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Conglomerate but what type of minerals
  
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James W




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PostPosted: Apr 23, 2018 18:11    Post subject: Conglomerate but what type of minerals  

This is my last post until later, I also have a few rocks I have again gathered in Central Texas. I really enjoy the coloration of the first conglomeration, but am interested in what it is? The second red marble? Was found nearby. Again, not an expert and hopefully won’t plague the forums in the future haha


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James W




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PostPosted: Apr 23, 2018 18:12    Post subject: Re: Conglomerate but what type of minerals  

Photo 2


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James W




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PostPosted: Apr 23, 2018 18:13    Post subject: Re: Conglomerate but what type of minerals  

Found nearby


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Bob Harman




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PostPosted: Apr 23, 2018 18:25    Post subject: Re: Conglomerate but what type of minerals  

Not an expert in this, but your middle photo appears to show conchoidal fractures typical for microcrystalline quartz, commonly called chert or a chert nodule. Your first and last pictures suggest broken up pieces of the same silicified quartz in bone or wood. Could you have found a portion of fossilized bone or petrified wood as part of the chert?

It might help to do some testing, but in this case I doubt testing will tell much more. BOB
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Dale Hallmark




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PostPosted: Apr 23, 2018 18:44    Post subject: Re: Conglomerate but what type of minerals  

Central Texas is largely limestone and sandstone other than the llano uplift which is Granite and Granitic pegmatite. There is a lot of limestone such as the Edwards limestone which is a reef complex, a Rudist reef if I remember correctly.

Flint, Agate, and chalcedony are common and in the right places so is petrified wood and Lycopods, Ammonites and all sort of bivalves and gastropods.

Near Mason there is found yellow Topaz. Once you start looking Texas has quite a bit of interest.

No doubt your sample is a "flint" nodule.

Dale
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