Show i t The Properties of Radium Prospectors who wish turn torn to attention attention at at- to radium one of the most moat precious metals known may get some pointers from the following article t from the Colorado School of mine miner Pitch Pitchblende blonde occurs occur In ire veins In Igneous rocks like granite It Is Ja valued for Its Us uranium and radium ti contents contenta It L is not found in sedimentary l tar tary rocks like tand oland stone atone although A alteration products as it ft may be found therein Such alteration products are Bre colored yellow or greenish and when In sufficient concentration and r quantity are valuable for their uranIum uranium uran uran- ium um contents The radium value inIs in inis is small as a rule Pitchblende is found in vein matter in stringers varying from thickness to several inches It is bunch bunchy The associated minerals In addition to vein matter are sulphides sulphides sulphides sul sul- such as zinc blende blonde galena and iron pyrite The latter usually predominates It is detected in I these streaks by the tho following properties properties properties prop prop- Color Pitch black velvety black c brownish sometimes with lith a grayish or greenish cast The he streak on rough roughs porcelain i. i e. e the edge of a r broken plate is s brownish black olive green or grayish Luster Dull metallic greasy Fracture that is with with'S I S I smooth curved surfaces to uneven Brittle less than quartz It is not scratched b by a unless weathered Specific Gravity Heavier than iron or s steel eel also heavier than galena The following common minerals are likely to be mistaken for pitchblende b by pt prospectors Obsidian or Volcanic Glass which differs from pitchblende in its lightness lightness light light- ness glassy luster and light streak Magnetite l which differs mainly in that it is attracted by the magnet Hematite which differs from pitch- pitch blend mainly in possessing a n. red J streak i 0 |