bluish tarnish 2.5 shining coppery red color copper sulphur 3.5 white to compact masses pyromorphite yellowish 2 yellow sulphur 1-3 earthy masses carnotite Brown violet 1½ shining tarnishes black cerargyrite yellowish 7.5 white 4-sided prisms zircon 6.5 gray cassiterite 5.5 ochre yellow compact to earthy limonite masses 5 brownish-yellow goethite 4.5 black wolframite 3.5 yellowish-brown sphalerite 3.5 white siderite grayish 7.5 white often twinned staurolite 6.5 pale brown rutile 3.5 white to earthy masses pyromorphite yellowish reddish 7 white dodecahedrons & garnet trapezohedrons Black 6.5 gray cassiterite 6 reddish-brown franklinite 6 black magnetic magnetite 5.5 dark brown chromite 5.5 black yellow precipitate wolframite in sulphuric acid 5-6 black non-magnetic ilmenite 5-6 brownish-black compact masses psilomelane 5 brownish-yellow surface often goethite brownish 3.5 dark brown tetrahedrons tetrahedrite 2.5 silvery fresh surfaces silver silver color 2.5 scarlet fresh surfaces prousite bright red 2.5 purplish red fresh surfaces red pyrargyrite 2 black earthy masses pyrolusite 1 steel gray greasy feel graphite Metallic 2.5 black tarnishes black, chalcocite Gray bluish, or green 2.5 lead gray sectile argentite 2.5 lead gray cubic cleavage galena 2 lead gray long prismatic stibnite crystals 1.5 bluish gray in scales molybdenite