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Post by fernwood on Apr 23, 2018 10:24:47 GMT -5
Posting this for feedback only because it is similar to one that Jugglerguy found and posted. Similar in that it has both the layers and areas of red, agate like formations. So, is it fossil algae, banded Jasper/Chert, or something else? The darker brown/black areas can be scratched off easy with fingernails. Others have a chalcedony appearance. toiv0 do you have any ideas? Have about 12 similar to this found on my land. Thank you. Sorry for the blurry photos.  IMG_9973  IMG_9979  IMG_9965  IMG_9962  IMG_9997  IMG_9990  IMG_9983 |
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Post by fernwood on Apr 23, 2018 10:26:00 GMT -5
This also has some areas with opal like appearance, the blue ones in the photos.
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Post by vegasjames on Apr 23, 2018 17:03:51 GMT -5
Looks like chalcedony. Opal converts in to chalcedony so there can be a mix as it is transitioning.
Opal starts as a silica gel. As the atoms start to squeeze together water is pushed out forming opal. As all the water squeezes out the opal converts in to chalcedony.
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Post by toiv0 on Apr 23, 2018 18:42:10 GMT -5
How hard is it? In your box I sent you was a piece of WI flint, I cant remember what the outside looked like. The flint can be found in nodules and makes a great cab with it being dark in the middle.
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Post by fernwood on Apr 23, 2018 19:04:41 GMT -5
Hardness ranges from 7 on the red/white areas to maybe a 3 or less on the brown/black areas. I can pick parts of the black/brown areas off with finger nails.
Outside of the flint was a creamy white.
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Post by rmf on Apr 26, 2018 18:37:00 GMT -5
outside looks like weathered chert but the core looks like chalcedony. That looks like a prime piece to clean up in the tumbler.
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goatgrinder
spending too much on rocks
Make mine a man cave
Member since January 2017
Posts: 368 
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Post by goatgrinder on Apr 26, 2018 20:19:47 GMT -5
outside looks like weathered chert but the core looks like chalcedony. That looks like a prime piece to clean up in the tumbler. True words for rock enthusiast. |
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