gold leaf clumped on black background

mineralogy raw processed rolled specks flakes nugget mined mining rare earths element elemental geology geological metal standard monetary policy insurance inflation barter currency value increasing decreasing covet jewelry 24 twenty four carat 14 fourteen 10 jeweler chemical physical properties identification id metalworking alloyed alloy gemologist gemology malleable oxidizing touchstone testing noble metalwork metalsmith isolated object everyday bank banking historical natural inorganic