bobsaveg
off to a rocking start
Member since December 2021
Posts: 5
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Post by bobsaveg on Dec 3, 2021 21:28:59 GMT -5
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Post by rockjunquie on Dec 3, 2021 21:38:22 GMT -5
Welcome from Virginia! Good job on the pictures and steel test.  Looks like jasper, but someone else may be able to be more specific. |
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Post by jasoninsd on Dec 3, 2021 21:59:24 GMT -5
Welcome to the forum from South Dakota! I can't give you a positive ID on it...but I can tell you I think it looks like a seriously cool rock! I can see some amazing cabs coming out of that beauty!  |
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Tommy
Administrator 
Member since January 2013
Posts: 13,011
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Post by Tommy on Dec 4, 2021 7:48:43 GMT -5
I'm just getting into rockhounding and tumbling, so I'm lost trying to figure out the names of some probably very common rocks and minerals. I found this in Santa Rosa Creek in Santa Rosa California. I found this guy and another one similar to it about 2 miles farther down the creek. when scratched with metal dental tool leave a metal line that rubs off have a bunch of wet picture below of different sides as well as one dry photo.  Hi bobsaveg, welcome from Napa. Congrats on finding a good looking rock! I will never look at Santa Rosa Creek the same way again when I drive over it  I'm going to go out on a limb here and say that based on this one close up photo above I think it looks like jasper floating in what I like to call 'dirty agate.' If you Google "Stoney Creek jasper" you'll see some examples of what I'm talking about. It's the black that has me puzzled and I'm wondering if it's just surface staining. It's common to find black locally but usually it's from hematite and isn't quite as sharp of a black color. |
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Post by Peruano on Dec 4, 2021 11:20:49 GMT -5
And one of the things often found where there is hematite is limonite. Does it have a streak thats red or one that is brownish ochre colored? Maybe its not a jasper agate at all.
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Post by stonemon on Dec 4, 2021 11:36:47 GMT -5
Welcome!
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Sabre52
Cave Dweller 
Me and my gal, Rosie
Member since August 2005
Posts: 20,514
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Post by Sabre52 on Dec 4, 2021 15:53:59 GMT -5
There are a lot of jasper types in the California Coast Range. Many are from the Franciscan Formation and are known as Franciscan Mélange Jasper. Commonly colored by iron compounds and black manganese inclusions are not uncommon.
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Looks like jasper, but someone else may be able to be more specific. 
