Lepidolite | Colors the blowpipe flame crimson, from lithia; also | gives the fluorine reaction with microcosmic salt. | Leucite | Some varieties, when treated with cobalt solution, | assume a blue color. | Meerschaum | In the glass bulb frequently blackens and evolves an | empyreumatic odor due to organic matter. When this is | burnt off, it again becomes white, and if moistened | with nitrate of cobalt solution and heated, assumes | a pink color. | Okenite | Behaves as Apophyllite. | Olivine | Some varieties give off fluorine, when fused with | microcosmic salt. | Pectolite | Similar to Apophyllite. | Petalite | Imparts a slight crimson color to the flame, like | Lepidolite. | Prehnite | As Chabasite. | Pycnite | Assumes a blue color, when treated with nitrate of | cobalt. Gives the fluorine reaction with microcosmic | salt. | Pyrope | Gives the chromium reaction with borax and microcosmic | salt. | Scolecite | Similar to Laumonite, but more marked. | Scapolite | Occasionally contains a small quantity of lithia, and | colors the flame red when fused with fluorspar and | bisulphate of potassa. | Sodalite | If mixed with one-fifth its volume of oxide of copper, | moistened to make the mixture cohere, and a small | portion placed upon charcoal and heated with the blue | oxidizing flame, the outer flame will be colored | intensely blue from chloride of copper. | | Spodumene | When not too strongly heated, colors the blowpipe | flame red, when more strongly, yellow. | Stilbite | As Chabasite. | Topaz | When heated, remains clear. Otherwise as Pycnite. | Tourmaline | Gives the boracic acid reaction with flourspar and | bisulphate of potassa. | Wollastonite | Colors the blowpipe flame faintly red from lime. | Zircon | The colored varieties become white or colorless and | transparent, when heated. Is only slightly attacked | by carbonate of soda. ______________|________________________________________________________ * * * * * URANIUM. * * * * * Mineral. Pitchblende Formula. [.U][...U=] essentially. Behavior (1) in glass-bulb. Evolves some water and a small quantity of sulphur, sulphide of arsenic and metallic arsenic.