It typically is found as crusts and botryoidal masses or nodules.
Crystals are fibrous and found in tufted aggregates.
The color is an attractive bluish green. Rosasite is associated with red limonite and other such colorful minerals as aurichalcite, smithsonite and hemimorphite. However rosasite is usually more massive but not lamellar. Color is usually a bluish-green to green. Luster is silky to vitreous to dull for massive specimens.