The following pictures are of recent submissions to the Chemical Institute of Canada's National Crystal Growing Contest.

They were photographed by Eric Johnson of Ottawa, Ontario.

Copper sulfate or "Bluestone"

Aluminum potassium sulfate or "Alum"

Alum "contaminated" with chromium

Potassium sodium tartrate or "Rochelle Salt"

Rochelle Salt "contaminated" with copper sulfate

Multiple crystals Rochelle Salt "contaminated" with copper sulfate

For pictures of some naturally produced crystals, go to the Smithsonian Gem and Mineral Collection.