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Post by Bob on Sept 12, 2020 19:54:56 GMT -5
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 937
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Post by lordsorril on Sept 13, 2020 6:03:27 GMT -5
That looks like a great piece of Quartzite! It looks so grainy, but, you still got a great shine on it!
I think sizing terms are subjective at the moment: 'Large' to me is anything apple and above, and 'Monster' to me is anything that started at 5lbs. or above in the barrel (of course it can grind down well below 5lb.).
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Post by Bob on Sept 14, 2020 23:50:35 GMT -5
I have read that the impurities prior to and during resilisification cause the color and those cool layers. You can almost imagine pouring different colors of sand grains into a jar. This rock turned out so nice, I have been looking for another for over 4 years to no success! Even though I find large amounts of quartzite in Ark River drainages in CO, OK, and other places. To add insult, this was laying in the ditch beside a road among 100s if not 1,000s of other pieces, yet no other caught my eye.
Does anyone know if opaque, patterned quartzite is rare?
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Post by Bob on Oct 7, 2020 10:36:44 GMT -5
Here's my attempt to classify this material.
Type: Metamorphic rock (metamorphosed Quartz sandstone w up to 20% inclusions). Common worldwide. Subtype: Non-categorized (as opposed to Aventurine) = Quartzite, a named rock.
It's "remade" from sand grains from the mineral Quartz. Pure is white to grey. Other colors are from various types of impurities. Mohs 7.0.
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