It is probably due to an alteration of molybdenite. Color is usually yellow to pale orange-yellow. Luster is dull to adamantine. Diaphaneity is transparent to translucent. Crystal Habits include acicular crystals to 2mm and sharp tetragonal prisms with very steep pyramidal terminations.
Fracture is uneven to subconchoidal.
Hardness is 3. Streak is white. Associated Minerals include hemimorphite, galena and natrolite.