Red scarlet 2.5 scarlet surface tarnishes prousite black 2.5 vermilion surface scarlet to cinnabar dark red ochre 7 white non-crystalline jasper 6 ochre red color red to hematite almost black rose 4 white effervesces in rhodochrosite warm acid dark 4 orange zincite 2.5 purplish red surface tarnishes pyrargyrite black brownish 3.5 brownish red cuprite Orange 3.5 white to pyromorphite yellowish 1-1½ orange realgar Blue 5.5-6 white in igneous rocks sodalite azure 4 azure azurite sky 7 & 4.5 white blade-like crystals cyanite turquoise 6 blue non-crystalline turquois 2-4 white chrysocolla Green malachite 3.5 lighter green malachite olive 6.5-7 white in igneous rocks olivine 3.5 white to yellow pyromorphite 2 white mica-like cleavage chlorite 1 white greasy feel, color talc light to dark olive green yellowish 6.5 white epidote 2.5-4 white color yellow green serpentine to olive Yellow golden 2.5 shining non-crystalline gold brassy 6 greenish-black usually crystalline pyrite 6 greenish-gray color pale brassy marcasite yellow, usually non-crystalline 5.5 greenish-black colors nitric acid millerite green 4 greenish-black color golden chalcopyrite similar to gold 3.5 dark brown purplish tarnish tetrahedrite on surface bronze 5.5 pale color with coppery niccolite brownish-black cast 4 dark gray-black with speedy black pyrrhotite tarnish 3 gray-black brownish with bornite