How does material which don't have any chemical content OR no chemical used during its manufacturing but is a permanent building material, comply with credit? For example Granite OR marble, these material don't have any chemicals.

Other material such as red clay bricks (kiln heated), natural hardwood or aggregate, sand, etc.? Also, why would the manufacture will carry out costly chemical assessment in the event when he know that his materials are naturally occurring and don't have any harmful chemical in it?