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Minerals

Horizontales
The tendency of mineral to break along smooth, flat surfaces.
The way a mineral's surface reflects light.
A scientist who studies the Earth & its rocks.
A gemstone.
Used for lead in pencils.
Have been made into axes, spears and arrowhead.
Verticales
Used to rub callusses off feet.
The tendency of mineral to break along irregular surfaces.
Used in toothpaste.
The hardest mineral.
The color of a mineral's powder
A naturally occurring, inorganic solid.