LanceH Posted March 29, 2023 Share Posted March 29, 2023 I found this dark blue coating on very dark red sandstone. Is this hematite? This was found in either the Thrifty-Graham or maybe even the Markley Formation in Jack County, Texas. Link to comment Share on other sites More sharing options...
ClearLake Posted March 29, 2023 Share Posted March 29, 2023 Do you have a streak plate? Or some slightly rough porcelain? Hematite will produce a reddish brown streak. Link to comment Share on other sites More sharing options...
ynot Posted March 29, 2023 Share Posted March 29, 2023 there are several iron minerals that it could be. Hematite is one. The streak test would hep to see which one it is. Use unglazed porcelain for this test. The underside of the toilettes tank lid will work. 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
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