Alum Crystals Photo Gallery

Alum Crystal

This is a single alum crystal.
This is a single alum crystal. The shape of the crystal is the most common form taken by alum crystals grown under ordinary household conditions. Todd Helmenstine

Alum is a kitchen ingredient that can be grown as crystals simply by mixing alum in boiling water until no more will dissolve. Here are examples of different alum crystals.

Alum Crystals

Alum crystals are popular crystals to grow.
Alum crystals are popular crystals to grow because the ingredient may be purchased at the grocery store and the crystals only take a few hours to grow. Todd Helmenstine

Potassium Alum Crystal

This is a crystal of potassium alum or potash alum.
This is a crystal of potassium alum or potash alum. Food coloring was added to these crystals, which are clear when the alum is pure. Anne Helmenstine

Chromium Alum Crystal

This is a crystal of chrome alum, also known as chromium alum.
This is a crystal of chrome alum, also known as chromium alum. The crystal displays the characteristic purple color and octohedral shape. Ra'ike, Wikipedia Commons

Alum Crystal Pyramid

Alum crystals can be found in a few different shapes. This is an alum crystal pyramid.
Alum crystals can be found in a few different shapes. This is an alum crystal pyramid. Anne Helmenstine

Alum Crystal

This is a crystal of alum, a kitchen spice.
This is a crystal of alum, a kitchen spice. Alum crystals are easy to grow and can become quite large. Anne Helmenstine

Glowing Alum Crystals

These easy-to-grow alum crystals glow in the dark.
These easy-to-grow alum crystals glow, thanks to the addition of a little fluorescent dye to the crystal growing solution. Anne Helmenstine

Alum Crystals

In the Smithsonian kits, these are called 'frosty diamonds'.
In the Smithsonian kits, these are called 'frosty diamonds'. The crystals are alum on a rock. Anne Helmenstine

Alum Crystal After One Day

You usually can get a nice alum crystal overnight.
You usually can get a nice alum crystal overnight. If you let the crystal grow for a day or more, you can get larger crystals. Anne Helmenstine

Alum Crystal

Alum crystals are probably the easiest crystals to grow.
Alum crystals are probably the easiest crystals to grow. The chemical is non-toxic and the crystals grow quickly and reliably. Anne Helmenstine

Alum Crystal

This alum crystal grew overnight.
This alum crystal grew overnight. Anne Helmenstine

Aluminium Potassium Sulfate Crystal

This is a large crystal of alum, or aluminium potassium sulfate.
This is a large crystal of alum, or aluminium potassium sulfate. wikipedia.org