Cindy on thu 1 may 97
JB,
According to Insight, here is the analysis for Custer feldspar
K2O 0.01
NaO2 0.01
Fe2O3 0.01
TiO2 0.03
Al2O3 1.00
SiO2 2.03
Hope this helps.
Cindy Strnad
Custer, SD
Ron Roy on fri 2 may 97
>----------------------------Original message----------------------------
>JB,
>
>According to Insight, here is the analysis for Custer feldspar
>
>K2O 0.01
>NaO2 0.01
>Fe2O3 0.01
>TiO2 0.03
>Al2O3 1.00
>SiO2 2.03
>
>Hope this helps.
>
>Cindy Strnad
>Custer, SD
Excuse me for barging in here but the above is not the right formula for
Custer.
I have checked three sources, Foresight, The Ceramic Gofer (old download)
and the analysis I use from the mine. The are all similar.
69.02 SiO2
17.13 Al2O3
0.15 Fe2O3
10.08 K2O
3.02 Na2O3
0.03 CaO
0.30 Loss on Ignition.
That gives a formula with unity on the Al2O3 as follows.
0.03 CaO
0.64 K2O
0.29 Na2O
..01 Fe2O3
1.00 Al2O3
6.85 SiO2
Ratio of 6.85
Ron Roy
Toronto, Canada
Evenings, call 416 439 2621
Fax, 416 438 7849
ronroy@astral.magic.ca
Cindy on sat 3 may 97
Ooops! Well, is my face red-- You're right, of course, Ron. I must
have had the highlighter on the wrong material. Insight's Custer formula is
actually very close to what you've listed. Sorry 'bout that.
Cindy Strnad
>
> Excuse me for barging in here but the above is not the right formula for
> Custer.
>
> I have checked three sources, Foresight, The Ceramic Gofer (old download)
> and the analysis I use from the mine. The are all similar.
>
> 69.02 SiO2
> 17.13 Al2O3
> 0.15 Fe2O3
> 10.08 K2O
> 3.02 Na2O3
> 0.03 CaO
> 0.30 Loss on Ignition.
>
> That gives a formula with unity on the Al2O3 as follows.
>
> 0.03 CaO
> 0.64 K2O
> 0.29 Na2O
> .01 Fe2O3
> 1.00 Al2O3
> 6.85 SiO2
>
> Ratio of 6.85
>
> Ron Roy
> Toronto, Canada
> Evenings, call 416 439 2621
> Fax, 416 438 7849
> ronroy@astral.magic.ca
Tony Hansen on sat 3 may 97
We get a truckload of custer feldspar in a few times a year and
they send an analysis each time. There is quite a bit of variation.
Here is the last one:
Lab No. P-7425
LOI .3
SiO2 68.2
Fe2O3 .12
CaO .3
MgO tr
Na2O 3.3
K2O 10.5
--
=================================================================
Tony Hansen, IMC thansen@mlc.awinc.com
INSIGHT5/Magic of Fire II demos at www.ceramicsoftware.com
BobWicks@aol.com on sun 4 may 97
Ron: I was reading your note to Cindy about the anaylsis for Custer Spar and
find myself a bit puzzeled.
>According to Insight, here is the analysis for Custer feldspar
>
>K2O 0.01
>NaO2 0.01
>Fe2O3 0.01
>TiO2 0.03
>Al2O3 1.00
>SiO2 2.03
Custer is known as a potash spar, indicating that the potassium is higher
than the sodium. I have Insight also I 'm also getting strange results that
defy my best judgement. My knowledge of this tells me that the potassium
should be higher than the sodium. Perhaps you can explain it in more detail.
Bobwicks@aol.com
Bill Aycock on mon 5 may 97
Bob-- apparently- in some strange way- your copy of Insight (and at least
one other!) got contaminated. I just checked my copy, and found:
0.030 CaO
0.660 K2O
0.330 Na2O
0.010 Fe2O3
1.040 Al2O3
7.100 SiO2
as you can see- the predominant flux IS the Potash, and the Silica is higher
than with most Spars. To a first approximation, almost all spars are near 1
mole total fluxes, 1 mole alumina, and 6 moles silica. The formula you gave
is apparently a clay, possibly one of the kaolins, since it has the
proportions of alumina to silica that are typical of them.
This leads me to think I had better check the other materials in the list,
for accuracy.
Bill, not really looking for another task left to do, on Persimmon Hill
At 05:21 PM 5/4/97 EDT, you wrote:
>----------------------------Original message----------------------------
>Ron: I was reading your note to Cindy about the anaylsis for Custer Spar and
>find myself a bit puzzeled.
>
>>According to Insight, here is the analysis for Custer feldspar
>>
>>K2O 0.01
>>NaO2 0.01
>>Fe2O3 0.01
>>TiO2 0.03
>>Al2O3 1.00
>>SiO2 2.03
>
>Custer is known as a potash spar, indicating that the potassium is higher
>than the sodium.
** Snip**
>
>Bobwicks@aol.com
>
>
Bill Aycock --- Persimmon Hill --- Woodville, Alabama, USA
--- (in the N.E. corner of the State)
also-- W4BSG -- Grid EM64vr baycock@hiwaay.net
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