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Is this petrified coral?


Mykkhul97

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I have about a hundred pounds of what I believe to be fossilized coral and sea plants. Any help would be appreciated.

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fifbrindacier

Hi, in your two first photos and in the last one i see blocks of calcite. Does it fizz with vinegar ?

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The specimen has a botryoidal outer layer.
Which part reacts to vinegar?

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The whiter/clear areas look like botryoidal chalcedony, which can have calcite associated with it.

See if those areas will scratch with a knife.

Where were these found?

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I scraped hard with a knife and you barely could see anything. I found them in a 5 gallon bucket in a barn. Almost every piece has the white sections. Some look like bubbles and some have mouths. 

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1 hour ago, abyssunder said:

Were the specimens found in cave?

I don't know. I found them in a 5 gallon bucket in a barn 

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I don't see any coral here but the whitish chunks remind me of Tampa Bay chalcedony with the botryoidal bubbles and crystals. (see examples below 1) crystals 2) with botryoidal bubbles cut in half)

The 3rd one looks like a nodule concretion, pretty cool.

Like the others said, we need a location for a proper ID and measurements would help.

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My first thought was agate, that was the reason for my first question. :)

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1 minute ago, Bronzviking said:

I don't see any coral here but the whitish chunks remind me of Tampa Bay chalcedony with the botryoidal bubbles and crystals. (see examples below 1) crystals 2) with botryoidal bubbles cut in half)

The 3rd one looks like a nodule concretion, pretty cool.

Like the others said, we need a location for a proper ID and measurements would help.

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image.thumb.png.8621e2bce59d4b16799ededda4beb434.png

The people I got these from said Arizona. Some are the size of baseball's, golf balls and quarters. They all look alike. 

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They are chalcedony / agate.

This is a common type of rock found throughout the western US (and many other places).

Usually associated with volcanic rock.

 

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3 minutes ago, ynot said:

They are chalcedony / agate.

This is a common type of rock found throughout the western US (and many other places).

Usually associated with volcanic rock.

 

So, I wasn't wrong on this. :1-SlapHands_zpsbb015b76:

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I agree with ynot they are white chalcedony found in Arizona. Do a google image search for Arizona Chalcedony and you will see many examples on what you have. The pieces you say have mouths are called chalcedony desert roses. (see below)

 

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Chalcedony forms from watery silica gels at relatively low temperatures. The silica is often released by the weathering of rocks that are initially void of silica, for example basalt, and accordingly the formation of chalcedony took place very near to the surface. Chalcedony can be found in weathering volcanic rocks, but also in sedimentary ones, often together with agate. In igneous or metamorphic rocks chalcedony is very rare and only forms veins in cracks that have been percolated by warm rising silica-rich brines. Occasionally chalcedony is found as a petrifying agent in fossils. Here's a good link if you want to read about it.

http://www.quartzpage.de/chalcedony.html

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" Agate is a variety of chalcedony characterized by either transparency or color patterns, such as multi-colored curved or angular banding. Opaque varieties are sometimes referred to as jasper.[3] Fire agate shows iridescent phenomena on a brown background; iris agate shows exceptional iridescence when light (especially pinpointed light) is shone through the stone. Landscape agate is chalcedony with a number of different mineral impurities making the stone resemble landscapes. " - Wikipedia / Chalcedony

 

" In the formation of an ordinary agate, it is probable that waters containing silica in solution—derived, perhaps, from the decomposition of some of the silicates in the lava itself—percolated through the rock and deposited a siliceous gel in the interior of the vesicles. Variations in the character of the solution or in the conditions of deposition may cause a corresponding variation in the successive layers, so that bands of chalcedony often alternate with layers of crystalline quartz. Several vapour-vesicles may unite while the rock is still viscous, and thus form a large cavity which may become the home of an agate of exceptional size; thus a Brazilian geode lined with amethyst and weighing 35 tons was exhibited at the Düsseldorf Exhibition of 1902. Perhaps the most comprehensive review of agate chemistry is a recent text by Moxon cited below. " - Wikipedia / Agate

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1 hour ago, Bronzviking said:

I agree with ynot they are white chalcedony found in Arizona. Do a google image search for Arizona Chalcedony and you will see many examples on what you have. The pieces you say have mouths are called chalcedony desert roses. (see below)

 

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Ok. Thank you for the information. So some of the pieces has imprints of patterns possibly from plants. Is that common to find both chalcedony with fossils?

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29 minutes ago, Mykkhul97 said:

Ok. Thank you for the information. So some of the pieces has imprints of patterns possibly from plants. Is that common to find both chalcedony with fossils?

No.

There are no imprints or fossils found in this type of agate deposit.

 

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