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Essential minerals can give rocks their names: ferromagnesian minerals contain this &/or magnesium |
iron
|
$1,200 |
DJ |
KNOW YOUR EARTH |
2006-06-12 |
#5021 |
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"Cast" in the role of the fourth most abundant element in the Earth's crust, its atomic number is 26 |
iron
DD
|
$9,000 |
DJ |
DOWN TO EARTH |
2005-11-25 |
#4880 |
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In 1952 Francis Birch showed that the center of the Earth is basically this metal in molten form |
iron
|
$1,000 |
J |
THE REAL MIDDLE EARTH |
2003-07-14 |
#4361 |
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The inner core of the Earth is thought to be a solid ball composed mainly of nickel & this metal |
iron
|
$300 |
J |
THE EARTH |
1993-01-19 |
#1932 |