These clay powders orinate right here in Australia. The different clays have different benefits and are suitable to different skin types.
A google search will reveal more detailed information. In brief White - Sensitive, Yellow - Mature, Pink - Combination, Green - Oily, Red - Acne.
These a packed by volume not by weight. Typically the darker the clay the heavier it is. Ie WHite 50grams versus Red 70grams.