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Most say this is red Jasper but the flecks ? (Read 114 times)

Dagwood YaBB Newbies Offline RockHoundLounger Posts: 5 Location: Minnesota Joined: Apr 21^st, 2024 Gender:	Most say this is red Jasper but the flecks ? May 5^th, 2024 at 12:25pm	Print Post
	Found a number of these in the Minnesota river valley. Hardness of 7-8. The flecks are making me question if this is Jasper? Any thoughts would be appreciated.

	IMG_1640.png ( 2981 KB \| 8 Downloads )
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Dagwood YaBB Newbies Offline RockHoundLounger Posts: 5 Location: Minnesota Joined: Apr 21^st, 2024 Gender:	Re: Most say this is red Jasper but the flecks ? Reply #1 - May 5^th, 2024 at 12:26pm	Print Post
	Another example

	IMG_1642.png ( 1073 KB \| 5 Downloads )
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Dagwood YaBB Newbies Offline RockHoundLounger Posts: 5 Location: Minnesota Joined: Apr 21^st, 2024 Gender:	Re: Most say this is red Jasper but the flecks ? Reply #2 - May 5^th, 2024 at 12:28pm	Print Post
	One more. I need to learn how to do multiple photos in one post.

	IMG_1641.png ( 1177 KB \| 10 Downloads )
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Scott LaBorde RHL Administrator Offline "Rock it" science! Posts: 2975 Location: Wake Forest, NC Joined: Sep 28^th, 2010 Gender:	Re: Most say this is red Jasper but the flecks ? Reply #3 - May 6^th, 2024 at 2:27pm	Print Post
	Looking at your first picture, the inclusions might be fossils. The finger nail shapes are usually formed by bivalve shells.

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Dagwood YaBB Newbies Offline RockHoundLounger Posts: 5 Location: Minnesota Joined: Apr 21^st, 2024 Gender:	Re: Most say this is red Jasper but the flecks ? Reply #4 - May 6^th, 2024 at 6:19pm	Print Post
	I never thought of fossils. Interesting


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JoeM God Member Offline I Love YaBB 2.5 AE! Posts: 4211 Location: Wake County, NC Joined: Sep 30^th, 2010 Gender:	Re: Most say this is red Jasper but the flecks ? Reply #5 - May 6^th, 2024 at 11:48pm	Print Post
	Yes, interesting question. Is this a sedimentary formation like a fine grained sandstone with little clasts? Or is it a porphyritic igneous rock like the piece of Rhyolite in this link. https://viewer.gigamacro.com/view/4tCMowjgJ3hmCKyQ?x1=13589.00&y1=-9807.50&res1=... The clasts would be more rounded in the sandstone and sharper and more angular in the igneous rock.


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Dagwood YaBB Newbies Offline RockHoundLounger Posts: 5 Location: Minnesota Joined: Apr 21^st, 2024 Gender:	Re: Most say this is red Jasper but the flecks ? Reply #6 - May 7^th, 2024 at 10:00pm	Print Post
	porphyritic igneous for sure. Very similar to the photo you dropped in. I’m guessing on the hardness scale it would be a 7-8. It does polish nicely.


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