Luster is metallic to dull. Crystals are opaque, translucent in only thin splinters. Crystal Habit is typically massive and granular. Crystals are uncommon and tabular. Cleavage is good , but rarely seen except in rare large crystals.
Fracture is conchoidal to uneven.
Hardness is approximately 3, but is variable. Streak is black. Associated Minerals are limonite , hematite , quartz , manganite , psilomelane , pyrolusite and other manganese and iron oxide minerals. Best Field Indicators are habits, luster, softness, color and streak.