Hollandite (Manganese Ore), Jeff Davis County, Texas
Hollandite (a Manganese Ore) Location: the Walter Mayfield prospect is located about 4.5 miles southwest of Chispa on the Southern Pacific Railroad. County: Jeff Davis County Chemical Composition: Ba(Mn+4, Mn+3)8O16 Crystal system: Monoclinic, this is an example of the botyroidal mineral habit Specimen size: 3 x 2 x 2.5 inches Specimen weight: 385 grams Collection reference: TMM 198 In the Jackson School of Geosciences Collection at the University of Texas at Austin. Additional Information: This specimen was listed as being personally collected by Virgil Barnes. Hollandite was found in botyroidal masses containing about 15% barium, that were interpreted to occupy fractures in the Mayfield fault zone.