Unlike alluvial gold, which is found as very small flakes on riverbanks, gold-bearing rocks have to be dug out ... is a physical mixture of metals, or a type of alloy. Using mercury is a pretty ...

An Australian metal detectorist named David Hole made an extraordinary discovery that intrigued scientists and captivated the ...

Large crystals found in geodes and other rocks are relatively rare. Pink ChalcedonyA pink chalcedony shows off its beauty. Chalcedonies include many types of ... such as gold, tin, iron, marble ...