The National Geographic Magazine, Volume 100National Geographic Society, 1952 - Geography Indexes kept up to date with supplements. |
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Page 631
Rockhounds ” Uncover Earth's Mineral “ Beauty BY GEORGE S. SWITZER Associate Curator of Mineralogy , U. S. National Museum Y EARS ago when I first became a " rock- replaced , cell by cell , with some mineral dishound , " a friend and I ...
Rockhounds ” Uncover Earth's Mineral “ Beauty BY GEORGE S. SWITZER Associate Curator of Mineralogy , U. S. National Museum Y EARS ago when I first became a " rock- replaced , cell by cell , with some mineral dishound , " a friend and I ...
Page 642
When Others prefer to make faceted stones , those struck with a hammer , this mineral procut with a large number of flat faces ( page duces a highly unpleasant odor , reported 655 ) , such as the familiar brilliant - cut dia- to have ...
When Others prefer to make faceted stones , those struck with a hammer , this mineral procut with a large number of flat faces ( page duces a highly unpleasant odor , reported 655 ) , such as the familiar brilliant - cut dia- to have ...
Page 644
Deposits on the Malay Peninsula are mineral is unique among ores because the the world's richest . * processing of it yields nearly one - third more Quartz , oxide of silicon , is the second most borax simply by adding water .
Deposits on the Malay Peninsula are mineral is unique among ores because the the world's richest . * processing of it yields nearly one - third more Quartz , oxide of silicon , is the second most borax simply by adding water .
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