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What is this petrified looking rock,
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<blockquote data-quote="gman4691" data-source="post: 1804798" data-attributes="member: 43107"><p>Late to this thread but:</p><p></p><p>Haven't seen this stuff since college (geology major)...hard to identify rocks from images but I think you are correct here. If you happen to have some dilute hydrochloric acid, put a drop or two on it...if it immediately begins to fizz, it is likely tufa (limestone will do the same thing due to the presence of calcium carbonate). If it doesn't, scratch the surface just enough to make a little dust and try again. If it makes the dust fizz, it is higher in magnesium (like dolomite). The structures do appear to be living organisms that were replaced with calcium carbonate. Limestone is typically more layered due to depositional environment (typically building up on ocean floor at certain depths). Tufa is very porous due to decay of plant material within the rock & the mechanics of deposition (typically calcium rich fresh water flowing in cold to warm groundwater where the calcium carbonate precipitates out). The fossils are probably casts of plants that grew where the groundwater discharged. Travertine is similar in composition but is formed as a hydrothermal fresh water deposit and is much less porous with virtually no fossilized remains visible beyond some tiny microbes. Overall, a nice looking rock (in my opinion)...I would keep it. I-Naturalist is a good website for identification of lots of things (plants, rocks, insects, etc.) - just upload the photo and wait - I usually get very good results through I-Naturalist. If they come up with something different, I will stand humbly corrected.</p></blockquote><p></p>
[QUOTE="gman4691, post: 1804798, member: 43107"] Late to this thread but: Haven't seen this stuff since college (geology major)...hard to identify rocks from images but I think you are correct here. If you happen to have some dilute hydrochloric acid, put a drop or two on it...if it immediately begins to fizz, it is likely tufa (limestone will do the same thing due to the presence of calcium carbonate). If it doesn't, scratch the surface just enough to make a little dust and try again. If it makes the dust fizz, it is higher in magnesium (like dolomite). The structures do appear to be living organisms that were replaced with calcium carbonate. Limestone is typically more layered due to depositional environment (typically building up on ocean floor at certain depths). Tufa is very porous due to decay of plant material within the rock & the mechanics of deposition (typically calcium rich fresh water flowing in cold to warm groundwater where the calcium carbonate precipitates out). The fossils are probably casts of plants that grew where the groundwater discharged. Travertine is similar in composition but is formed as a hydrothermal fresh water deposit and is much less porous with virtually no fossilized remains visible beyond some tiny microbes. Overall, a nice looking rock (in my opinion)...I would keep it. I-Naturalist is a good website for identification of lots of things (plants, rocks, insects, etc.) - just upload the photo and wait - I usually get very good results through I-Naturalist. If they come up with something different, I will stand humbly corrected. [/QUOTE]
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What is this petrified looking rock,
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