Many of these specimens were found in San Antonio, TX, and the Texas Hillcountry (Kerrville and Bulverde). They seem to have iron content due to rust/oxidized color. Some, but not all, specimens have magnetic properties with a strong magnet.

When I was a kid I thought they were meteorites, but having seen true meteorites, I know these are different.

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Your specimens appear to be goethite. The map below shows mines from Mineral Resources Data System (MRDS) where goethite has been reported.

Iron ore map of Texas


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