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Decomposition of wavellite?

Posted by David Parfitt

David Parfitt

Decomposition of wavellite?
May 08, 2008 09:45AM

Registered: 4 months ago
Posts: 24

I have a specimen labelled as decomposing wavellite with variscite from High Down Quarry in Devon (England). Can anyone tell me the products of the decomposition of wavellite?

Many thanks

David

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Łukasz Kruszewski

Re: Decomposition of wavellite?
May 09, 2008 01:42AM

Registered: 2 years ago
Posts: 366

Possibly lower hydrates of Al phosphates, like variscite, senegalite, bolivarite, kribergite??? Or gibbsite??? But these are just speculations, as wavellite seems to be quite stable...

Regards!

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David Parfitt

Re: Decomposition of wavellite?
May 09, 2008 02:42PM

Registered: 4 months ago
Posts: 24

Thanks Lukasz - the product of this "decomposition" is an orange-brown colour, in case that helps to narrow it down further.

Best wishes

David

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Jolyon Ralph

Re: Decomposition of wavellite?
May 09, 2008 03:02PM

Registered: 2 years ago
Posts: 2,570

It's likely a mixture of hydrated Al phosphates and hydroxides - not something that you'd probably be able to assign a mineral identity to.

Jolyon

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