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Octahedral crystals of iron alum, thallium alum, rubidium alum, caesium alum, ammonia alum, potash alum and chrome alum.

Octahedral crystals of various alums

Octahedral crystal of iron alum.

Octahedral crystal of iron alum.

Octahedral crystal of thallium alum.

Octahedral crystal of thallium alum.

Octahedral crystal of rubidium alum.

Octahedral crystal of rubidium alum.

Octahedral crystal of chrome alum.

Octahedral crystal of chrome alum

Octahedral crystal of caesium alum.

Octahedral crystal of caesium alum.

Octahedral crystal of potash alum.

Octahedral crystal of potash alum.

Octahedral crystal of ammonia alum.

Octahedral crystal of ammonia alum.