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Author Topic: what is 'vermiculite'?  (Read 2176 times)

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?


 

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
 

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/
 

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
 

lyner

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

The Naked Scientists Forum

what is 'vermiculite'?
« Reply #4 on: 11/01/2009 21:50:18 »

 

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