= Minerals =

A mineral is a solid, inorganic substance of natural occurrence.

== Identification ==

Properties of a mineral can be used to determine what it is, including

* color
* hardness
* density
* luster
* fractures/cleavage
* magnetic

=== Hardness ===

Moh's hardness scale is a relative scale to measure how hard a mineral is

* 1 - talc
* 2 - gypsum
* 2.5 - fingernail
* 3 - calcite
* 7 - quartz
* 10 - diamond