melanopathy

[Gr. melas (neut. mel an ) black, and pathos =suffering, an affection.] Pathology : A disease of the skin, consisting in the augmentation of black pigment, generally in patches. The discoloration may vary from mere duskine to the deepest tint of blackne . měl-an-ō-phlō'-ģīte, s. [Pref. melano-, and Gr. phlegesthai = to be burnt.] Min.: An isomeric mineral, occurring in minute cubes, with cubic cleavage. Hardne , 6.5 to 7; specific gravity, 2004; color, light brown or colorle ; luster, vitreous. Composition: Silica, 86-29; sulphuric acid, 72; water, 2.86; strontia, 28. Turns black when heated before the blowpipe, hence the name. Regarded as an impure form of silica of po ibly pseudomorphic origin. Found in individual crystals or as a drusy crust on sulphur, celestine, and calcite, at Girgenti, Sicily.