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Post by Peruano on Jul 28, 2017 7:08:31 GMT -5
Just trying to use a bit of logic on the system, I'd guess that the term clinker refers to the way a rock has been modified by heat (due to coal fire or ??) - and the original rock could have been almost any type of material (although some would be more prone to modification than others). Thus I wouldn't expect clinkers to have consistent hardness or utility in lapidary. Some will be nice like the ones posted first and others?? Seeing the reds is not surprising because reds are often enhanced by heating. Are you listening James? So . . . I'm guessing clinker is a generic term describing what happened to a rock rather than where it came from or what it was. OK I"ll go back for my second cup of coffee now.
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minerken
Cave Dweller
Member since August 2013
Posts: 466
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Post by minerken on Jul 28, 2017 10:39:48 GMT -5
Peruano I think your logic is correct ETYMOLOGY OF THE WORD CLINKER From Dutch klinker a type of brick, from obsolete klinckaerd, literally: something that clinks (referring to the sound produced when one was struck), from klinken to clink1. Definition of clinker 1 : a brick that has been burned too much in the kiln 2 : stony matter fused together : slag NEW! First Known Use: 1641
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Post by tims on Aug 2, 2017 0:05:47 GMT -5
Just trying to use a bit of logic on the system, I'd guess that the term clinker refers to the way a rock has been modified by heat (due to coal fire or ??) - and the original rock could have been almost any type of material (although some would be more prone to modification than others). Thus I wouldn't expect clinkers to have consistent hardness or utility in lapidary. Some will be nice like the ones posted first and others?? Seeing the reds is not surprising because reds are often enhanced by heating. Are you listening James? So . . . I'm guessing clinker is a generic term describing what happened to a rock rather than where it came from or what it was. OK I"ll go back for my second cup of coffee now. I think the hard and colorful clinker here is primarily baked shale with various impurities that add color. The red i attribute to iron content but it may be a poor assumption. Geological surveys etc for the area focus primarily on the abundant fossil fuels and only mention clinker as a side-note (if at all). For instance: " Differential erosion of soft Tertiary sandstones and shales and more resistant clinker (baked shales resulting from burning of coals seams) create an irregular topography of rolling to steep hills and badlands. " Oil and Gas Resources of Thunder Basin National Grassland, Wyoming www.fs.fed.us/ngp/final/pdf_feis_append/RFD_TBNG_010531.pdf
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rockdunker
noticing nice landscape pebbles
Member since July 2017
Posts: 97
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Post by rockdunker on Aug 6, 2017 22:29:07 GMT -5
That is cool stuff. ColoCliff sent me over here to identify the clinker that I have been picking in North Dakota. It sure does shine when polished.
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clinker
Aug 8, 2017 19:44:28 GMT -5
Post by tims on Aug 8, 2017 19:44:28 GMT -5
That is cool stuff. ColoCliff sent me over here to identify the clinker that I have been picking in North Dakota. It sure does shine when polished. Do you have any pics posted? Would love to compare colors.
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rockdunker
noticing nice landscape pebbles
Member since July 2017
Posts: 97
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Post by rockdunker on Aug 10, 2017 17:17:30 GMT -5
That is cool stuff. ColoCliff sent me over here to identify the clinker that I have been picking in North Dakota. It sure does shine when polished. Do you have any pics posted? Would love to compare colors. I am not currently setup to post images. I'll pm you my email and phone number. If you would like feel free to post images.
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clinker
Aug 10, 2017 23:12:34 GMT -5
Post by nowyo on Aug 10, 2017 23:12:34 GMT -5
Interesting stuff. We don't get to that part of the state often, but I always thought the clinker looked cool and wondered how it would turn out. Never did grab more than a few pieces. Thanks for posting those pics.
Russ
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