16aadw.tr ((HEMATITE variety RAINBOW HEMATITE)), $25 MINIMUM BID, Andrade mine, Joćo Monlevade, Minas Gerais, Brazil, 7.5 x 3.5 x 1.3 cm, Cabinet | |
Here is an interesting Hematite used in jewelry. Per a post on Mindat.org by John Sobolewski which says that the color is supposedly caused by a very thin layer of aluminum phosphate on mica-like thin flakes of Hematite |