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Old 07-25-2017, 09:44 AM
Ron Mynatt Ron Mynatt is online now
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spodumene

I am thinking of changing my recipe since Lithium Carb. is now $14.95 a lb.I have access to 1000 lb of spodumene . It does not show the Fraction or reciprocal in Glass Notes, does anyone know where I can find the info to sub spodumene for 1.25 lbs of Litium Carb.
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Old 07-25-2017, 11:35 AM
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Spodumene is a typical feldspar. If you go the pages in glassnotes which give out the percents, just plug in lithium where it indicates either sodium or potassium. Something like 13-14%. John Croucher did have me using a 4.90 expansion coefficient for the lithium. As is often the case, the downside is tramp iron in your formula.

You need to account for the silica and the alumina in the spar. Without looking it up, it seems to me the silica is about 67% and the alumina 17%
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Old 07-25-2017, 03:44 PM
Hugh Jenkins Hugh Jenkins is offline
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Spodumene is a very standard ceramic glaze component. Check any potter's recipe reference for oxide breakdown.
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Old 07-27-2017, 02:09 PM
Tom Littleton Tom Littleton is offline
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Get a chemical analysis from the manufacturer. There can be variations from producer to producer and from mine to mine.
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Last edited by Tom Littleton; 07-27-2017 at 05:23 PM.
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Old 07-27-2017, 03:11 PM
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then, you gotta test...
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Old 08-04-2017, 11:28 AM
Ron Mynatt Ron Mynatt is online now
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After thinking about spodumene in the recipe I went back to the archives and found Pete's old recipe and adapted it for sodium silicate, whiting, zinc and barium carb. to keep the LEC near.Ken Kubiak wrote the spreadsheet so if anyone could use it let me know.My question is perhaps to Pete and Dave B. or anyone else that has any thoughts on the matter. I know since it is close to my current recipe's LEC it is compatible to Kuglar and the other colors so that is not a worry. My questions would dolomite be a benefit vs whiting?The whiting does not have the tramp iron that dolomite has but does not have the Mgo? The barium carb. to add that little bump to brilliance.What are the thoughts .It is not as simple as Pete's has but I am thinking it is close.
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Old 08-04-2017, 12:22 PM
Shawn Watt Shawn Watt is online now
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I don't have any answers for you but I would love to have that spreadsheet
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Old 08-04-2017, 01:03 PM
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I can't read the spreadsheet.

If I want Magnesium, I use magnesium. It's mainly a matter of tramp materials in the spars. I do like spars for the alumina since it's so fine a mesh but it has its downside as well. Lately, I've gone to alumina hydrate. If I want lithium, I use lithium. Batch costs are not nearly as important to me on glass as is purity and clarity. Quality issues sneak up on you when you use very many compounds with trace stuff. Sometimes you have to go back and melt a clean one to realize how far you may have strayed without recognizing it.
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Old 08-04-2017, 02:05 PM
Ron Mynatt Ron Mynatt is online now
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I did not realize the size when I put it on CW.If anyone wants me to email them a working copy let me know The recipe for My Sodium silicate recipe is

Silica 18.71 lbs
Sodium silicate 27.64 lbs
Barium Carb. .25
Calcium Carb. 7.6 lbs
Pot Carb. 4.8 lbs
Pot.Nitrate .20
Zinc oxide .5
Antimony .10
LEC 92.96 Yes I know I am only dreaming if I think the decimal point matters. call it 93

Pete's recipe
100 lbs Silica
28 lbs Soda ash
14 lbs Lime (hydrated)
12 lbs Pot Carb.
50 lbs Pot Nitrate
.25 lbs antimony
lec 92.98 call it 93
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Old 08-04-2017, 02:12 PM
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I haven't used the formula cited in an awfully long time. WHile it was a nice clear, it needs alumina. It doesn't look like anything I do today at all.
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