Verm colors

Nan's Nook : Archives : Substrate : Vermiculite : Verm colors
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By Patrick (Valence) on Tuesday, November 06, 2001 - 06:42 am: The Nook

Has anyone noticed any differences is anything with cakes with different colors of verm. I started with brown,black and gold colors. ( mostly black)It was fine grade verm. I bought a new bag which is (I think) medium to large but it is white and beige and gold. Just wondering. Probably isn't any different. (The question is about color not size.)

By Nan (Nanook) on Tuesday, November 06, 2001 - 08:50 am: The Nook

Hydrated laminar magnesium-aluminum-ironsilicate (Thanks Vitti) is a natural occuring mineral and is mined like ore. It is a form of hydrated mica. The pure mineral is glass clear. High grade mica ores (large clear flat crystals) have been used for wood stove view plates, capacitor dielectrics, and insulators for years.

Lower grades of the ore are darker as a result of impurities in the crystals. The type and amount of impurity determines the clarity and color.

"Hydrated" mica contains trapped water in the crystaline structure of the plates. The mica ore is ground and screened, then heated intensely to drive the water off. The result is a "puffing" of the mineral like popcorn.

That is part of the story of Verm.