A valuable rock is a gem.
Jade
yes
gold dust
money although there is one that starts with 'a' and ends in 't'
crack
opal
A gem, jewel (hence the word jewellery).
granite,limestone and slate
it's valuable because we burn it in power plants for energy
Valuable. You were correct.
Jade
The word "valuable" is not a verb; it is an adjective.
coal is a valuble rock mined in Indiana
coal.
valuable
Gems are valuable rocks aren't.
Sulfer and Igneous rock