There are many ways to make crystals from scratch.
All salts make crystals.
what do you need to make a borax crystals
to make crystals grow
Sure, because crystals make rainbows.
watersalt
do sugar crystals form on straws
Blizzard conditions would make photographing snow crystals difficult.
There are different minerals in different crystals which make them different colors. And "imperities"
It's not that only alum makes big crystals.. There are so many compounds that can make big crystals. Even Sodium Hydroxide makes very good and big crystals. For crystals you need a uniform arrangement of atoms in space. For big crystals all you need is patience. The slower is the crystallization process the bigger crystals are formed. What industries do is called seeding. They make a good concentrated solution of the compound whose crystals are needed and then they put a crystal of the same compound in the solution. The new crystals form and attach to the crystal making quick and big crystals.
watersalt
Yes. Different kinds of salt can make different kinds of crystals
There are different minerals in different crystals which make them different colors. And "imperities"