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What are clays?
What are clays?

Clays are the result of the hydration of feldspar* from granitic rock.

It’s a sedimentary rock composed mainly of hydrated aluminium silicate.

 

* Feldspar is the most important group of minerals in the earth’s crust.

Different types of clays

Chlorite can colour the clay green.
Manganese, magnesium, copper… all metals can colour clay, but especially iron:

Fe+ = yellow clay
Fe++ = red clay
Fe – = green clay

The yellow and red clays come respectively from an increasingly active exposure to air (Fe+, Fe++).
The green clay comes from its formation in the absence of air (Fe -).

Colour is not synonymous with efficiency: for example Montmorillonite, which is a very active clay, can be yellow, pink, green, etc. 

Different types of clays
A material with
the intelligence of Nature
A material with the intelligence of Nature

There are several types of clay: 

 

  • Rare clays (which have formed without being displaced) such as:

o Smectits
o Bentonites
o Montmorillonite
o Halloysitis

These clays have an ADsorbent or ABsorbent (depending on types) capacity. 

Clay is a material endowed with the intelligence of Nature and therefore favourable to life: it fixes by ADsorption what is contrary to it and it gives what is favourable to it by a phenomenon of ion exchange (Smectites and Bentonites) or by ABsorption, i. e. like a sponge (Illites).

  • The other clays:

o Kaolin: white clay of Kao Ling, in China
o Illite: more common clay, also known as “pottery clay”.

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