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Post by fernwood on Aug 24, 2019 6:24:07 GMT -5
No location known. Paper attached to rock said Ruby, but looks like Garnet or just another type of red/green crystals to me. Might have been found at a CO mountains mine. The matrix is about 6 hardness. Dry and wet photos. Thank you
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Post by rmf on Aug 24, 2019 9:46:23 GMT -5
fernwood I am soooo ashamed you do not recognize this rock. Although this is brecciated which adds confusion, this rock is YOUR neighbor. It is Baraboo Quartzite. As a former WIonian I have found this same pink/purple Quartzite in WI, IA, MO, IL. The glacier really pushed this stuff around. The Baraboo double plunging syncline (think bottom half of a football shaped bowl) was from a formation of sand that was 5000 ft thick. When the last glacial period occurred the Baraboo Syncline split the glacier which created the drifless area in south west WI, south east MN, north east Iowa. It does take a good polish. I have seen several pieces of this material brecciated like yours, but mostly Baraboo quartzite is massive.
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Post by fernwood on Aug 24, 2019 17:51:13 GMT -5
This looks very different than the banded Baraboo Quartzite I have. My large pieces are very granular. Would have never thought this was BQ.
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fuss
spending too much on rocks
Member since October 2018
Posts: 250
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Post by fuss on Aug 24, 2019 23:07:29 GMT -5
Agree with rmf. It is commonly used as railroad track ballast here in WI as well as the welded tuff/rhyolite from the Utley Quarry. I happen to have a few samples very similar to yours. IMG_20190824_225333038 by fuss_, on Flickr
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Post by fernwood on Aug 25, 2019 3:43:49 GMT -5
Interesting. Thanks.
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