The major axis is symmetrically polar and results in a hemimorphic crystal structure. In other words, there is no symmetry element, like a mirror or two fold rotational axis, perpendicular to the major axis and thus crystal faces on top of the crystal are not repeated on the bottom of the crystal. Color is orange-yellow to deep red or brown. Luster is adamantine. Transparency crystals are commonly translucent more rarely transparent.
Fracture is conchoidal.
Streak is orange-yellow. There is a basal parting. Associated Minerals include calcite , rhodonite , willemite , franklinite , tephorite , pyroxmangite and other rare Sterling Hill and Franklin, New Jersey minerals. Notable Occurrences include the Sterling Hill and Franklin, New Jersey, USA locations where it is found in abundance. Best Field Indicators are luster, color, occurrence, associations, cleavage, parting and streak.