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Can someone help me identify this?


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These are very nice samples of the famous Texas Ironstone.  The outer shell is Hematite, and the inner core is a mixture of Goethite and Limonite.  This was extensively mined back in the late 1800s, and early 1900s as a source of iron.  There are many USGS publication from the 1920s on the mines and the source of the Ironstones.

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