USA121 - Brookite and Quartz - Magnet Cove, Hot Spring County, Arkansas

Sharp crystals of brookite to 7 mm are on a limonitic matrix in this classic from Magnet Cove. There are also milky, doubly-terminated quartz crystals to 5 mm. The reverse side of the matrix has several apparent pseudomorphs after a cubic species, possibly pyrite, although I have not identified them. Ex. Ernie and Vera Schlichter collection. For more information on this locality, see Rocks and Minerals, Volume 64, Issue 4. 6.1 x 3.0 x 2.9 cm.