STONES

	stone soup
	cast in stone
	Can't get blood out of a stone
	stone cold sober
	have a heart of stone
	A rolling stone gathers no moss.
	stone dead
	leave no stone unturned
	Sticks and stones may break my bones but words will never hurt me.
	sink like a stone
	kill two birds with one stone
	He who lives in glass houses shouldn't throw stones
	a stone's throw away

ROCKS

	as solid as a rock
	between a rock and a hard place
	be on the rocks
	rock bottom

MINERALS

	GOLD as good as gold worth your weight in gold a gold digger All that glitters is not gold. have a heart of gold
	SALT rub salt into the wound be the salt of the earth any person worth their salt take something with a pinch of salt
	CRYSTAL crystal clear
	SILVER Every cloud has a silver lining. be born with a silver spoon in your mouth give someone something on a silver platter silver-tongued
	LEAD Go down like a lead balloon.
	BRASS as bold as brass the brass ring get down to brass tacks the top brass Where there's muck, there's brass.

	http://www.funbrain.com/idioms/ A site with games about expressions & idioms
	http://idioms.thefreedictionary.com/
	http://www.idiomsite.com/
	http://www.geocities.com/Athens/aegean/6720/