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Hardness is a measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied.

http://withfriendship.com/images/i/44812/Mohs-scale-of-mineral-hardness-picture.jpg

Teacher has used Cobocards for students to learn vocabulary words.

the manner in which the surface of a mineral reflects light.

http://mocoloco.com/archives/005165.php

a solid inorganic substance of natural occurrence

http://commons.wikimedia.org/wiki/File:Fluorescent_minerals_hg.jpg

a long, thin line or mark of a different substance or color from its surroundings.

http://www.geevor.com/index.php?object=315