texhex
starting to spend too much on rocks
Rocks 10 - TexHex 2
Member since August 2023
Posts: 149
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Post by texhex on Nov 5, 2023 9:42:23 GMT -5
Can anyone help me identify this central Texas iron-based rock? Many of these have unique patterns. I know they are not as appealing as the Michigan agates, but I like them.
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Post by rmf on Nov 6, 2023 18:40:03 GMT -5
It is sandstone cemented by iron usually in the form of limonite. also Geothite and the red indicates some hematite(ocre). these are frequently the result of pyrite/marcasite forming in the sedimentary rocks then breaking down to form the various iron oxides listed above.
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texhex
starting to spend too much on rocks
Rocks 10 - TexHex 2
Member since August 2023
Posts: 149
|
Post by texhex on Nov 8, 2023 21:58:33 GMT -5
It is sandstone cemented by iron usually in the form of limonite. also Geothite and the red indicates some hematite(ocre). these are frequently the result of pyrite/marcasite forming in the sedimentary rocks then breaking down to form the various iron oxides listed above. Thank you for the interesting answer. This sounds like a complicated process of nature to form this interesting piece of art. My degree is in Sociology, so I will have to look up some of these minerals. Your reply is greatly appreciated. I feel the most frustrating part of this hobby for me is identifying the rocks.
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Post by velodromed on Nov 9, 2023 12:34:36 GMT -5
It is sandstone cemented by iron usually in the form of limonite. also Geothite and the red indicates some hematite(ocre). these are frequently the result of pyrite/marcasite forming in the sedimentary rocks then breaking down to form the various iron oxides listed above. This is really nice to know as we run across these as well.
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