what is 'vermiculite'?

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lyner

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what is 'vermiculite'?
« on: 11/01/2009 09:46:04 »
They use it in horticulture and as insulation. What's it made of?

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Offline Chemistry4me

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what is 'vermiculite'?
« Reply #1 on: 11/01/2009 09:51:51 »
Quote
Vermiculite is a 2:1 clay, meaning it has 2 tetrahedral sheets for every one octahedral sheet. It is a limited expansion clay with a medium shrink-swell capacity. Vermiculite has a high cation exchange capacity at 100-150 meq/100g. Vermiculite clays are weathered micas in which the K+ ions between the molecular sheets are replaced by Mg2+ and Fe2+ cations.
http://en.wikipedia.org/wiki/Vermiculite

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Offline Chemistry4me

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what is 'vermiculite'?
« Reply #2 on: 11/01/2009 09:53:49 »
TYPICAL CHEMICAL ANALYSIS
Element Percent by Weight
SiO2     38-46
AL2O3    10-16
MgO      16-35
CaO      1-5
K2O      1-6
Fe2O3    6-13
TiO2     1-3
H2O      8-16
Other    0.2-1.2

Typical Chemical Formula: (Mg,Ca,K,Fe11)3(Si,AL,Fe111)4O10(OH)2O4H2O

There is even a website about it: http://www.vermiculite.net/

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Offline Andrew K Fletcher

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what is 'vermiculite'?
« Reply #3 on: 11/01/2009 18:09:17 »
makes some nice lightweight fluffy concrete when mixed with 1 part cement 5 parts vermiculite. Used to pack around my log burner which is an insert type
Science is continually evolving. Nothing is set in stone. Question everything and everyone. Always consider vested interests as a reason for miss-direction. But most of all explore and find answers that you are comfortable with

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lyner

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what is 'vermiculite'?
« Reply #4 on: 11/01/2009 21:50:18 »
Cheers for the info chaps.