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Drusy covered coral landscape rock?
  
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fuss




Joined: 16 Aug 2018
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Location: Wisconsin

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PostPosted: Jan 18, 2019 00:59    Post subject: Drusy covered coral landscape rock?  

I came upon this while on an appointment at a customers house. I was only able to look at it for a minute and snapped this one photo. The homeowner did not know what it is and has had it as a decorative landscape rock for 30+ years in her yard. So to me it looks like it might be a really large(guessing 30+lbs) coral that is covered in drusy quartz. Any opinions? Thx


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vic rzonca




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PostPosted: Jan 18, 2019 01:18    Post subject: Re: Drusy covered coral landscape rock?  

Silicified stromatolite. Stromatolites are layered bio-chemical accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms (microbial mats) of microorganisms, especially cyanobacteria. They exhibit a variety of forms and structures, or morphologies, including conical, stratiform, branching, dome shaped, and columnar types. Stromatolites occur widely in the fossil record of the Precambrian. Only a guess but similar structures are found in the dolostone of the Little Falls formation in up state New York, with druzy quartz lining voids. Like I said, just a guess from the image.
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Bob Harman




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PostPosted: Jan 18, 2019 02:23    Post subject: Re: Drusy covered coral landscape rock?  

It might be what VIC says, but similar stuff comes from Iron County Missouri; silicified vuggy limestone with extensive druzy quartz lining the vugs.
As it has been sitting out in the yard for years, I'll bet that soaking the rock in a tub of a water/bleach mix will get rid of most of the green (organics?), brightening up the quartz. BOB
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fuss




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PostPosted: Jan 18, 2019 12:52    Post subject: Re: Drusy covered coral landscape rock?  

Thx guys, both responses are good possibilities, and yes Bob it has moss of some kind growing on it and a cleaning would be a good idea.
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