Lepidolite
Formula: LiF.KF.Al2O3.3SiO2
| DENS - Density (Specific Gravity) |
3.00 |
| MLRG - Melting Range (C) |
1150-1300C |
It has a lower fusion point than most high temperature feldspars. The fluorine content can cause problems with glaze bubbles and surface pitting.
It is tricky to establish a formula weight and analysis for this material. Here are some of the factors:
-LOI varies, but we have assumed 5% water in this example.
-Lepidolite does not actually contain Li2O, it has to absorb oxygen from the atmosphere or other materials during firing since the Li is bonded to F.
-Fluorine is bonded to potassium so oxygen has to be absorbed to create K2O.
-For both Li and K only 1/2 of a molecule per input molecule of lepidolite will be yielded.
-In a complete oxidation firing all of the fluorine will volatilize and none will be in the final glass. However in real world conditions none of these is likely to happen completely, and in a reduction firing none may happen at all. In this case we are assuming it is all LOI.
Given the above assumptions, an input of LiF.KF.Al2O3.3SiO2 would yield:
1/2 Li2O
1/2 K2O
2 F
1 Al2O3
3 SiO2
5 LOI
Considering the F as LOI we would have the chemistry quoted here.
To properly handle a material like this in ceramic calculations fluorine conversion factors have to be employed.
Out Bound Links
- (URLs)
Lepidolite at Mineral.galleries.com
http://mineral.galleries.com/minerals/silicate/lep... - (URLs)
Lepidolite at WebMineral.com
http://webmineral.com/data/Lepidolite.shtml - (URLs)
Lepidolite at Mindat.org
http://www.mindat.org/show.php?name=Lepidolite - (URLs)
Lepidolite at Wikipedia
http://en.wikipedia.org/wiki/Lepidolite - (Materials - Related)
Petalite - LiAlSi4O10 or Li2O.Al2O3.8SiO2
- (Materials - Related)
Amblygonite - Li.AlF.PO4 - Lithium alumino-fluophosphate
- (Materials - Related)
Spodumene - Li2O.Al2O3.4SiO2 or LiAl(Si2O6)
- (Hazards - General)
Lithium in Ceramics
The toxicity of lithium in ceramics is a hotly deb... - (Typecodes)
1: GNM - Generic Material
- (Typecodes)
1: FEL - Feldspar
- (Materials - Related)
Mica
Isinglass, Muscovite, Biotite, Phlogopite
- (MDT - Member)
Europe
Countries of Eastern Europe and former Soviet Unio... - (MDT - Member)
Australia
We are working on this database and would apprecia... - (MDT - Member)
Asia
All of Asia including Turkey, Russia, Indosnesia, ... - (Minerals - Mineral equivalent)
Lepidolite
Although this material is sometimes referred to as... - (MDT - Member)
Africa
All of continental Africa. We are working on this ... - (MDT - Member)
Latin and South America
Latin America and South America. We are working on... - (MDT - Member)
New Zealand
We are working on this database and would apprecia... - (MDT - Member)
North America
The decision about what materials to include in th... - (MDT - Member)
UK
We are working on this database and would apprecia... - (MDT - Member)
Crystal Glazes
These materials are specially defined for makers o...
In Bound Links
- (Materials - Related)
Lepidolite - From Ron Roys MDT
Lithium Mica
- (Materials - Related)
Triphylite
LiFePO4
- (Oxides - Material source)
Li2O - Lithium Oxide, Lithia
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Lepidolite" descrip="" searchkey="Lithium Mica" loi="0.00" casnumber="12168-80-8">
<oxides>
<oxide symbol="Li2O" name="Lithium Oxide, Lithia" status="U" percent="3.000" tolerance=""/>
<oxide symbol="K2O" name="Potassium Oxide" status="U" percent="7.300" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="26.900" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="47.700" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="H2O" name="Water" percent="4.700" tolerance=""/>
<volatile symbol="LOI" name="Loss on Ignition" percent="10.000" tolerance=""/>
</volatiles>
</material> | 
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