Edouard Bastarache on thu 5 jun 03
Hello Kurt,
its a potash spar.
Later,
"Ils sont fous ces Quebecois"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://perso.wanadoo.fr/smart2000/index.htm
----- Original Message -----
From: Kurt Wild
To:
Sent: Thursday, June 05, 2003 8:09 PM
Subject: Oxford feldspar?
> A glaze recipe calls for Oxford spar can someone tell me if it is a potash
> or soda spar?
>
> Thanks, Kurt
>
> *********************************************
> Kurt Wild
> River Falls, WI
> 54022
>
>
____________________________________________________________________________
__
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G.M. Schauer on thu 5 jun 03
I found it on this site with a Google search:
http://www.matrix2000.co.nz/MaterialsWeb/Materials_O.htm#Oxford%20Feldspar
Galen Schauer
Plymouth, MN
----- Original Message -----
From: "Kurt Wild"
To:
Sent: Thursday, June 05, 2003 7:09 PM
Subject: Oxford feldspar?
> A glaze recipe calls for Oxford spar can someone tell me if it is a potash
> or soda spar?
>
> Thanks, Kurt
>
> *********************************************
> Kurt Wild
> River Falls, WI
> 54022
>
>
____________________________________________________________________________
__
> 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.
>
>
Richard Aerni on thu 5 jun 03
On Thu, 5 Jun 2003 19:09:35 -0500, Kurt Wild wrote:
>A glaze recipe calls for Oxford spar can someone tell me if it is a potash
>or soda spar?
>
>Thanks, Kurt
>
Dear Kurt,
Back on the list, again...
I was struck by your mention of an old friend, Oxford Spar. It got me off
on a tangent of searching my old Studio Potter Magazines, all the way back
to 1974, because I vaguely remember an article there by the owner of the
quarry when he decided to shut down. But, alas, no luck...if someone knows
of it's whereabouts, I'd be interested in hearing about it.
But as to your question...Oxford Spar is indeed a potash spar, but it's
proportion of potash to soda is somewhat lower than many potash spars.
It's ratio of potassium to sodium is 1.59, which puts it somewhere between
Eureka Spar (is that still around?) and Kona A-3. Nevertheless, the common
wisdom is that Custer is an apt substitute, despite it's K-Na ratio of 2.31.
I hope this is an adequate answer to your question. What I'm grateful for
is the excuse you gave me to dive back into those old SP magazines. Gave
me a chance to rediscover what a great read it is, and to see many of my
oldest potter friends as they looked 20-30 years ago. What a treat!
Best,
Richard Aerni
Bloomfield, NY back on the list, through the archives...
Tony Hansen on thu 5 jun 03
Go here:
http://digitalfire.ab.ca/cermat/ceramicmaterials/material.php?id=1103
Then search for custer feldspar and use the line at the top
to click back and forth between them to compare. YOu will notice that
the chemistry is very similar, custer is higher in K2O but
every thing else is almost the same.
-------8<--------
A glaze recipe calls for Oxford spar can someone tell me if it is a potash
or soda spar?
--------
Tony Hansen, Digitalfire Corp.
Kurt Wild on thu 5 jun 03
A glaze recipe calls for Oxford spar can someone tell me if it is a potash
or soda spar?
Thanks, Kurt
*********************************************
Kurt Wild
River Falls, WI
54022
Lily Krakowski on fri 6 jun 03
Oxford Spar is a Potash spar.
K20 7.92
Na20 3.22
Ca0 0.38
Fe203 .09
Al203 17.04
Si02 69.4
This info from a page from an catalog from a supplier who went under a
decade or so ago. KEEP those old analyses pages....
Kurt Wild writes:
> A glaze recipe calls for Oxford spar can someone tell me if it is a potash
> or soda spar?
>
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Roger Korn on fri 6 jun 03
To get Unity Formula:
K2O .688 Al2O3 1.48 SiO2 6.02
Na2O .280
CaO .033
Si/Al = 4.07
Roger
Lily Krakowski wrote:
> Oxford Spar is a Potash spar.
>
> K20 7.92
> Na20 3.22
> Ca0 0.38
> Fe203 .09
> Al203 17.04
> Si02 69.4
>
> This info from a page from an catalog from a supplier who went under a
> decade or so ago. KEEP those old analyses pages....
>
>
>
> Kurt Wild writes:
>
>> A glaze recipe calls for Oxford spar can someone tell me if it is a
>> potash
>> or soda spar?
>>
>
>
>
>
>
> Lili Krakowski
> P.O. Box #1
> Constableville, N.Y.
> (315) 942-5916/ 397-2389
>
> Be of good courage....
>
> ______________________________________________________________________________
>
> 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.
>
--
Roger Korn
McKay Creek Ceramics
In AZ: PO Box 463
4215 Culpepper Ranch Rd
Rimrock, AZ 86335
928-567-5699 <-
In OR: PO Box 436
31330 NW Pacific Ave.
North Plains, OR 97133
503-647-5464
Louis Katz on fri 6 jun 03
Answer at:
http://www.digitalfire.ab.ca/cermat/material/1103.php
On Thursday, June 5, 2003, at 07:09 PM, Kurt Wild wrote:
> A glaze recipe calls for Oxford spar can someone tell me if it is a
> potash
> or soda spar?
>
> Thanks, Kurt
>
> *********************************************
> Kurt Wild
> River Falls, WI
> 54022
>
> _______________________________________________________________________
> _______
> 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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