Examlex
Use a proof by cases to show that 27 is not the square of a positive integer.
Halite
A salt mineral (NaCl) generally formed by the evaporation of water; cleaves into cubes and has a distinctive salty taste.
Tetrahedron
A four-sided pyramid, as in a silica tetrahedron.
Soluble
Capable of being dissolved in a solvent, typically referring to substances in liquids.
Mohs Hardness Scale
Consists of ten common minerals ranked in order of increasing relative hardness, from 1 to 10.
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