What shape is a quartz crystal?

________ combine to form crystal structures as magma cool.

Minerals are made up of one or more _________.

A mineral is classified as an ore if it ________________________.

A collector of minerals would want a sample of ___________,

The largest group of rock-forming minerals consists of the _______.

One of the softest minerals is ____________________.

All minerals share the following characteristics EXCEPT that of ____.

All minerals share ____ basic characteristics.

The hardness of quartz is 7. This indicates that quartz will scratch all of the following minerals EXCEPT ____.

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