luster: The way light bounces off a mineral's surface.
streak: The color of the powder left when a mineral is rubbed against a hard, roungh surface.
hardness: How well a mineral resists scratching.
cleavage: The tendency of a mineral to break along flat surface.
ore: A mineral containing a useful substance.
gem: A mineral valued for baing rare and beautiful.
nonrenewable resource: A resource that cannot be replaced within a short period of time or at all.
No hay comentarios:
Publicar un comentario