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17 Aug-16:23:52 Re: collection of michael shaw (Michael Shaw)
17 Aug-10:30:35 Re: east coast mineral and fossil show 2019 (Vic Rzonca)
17 Aug-09:39:03 Need help to confirm the composition of a specimen (Dany Mabillard)
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16 Aug-13:37:41 Re: east coast mineral and fossil show 2019 (Vic Rzonca)
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15 Aug-16:18:24 The mizunaka collection - calcite (Am Mizunaka)
15 Aug-15:43:34 Re: collection of fiebre verde - muzo (#744) (Fiebre Verde)
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14 Aug-11:05:00 Re: collection of michael shaw (Michael Shaw)
13 Aug-22:38:19 Re: could this be opal? (Steveb)
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13 Aug-15:10:40 Re: could this be opal? (Kushmeja)
13 Aug-15:06:42 Could this be opal? (Andreas)
13 Aug-14:29:08 The mizunaka collection - quartz with calcite (Am Mizunaka)
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13 Aug-09:48:26 Re: don lum collection (Don Lum)
13 Aug-02:50:46 Re: don lum collection (Tobi)
12 Aug-20:38:33 Re: don lum collection (Don Lum)
12 Aug-15:42:21 Re: east coast mineral and fossil show 2019 (Bob Harman)
12 Aug-15:33:46 Re: does anyone know what the proper name for "jack rock" is? (Bob Harman)
12 Aug-13:05:06 Re: does anyone know what the proper name for "jack rock" is? (Dale Hallmark)

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Drusy covered coral landscape rock?
  
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fuss




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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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