MINIUM. 219 FIG. 225. FIG. 226. FIG 227. Cleavage, o, a distinct. Fracture conch oidal. Translucent on the edges. Lustre adamantine. "When pure colourless, usually red, inclining to yellow. Streak orange-yellow. Brittle, u = 4-0...4-5. G = 5'43.. .6'63. . . ’ . Before the blowpipe phosphoresces strongly; is infusible. On charcoal with soda yields a sublimate of zinc. With borax and salt of phosphorus yields the reaction of manganese. Soluble without effervescence in nitric acid. When exposed to the air becomes dull and coated with a white crust. . Zn, zinc 80'2fl, oxygen 19'74. Analyses a of granular spartalite disseminated in franklinite from New Jersey, b of eleavable spartalite associated with mag netite from Sterling, both by Whitney; c by Hayes ;— Oxide of zinc . . Oxide of manganese Franklinite . , . Loss by ignition Is found in beds with franklinite and calcite in the Franklin, Sterling and Itutger’s iron mines in Sussex county in New Jersey, and near Sparta. It has also been found distinctly crystallized in iron and zinc furnaces. The form r was observed by Descloiseaux in crystals of oxide of zinc formed in cavities in roasted blende; x w'as observed in some artificial crystals obtained from Professor Wohler, and by Levy in crystals formed by sublimation ; v was observed by Hn.imnin.nn and Koch in crystals formed in iron furnaces. a b c 94-45 96-19 93-48 trace 3-70 Mn 5-50 449 Fein 010 ft 0-36 1-09 — hematite 0-44 107. MINIUM.—Native minium; Phillips. Plomb oxide rouge; lluuy. Memiige; Hausmann, Ilaidinger. Fracture earthy, even, flat conehoidal. Opaque. Lustre i 2
