question about indian paint stone

rockjunquie Global Moderator Member since March 2012 Posts: 34,958	question about indian paint stone Mar 7, 2016 12:44:01 GMT -5 micellular likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rockjunquie on Mar 7, 2016 12:44:01 GMT -5 I often am confused by black shiny lines in this material- is it pyrite, graphite, hematite or something else?

150FromFundy
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Member since February 2009
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question about indian paint stone Mar 7, 2016 17:49:01 GMT -5 rockjunquie likes this

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Post by 150FromFundy on Mar 7, 2016 17:49:01 GMT -5

Trace amounts of iron and manganese that are drawn into minute cracks the sandstone by capillary action. Found it on the Internet, so wait for confirmation. Need pictures. It can be beautiful stuff.

Darryl.

Sabre52
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Me and my gal, Rosie

Member since August 2005
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question about indian paint stone Mar 7, 2016 19:12:45 GMT -5 rockjunquie and micellular like this

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Post by Sabre52 on Mar 7, 2016 19:12:45 GMT -5

Yeah, I think the black is manganese in the argillite rock ( finer particles than sandstone) and the reds, browns and golds are iron. Think the Indian Paint rock is very similar to the Aussie Print stone and zebra stone which are also argillite but with mostly red coloring due to iron oxides. Optical grade tin oxide works best for polish but for me, it's always difficult to get anything other than a satin finish....Mel

Last Edit: Mar 7, 2016 19:14:29 GMT -5 by Sabre52

Tommy
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question about indian paint stone Mar 7, 2016 19:29:40 GMT -5 rockjunquie likes this

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Post by Tommy on Mar 7, 2016 19:29:40 GMT -5

Mar 7, 2016 12:44:01 GMT -5 rockjunquie said:

I often am confused by black shiny lines in this material- is it pyrite, graphite, hematite or something else?

That's a great question and one I've wondered about too. It's the only part that will take a shine too haha

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