MINERAL NAME, FORMULA
RED, REDDISH BROWN, BLACK color; equant crystals, often showing 12 to 24 faces; may show parting that may be confused with cleavage; can be massive; H=6.5-7.5.
DARK to LIGHT GRAY, but can be any color including purple, pink, yellow, etc. CONCHOIDAL FRACTURE; vitreous luster; H=7; may have crystal faces.
GREEN, brown, yellow color; vitreous luster; GENERALLY GRANULAR; heavy; H=6.