Magnetite on Sandstone - South Africa - 1 LB 2 OZ 5" X 3" Approx Magnetite , a black, iron-rich mineral, is a common heavy mineral found in sandstone, often appearing as black sand or streaks due to its density and magnetic propertiesand can be concentrated by wind and water. Composition: Magnetite is an iron oxide mineral with the chemical formula Fe3O4. Appearance: It's black or brownish-black with a metallic luster and leaves a black streak. Magnetic Properties: Magnetite is naturally magnetic, meaning it attracts magnets. Hardness: It has a Mohs hardness of 5.5 to 6.5. Density: Magnetite is a heavy mineral, denser than most other sand grains, which leads to its concentration in certain areas. Occurrence: Magnetite is found in igneous, metamorphic, and sedimentary rocks. ** SEE VIDEO ( IF AVAILABLE ) FOR FULL EFFECTS ** ** WE HAVE MANY BEAUTIFUL MINERALSPECIMENS FROM THE USA AROUND THE GLOBE ** MOST ARE FROM OUR VARIOUS TRIPS ** ** SEE MY STORE ** ** OUR GOAL IS TO MAKE COLLECTING FUN AFFORDABLE FOR ALL WITH GREAT LOW PRICING * ITEM # 282