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"Crystal" is a loose term, meaning anything that has a continuously repeating atomic structure. Ice is in fact a crystal.

All minerals form crystals. Different minerals require different environments to form. For example, diamond is a crystal of carbon, but needs extremely high pressures and temperatures found deep within the earth (~100km) to be able to crystalise. If the pressure is not high enough, it will form graphite, the dull gray material in a pencil.

Other minerals only form crystals at very low temperatures and pressures. For example, water ice (which is a mineral in its crystal form) must be at or below 0 degrees at 1 atmosphere, lower temperatures at higher pressures, to crystalise.

The slower a crystal forms, the "better" it will be. Large crystals with nice flat faces for example will usually only grow if allowed to do so very slowly with minimal physical disturbance.

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