melano psis

[Pref. mel an-, and Gr. ops is =the face, the visage.] Zool.: A genus of holostomatous gasteropods, family Melaniade. The last whorl is elongated; the spire is short and pointed, inner lip thickened; operculum sub-spiral. Twenty species are known, from Spain, Austria, Asia Minor, and New Zealand. IMG:content-1077.png:[blocks in formation] IMG:content-1078.png:[blocks in formation] melanth mē-lăn-o-scope, s. [Gr. melanos =black, and skopeo to see.] Optics: An instrument for detecting the presence of certain salts or elements in burning substances by means of lenses so arranged as to make ali others but red lights appear black. měl-an-o-sid-er-ite, s. [Pref. melano-, and Eng. siderite (q.v.)=iron.] Min .: Amorphous, compact. Hardne , 45; specific gravity, 3'391; luster, vitreous to resinous; color, black; streak, brownish to brick-red; gelatinizes with acids. Supposed to be a hydrated silicate of sesquioxide of iron and alumina, but regarded by some mineralogists as limonite (q. v.), the silica being an impurity. Found at Mineral Hill, Delaware Co., Pennsylvania.