|
A placer is a deposit of sand containing metals such as this, which brought an influx to Placer County, California |
gold
|
$400 |
DJ |
GEOLOGY |
2006-11-24 |
#5110 |
|
Named for its inventor, Pinchbeck is a zinc-copper alloy used on metal to imitate this |
Gold
|
$500 |
J |
THEY CAN'T ALL BE GEMS |
1998-03-09 |
#3121 |
|
This precious metal & platinum are among the heaviest minerals, which is why they settle well in streams |
gold
|
$200 |
DJ |
ROCKS & MINERALS |
1991-02-18 |
#1496 |
|
Pyrite contains both sulfur & iron but only a "fool" thinks it contains this |
gold
|
$300 |
J |
MINERALS |
1988-05-23 |
#871 |