponge fossil.

A sedimentary rock would not be porous like that.

Pumice would not scratch glass or have those straight lines. Only a harder mineral or rock could do that.

Sedimentary rocks can be quite porous, particularly those whose deposition is from evaporation, like travertine.

018E3350-0F98-442C-95A0-B2AC4B1D57B1.jpeg

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To me it looks like a volcanic pumice, except the rock itself seems to be more of quarts.  I wonder if it formed kind of like a geode in a bubble in volcanic rock with minerals leaking in and the softer volcanic rock eroded away and left that.

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Its not fossil corals but Quartz Boxwork or Cellular Limonite; in this case, the soluble materiel has chemical weathered away leaving only the quartz.   Boxwork is  associated with mineral deposits but also forms in limestone and as cave deposits.  You have found some nice samples!

Edited by 4meter
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