Snail Scott on tue 14 nov 00
Fluorite is the mineral name of fluorspar: CaF2. It is
sometimes used as a flux in glass enamels, or as a
component in frits. Rather squirrely to use in glazes,
according to Hamer&Hamer.
Silicon dioxide is the mineral name of quartz, the same
as what we call plain old silica: SiO2.
Coprolite is the scientific term for fossilized shit.
I know of no standard mineral analysis, and I have no
idea what use it might have in ceramics.
-Snail
At 05:19 PM 11/14/00 -0600, you wrote:
>Our Potter's Guild inherited some chemicals and we cannot find any
>information on them. Can anyone help? Silicon dioxide,coprolite and fluorite
>are the unknowns. We also were given frits that are in the 3400 range. One
>potter has claimed that they are okay to use- we do not use any lead
>containing recipes so some of us feel that these should be discarded
>(safely!). Is there any situation where a lead containing frit is safe???
>Thank you for your help - I have checked all our books and "oldtime" potters
>with no success.
>
>___________________________________________________________________________
___
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
T. Howard on tue 14 nov 00
Our Potter's Guild inherited some chemicals and we cannot find any
information on them. Can anyone help? Silicon dioxide,coprolite and fluorite
are the unknowns. We also were given frits that are in the 3400 range. One
potter has claimed that they are okay to use- we do not use any lead
containing recipes so some of us feel that these should be discarded
(safely!). Is there any situation where a lead containing frit is safe???
Thank you for your help - I have checked all our books and "oldtime" potters
with no success.
Fredrick Paget on tue 14 nov 00
Oh, this is an easy one - Coprolite indeed. Somebody was trying to be
funny. Webster says it is petrified dung, a fossilized excrement. I would
throw that one away. Probably a nice way of labeling some junk.
Silicon dioxide is of course silica and fluorite is correctly labeled but
I don't think you will have much use for it.
Fred Paget
>Our Potter's Guild inherited some chemicals and we cannot find any
>information on them. Can anyone help? Silicon dioxide,coprolite and fluorite
>are the unknowns. We also were given frits that are in the 3400 range. One
>potter has claimed that they are okay to use- we do not use any lead
>containing recipes so some of us feel that these should be discarded
>(safely!). Is there any situation where a lead containing frit is safe???
>Thank you for your help - I have checked all our books and "oldtime" potters
>with no success.
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
>melpots@pclink.com.
>From Fred Paget, Marin County, California, USA
Martin Howard on wed 15 nov 00
Coprolite is fossil excreta. DON'T throw it away. It should be a good
material in a glaze, mainly SiO2 (silica), with some CaCo3(calcium
carbonate) plus interesting additions. Why not have it analysed? May be from
dinosaurs with included dna.
Suggest you mix it well with Cat Litter :-)
Martin Howard
Webb's Cottage Pottery
Woolpits Road, Great Saling
BRAINTREE, Essex CM7 5DZ
England
martin@webbscottage.co.uk
Diane G. Echlin on wed 15 nov 00
> Coprolite is the scientific term for fossilized shit.
> I know of no standard mineral analysis, and I have no
> idea what use it might have in ceramics.
>
> -Snail
Maybe i can throw it at the speeders on my street as an alternative to shards of
seconds on the roadway!
Diane in CT
Snail Scott on wed 15 nov 00
During the fossilization process, most or all of the organic matter
will have been replaced by minerals of varying sorts, depending on
the location and circumstances of deposition. Probably got some calcium,
silica, and other trace minerals. Could be interesting, though not
reproducible. I think you should test it out, and tell us all about it!
(When you talk about "that crappy glaze", you'd really mean it!)
-Snail
At 04:38 PM 11/15/00 -0500, you wrote:
>> Coprolite is the scientific term for fossilized shit.
>> I know of no standard mineral analysis, and I have no
>> idea what use it might have in ceramics.
>>
>> -Snail
>
>Maybe i can throw it at the speeders on my street as an alternative to
shards of
>seconds on the roadway!
>Diane in CT
>
>___________________________________________________________________________
___
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
Chris Schafale on thu 16 nov 00
Could it be that "coprolite" is really "cryolite"?? That would make a
whole lot more sense. Cryolite is sodium aluminum fluoride.
Hamer/Hamer says it is one of the few natural sodium compounds
that is insoluble in water, and that it is used in crater glazes and to
produce crackle effects in alkaline glazes. I seem to recall some
discussion that suggested cryolite might be damaging to electric
kilns, however. Check the archives on this one.
Chris
>
> >Our Potter's Guild inherited some chemicals and we cannot find any
> >information on them. Can anyone help? Silicon dioxide,coprolite and fluorite
> >are the unknowns. We also were given frits that are in the 3400 range. One
> >potter has claimed that they are okay to use- we do not use any lead
> >containing recipes so some of us feel that these should be discarded
> >(safely!). Is there any situation where a lead containing frit is safe???
> >Thank you for your help - I have checked all our books and "oldtime" potters
> >with no success.
> >
> >______________________________________________________________________________
> >Send postings to clayart@lsv.ceramics.org
> >
> >You may look at the archives for the list or change your subscription
> >settings from http://www.ceramics.org/clayart/
> >
> >Moderator of the list is Mel Jacobson who may be reached at
> >melpots@pclink.com.
>
>
> >From Fred Paget, Marin County, California, USA
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
ARTISTINSC@AOL.COM on sat 18 nov 00
there was a bag shortage in the late 70s and early 80s and the werting may
have no relation yo the actual ibgredients. i have gerstley borate in bags
marked plaster from that era.
margaret
Milton Markey on sat 18 nov 00
Hi Everybody!
I've been reading the posts to this thread with great interest. Thanks for
the thoughts about what the mystery material might be.
I wonder, however, if the word on the bag is misspelled, and the substance in
question might actually be something else?
I checked A Field Guide To Rocks and Minerals, a Peterson Field Guide, and
came up with a couple similarly-spelled minerals or compounds.
One is copiapite, an iron-based mineral. Another might be cuprite, a
secondary ore of copper.
I suggest that one takes a sample of an unknown compound to a nearby
university chemistry lab, and have the sample tested. That way, one can be
certain of the substance's identity.
Best wishes!
Milton NakedClay@AOL.COM
David Hewitt on mon 20 nov 00
If you do have bags of materials and are not sure of the contents, you
may like to look at the suggested testing procedure given under
'Unlabelled Bags & Buckets' on my web site
http://www.dhpot.demon.co.uk
David
In message , ARTISTINSC@AOL.COM writes
>there was a bag shortage in the late 70s and early 80s and the werting ma=
>y
>have no relation yo the actual ibgredients. i have gerstley borate in ba=
>gs
>marked plaster from that era.
>margaret
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Web site http://www.dhpot.demon.co.uk
Snail Scott on thu 23 nov 00
Coprolite is fossilized; no remaining organic matter (noncombustible).
Of course, it does smell better!
-Snail
At 12:36 PM 11/23/00 EST, you wrote:
> MAYBE IT IS USED FOR PIT FIRIND AS THE NATIVE AMERICANS USE COW PATTIES AND
>SUCH.
>In a message dated 11/15/00 12:29:20 AM Eastern Standard Time,
>fredrick@WELL.COM writes:
>
>
>>
>> Oh, this is an easy one - Coprolite indeed. Somebody was trying to be
>> funny. Webster says it is petrified dung, a fossilized excrement. I would
>> throw that one away. Probably a nice way of labeling some junk.
>> Silicon dioxide is of course silica and fluorite is correctly labeled but
>> I don't think you will have much use for it.
>>
>> Fred Paget
>>
>> >Our Potter's Guild inherited some chemicals and we cannot find any
>> >information on them. Can anyone help? Silicon dioxide,coprolite and
>> fluorite
>> >are the unknowns. We also were given frits that are in the 3400 range. One
>> >potter has claimed that they are okay to use- we do not use any lead
>> >containing recipes so some of us feel that these should be discarded
>> >(safely!). Is there any situation where a lead containing frit is safe???
>> >Thank you for your help - I have checked all our books and "oldtime"
>> potters
>> >with no success.
>> >
>> >
>>
>>
>>
______________________________________________________________________________
>> >Send postings to clayart@lsv.ceramics.org
>> >
>> >You may look at the archives for the list or change your subscription
>> >settings from http://www.ceramics.org/clayart/
>> >
>> >Moderator of the list is Mel Jacobson who may be reached at
>> >melpots@pclink.com.
>>
>>
>> From Fred Paget, Marin County, California, USA
>>
>>
>>
>>
______________________________________________________________________________
>> Send postings to clayart@lsv.ceramics.org
>>
>> You may look at the archives for the list or change your subscription
>> settings from http://www.ceramics.org/clayart/
>>
>> Moderator of the list is Mel Jacobson who may be reached at
>> melpots@pclink.com.
>>
>>
>>
>>
>
>___________________________________________________________________________
___
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
ARTISTINSC@AOL.COM on thu 23 nov 00
MAYBE IT IS USED FOR PIT FIRIND AS THE NATIVE AMERICANS USE COW PATTIES AND
SUCH.
In a message dated 11/15/00 12:29:20 AM Eastern Standard Time,
fredrick@WELL.COM writes:
>
> Oh, this is an easy one - Coprolite indeed. Somebody was trying to be
> funny. Webster says it is petrified dung, a fossilized excrement. I would
> throw that one away. Probably a nice way of labeling some junk.
> Silicon dioxide is of course silica and fluorite is correctly labeled but
> I don't think you will have much use for it.
>
> Fred Paget
>
> >Our Potter's Guild inherited some chemicals and we cannot find any
> >information on them. Can anyone help? Silicon dioxide,coprolite and
> fluorite
> >are the unknowns. We also were given frits that are in the 3400 range. One
> >potter has claimed that they are okay to use- we do not use any lead
> >containing recipes so some of us feel that these should be discarded
> >(safely!). Is there any situation where a lead containing frit is safe???
> >Thank you for your help - I have checked all our books and "oldtime"
> potters
> >with no success.
> >
> >
>
>
> ______________________________________________________________________________
> >Send postings to clayart@lsv.ceramics.org
> >
> >You may look at the archives for the list or change your subscription
> >settings from http://www.ceramics.org/clayart/
> >
> >Moderator of the list is Mel Jacobson who may be reached at
> >melpots@pclink.com.
>
>
> From Fred Paget, Marin County, California, USA
>
>
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>
>
>
>
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