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Inside the Restless Earth

Across
The smallest part of an element that has all the properties of that element.
The way the surface of a mineral reflects light.
The tendency of a mineral to break along flat surfaces.
A pure substance that cannot be separated or broken down into simpler substances by ordinary chemical means.
A mineral that does not contain compounds of silicon and oxygen.
The resistance of a mineral to being scratched.
The solid, geometric form of a mineral produced by a repeating pattern.
Down
The tendency of a mineral to break along curved or irregular surfaces.
A naturally formed, inorganic solid with a crystaline structure.
A mineral that contains a combination of the elements silicon and oxygen.
The amount of matter in a given space; mass per unit volume.
A pure substance made of two or more elements that have been chemically joined, or bonded together.
The color of a mineral in powdered form.