The Age and Shape of Diatoms
Each deposit of diatomaceous earth is different, with varying blends of pure diatomaceous earth combined with other natural clays and minerals.
The diatoms in each deposit contain different amounts of silica, depending on the age of the deposit. As well, the species of diatom may also differ among deposits.
The species of diatom is dependent upon the age and paleo-environment of the deposit. In turn, the shape of a diatom is determined by its species.
The shape of the diatoms contained in a deposit has not been proven to affect their functionality when it comes to the absorption of liquids, however certain applications, such as that for slugs and snails, do work best when a particular shaped diatom is used. For example, in the case of slugs and snails large, spiny diatoms work best to lacerate the epithelium of the mollusk. Diatom shells will work to some degree on vast majority of animals that undergo ecdysis in shedding cuticle, such as arthropods or nematodes. It may have some effect also on lophotrochozoans, such as mollusks or annelids.
Many deposits throughout British Columbia, Canada, such as Red Lake Earth, are from the Miocene age and contain a species of diatom known as Melosira granulate. These diatoms are approximately 12 to 13 million years old and are a small globular shape.
A deposit containing diatoms from this age can provide many more benefits than that of an older deposit. For example, diatoms from the Eocene age (approximately 40 to 50 million years old) are not as effective in their ability to absorb fluids because older diatoms such as this recrystallize, their small pores becoming filled with silica.
Read more about this topic: Diatomaceous Earth
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