The New Encyclopaedia Britannica, Volume 12 |
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Page 41
... mineral : see molybdate and tungstate minerals . tungsten ( W ) , also called WOLFRAM , chemi- cal element , an exceptionally strong refractory metal of Group VIb of the periodic table , used in steels to increase hardness and strength ...
... mineral : see molybdate and tungstate minerals . tungsten ( W ) , also called WOLFRAM , chemi- cal element , an exceptionally strong refractory metal of Group VIb of the periodic table , used in steels to increase hardness and strength ...
Page 120
... minerals of the sulfide group . The mineral is bluish black with a red- dish tint . Deposits of the mineral are found in the Sierra de Umango ( for which it is named ) in Argentina ; in the Harz Mountains of Ger- many ; and at ...
... minerals of the sulfide group . The mineral is bluish black with a red- dish tint . Deposits of the mineral are found in the Sierra de Umango ( for which it is named ) in Argentina ; in the Harz Mountains of Ger- many ; and at ...
Page 259
... mineral collectors , however , for their brilliant colours . The structures of the vanadate minerals are complex . Some vanadate minerals contain vanadate tetrahedra ( VO ) , in which four oxy- gen atoms occupy the corners of a tetrahe ...
... mineral collectors , however , for their brilliant colours . The structures of the vanadate minerals are complex . Some vanadate minerals contain vanadate tetrahedra ( VO ) , in which four oxy- gen atoms occupy the corners of a tetrahe ...
Contents
he seemed to have a period of hesitation | 451 |
1966 a film version of Ray Bradburys | 608 |
France and about onethird of the gatherings | 842 |
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