you can hammer it into a thin sheet

or shapable

waste rock that you put some

place you don't want to erode

igneous rocks are the only rocks that

start out...

sedimentary rocks have ____ or ____

origins

chemical: precipitation or evaporation

or 

organic

pieces

small pieces like shale

big pieces like sandstone

gold

diamonds

silver

platinum

etc.

• soft
• carat: weight
• karat: purity - #/24 = % gold
• can be alloyed with silver for strength
• high specific gravity
• can be pounded into sheets (gold leaf)
• panning
• drenching: mechanized panning
• inactive chemically
• symbol: AU

uses?  space industry, message to taurus,

arthritis shots, base for money

piezoelectricity: conductor of electricity 

• pure carbon changes under great pressure
• adamantine: sparkles like a diamond
• origin: man made in 1954
• 90 to 100 miles down, diamond pipes
• kimberlite: diamond ore
• In Fort Collins, Arkansas
• Earliest diamonds found in India
• Largest: star of Africa - 22 oz
• Hope diamonds - 45c, cursed ;)
• bort: non gem quailty

• silverware is expensive
• silver standard was considered
• used to be used in photography
• leadville, CO has galena and silver
• Keystone, CO - silver bullet story

• dull looking silver
• practical uses:
• catalyst in industry
• common in the auto industry
• catalytic convertor