Why do all quartz crystals not grow large beautiful crystals?

Question

Why do all quartz crystals not grow large beautiful crystals?

Answer 1

Because of the different environments in which they grew. For a large perfectly formed quartz crystal to form, sufficient space needs to be available for crystal growth and adequate dissolved silica must be available in the magma or hydrothermal fluids.

Answer 2

Combination of space and rate of formation variations affect the size, crystallinity, and purity of pretty well all minerals.

Answer 3

It depends upon how much materials are present, the temperature of the molten material and how fast the material cools.