Pleased to be of assistance.
Can New Listers also be Lurkers? If so, I've found a new calling.
Deborah
At 07:06 PM 11/11/2008, you wrote:
>Mr. West, I presume,
>My goodness. Seems these new listers are true catalysts. Lurkers unite!
>What have you been up to?
>Cheers,
>Leland
>
>-----Original Message-----
>From: The listserv where the buildings do the talking
>[mailto:[log in to unmask]] On Behalf Of David West
>Sent: Tuesday, November 11, 2008 6:50 PM
>To: [log in to unmask]
>Subject: Re: [BP] New (maybe) Thread
>
>Personally, I like the term 'fubrite' ...
>
>David West
>Executive Director
>internationalconservationservices
>T: +61 (2) 9417 3311
>M: +61 (411) 692 696
>sustaining your heritage
>
>-----Original Message-----
>From: The listserv where the buildings do the talking
>[mailto:[log in to unmask]] On Behalf Of John Walsh
>Sent: Wednesday, 12 November 2008 10:29 AM
>To: [log in to unmask]
>Subject: Re: [BP] New (maybe) Thread
>
>Wow, you're all getting into a lot more detail than I'd think anyone
>would
>be interested in knowing about. But yes, slates are compressed and
>heated
>shales (or better yet clastic rocks...geologists see a lot of gray area
>since all we're really talking about in these definitions is grain size
>and
>what has happened since the muck was deposited). Imagine a few hundred
>feet
>of nicely horizontal beds of mud and silt and then picture a continent
>slamming into those beds. There's a great deal of heat and the
>constituent
>minerals begin to recrystallize. Clays become fine-grained micas.
>However,
>these new platy minerals orient themselves at a high angle to the
>direction
>of the compression. This is what produces the cleavage or rift in a
>slate.
>If you look closely at some slates you will often see a faint banding
>across
>the split face. This is the original bedding orientation that is now at
>an
>angle to the rift. It's best observed when there are sandier layers
>present. If you get a little hotter and squishier the slates will first
>become something called a phyllite, then a schist, then finally a gooey
>mess.
>
>And if you think cleavage, hardness, graywacke and schist are funny, you
>can
>imagine the giggling in mineralogy class when the professor first
>introduced
>the mineral "cummingtonite". I schist you not.
>
>John
>
>-----Original Message-----
>From: The listserv where the buildings do the talking
>[mailto:[log in to unmask]] On Behalf Of Gabriel
>Orgrease
>Sent: Tuesday, November 11, 2008 6:12 PM
>To: [log in to unmask]
>Subject: Re: [BP] New (maybe) Thread
>
>John Walsh wrote:
> > Slates are recrystallized rocks
>due to compression?
>
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Deborah Mills Woodcarving
new address:
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