From:
"Scott Engering" <Scott@xxxxxxxxxxxxxxxxxxxxx>
Date:
Tue, 6 Mar 2001 22:45:19 -0000
Subject:
What makes marble hard or soft?
I could not have answered the question in such a succinct form if I had
tried! I had thought about a reply, but I know now that there is no point in
pretending that my particular skill is in microscopic petrology.
However, I must say that a distinction must be made between 'true marbles'
which are limestones (calcium carbonates) subjected to extremely high
pressures and temperatures, which deserve their name "Metamorphic Rocks" and
those limestones which are merely termed 'marbles' by the 'trade' because of
their very hard and resistant nature and take a very high and attractive
polished finish.
I don't know about any kind of Alaskan marbles, because I have never had the
privelage to study the rocks of abroad, except those of Italy, where true
marbles abound. Even so, real marble does not like to be kept out in the
open, wet and windy air!
Regards
Scott Engering
----- Original Message -----
Quoted text begins.From: Tim Palmer
The sizes of the individual calcite crystals, the extent to which they are
tightly intergrown within the rock, the residual porosity, and the
percentage of impurities all contribute.
End of quote.
- References
- message 00822: Cracks in soapstone - Andrei Stefanescu (06 Mar 2001)
- message 00826: Working with soapstone - BROTHERS TRADING CORPORATION. PAKISTAN. (05 Mar 2001)
- message 00816: What makes marble hard or soft? - Tim Palmer (06 Mar 2001)
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