Australian Spodumene
Lithium Feldspar, Li2O.Al2O3.4SiO2
Chemistry
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Volatiles
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Significant Temperatures
- 1082C: An irreversible phase transition occurs to yield beta-spodumene, accompanied by a 30% volume increase and subsequent decrease in the specific gravity from 3.2 to 2.4.
Links to Other Materials
Miscellaneous
- Family: Feldspar
- Region: Australia
- Mined At: Unspecified
- Raw Mineral: No
- Generic: No
Notes
Australian spodumenes are considered the whitest in the world.
The material features [Si2O6]3- chains bonded together by lithium and aluminium ions. It is a monoclinic pyroxene in the form of long tabular, prismatic crystals.
Beta-spodumene (formed at 1082C) has a very low coefficient of thermal expansion, about 1 x 10-6/°C for the range 25°C to 1000°C.
Data
- Hardness (Moh): 6-5-7
- Melting Point (MP): 1420C
- Specific Gravity: 3.2
- Hardness (Moh): 6-5-7
- Melting Point (MP): 1420C
- Specific Gravity: 3.2
URLs
- Description of material - http://www.amalgamet.com/Products/minerals.htm
Suppliers
- Sons of Gwalia Ltd
Authors
- Tony Hansen (Owner)
XML
<?xml version="1.0" encoding="UTF-8"?>
<material name="Australian Spodumene" descrip="Lithium Feldspar, Li2O.Al2O3.4SiO2" generic="0" rawmineral="0" searchkey="Ausi Spodumene, Ausi Spod" loi="0.20">
<families>
<family name="Feldspar"/>
</families>
<regions>
<region name="Australia"/>
</regions>
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.050" tolerance="0.90"/>
<oxide symbol="Li2O" name="Lithium Oxide, Lithia" status="U" percent="7.600" tolerance="0.25"/>
<oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.080" tolerance="0.25"/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="U" percent="0.150" tolerance="max"/>
<oxide symbol="P2O5" name="Phosphorus Pentoxide" status="" percent="0.170" tolerance="0.40"/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.010" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="26.500" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="64.500" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="U" percent="0.070" tolerance="max"/>
<oxide symbol="MnO" name="Manganous Oxide" status="" percent="0.020" tolerance="max"/>
</oxides>
<volatiles>
<volatile symbol="" name="" percent="0.200" tolerance=""/>
</volatiles>
<references>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
</references>
<temperatures>
<temperature temperature="1082C" notes="An irreversible phase transition occurs to yield beta-spodumene, accompanied by a 30% volume increase and subsequent decrease in the specific gravity from 3.2 to 2.4."/>
</temperatures>
<suppliers>
<supplier name="Sons of Gwalia Ltd" country="AU" url="http://www.spodumene.com" label=""/>
</suppliers>
<notes>
<note>Australian spodumenes are considered the whitest in the world.
The material features [Si2O6]3- chains bonded together by lithium and aluminium ions. It is a monoclinic pyroxene in the form of long tabular, prismatic crystals.
Beta-spodumene (formed at 1082C) has a very low coefficient of thermal expansion, about 1 x 10-6/°C for the range 25°C to 1000°C. </note>
</notes>
<testdata>
<testitem testname="2" value="6-5-7"/>
<testitem testname="2" value="1420C"/>
<testitem testname="2" value="3.2"/>
<testitem testname="2" value="6-5-7"/>
<testitem testname="2" value="1420C"/>
<testitem testname="2" value="3.2"/>
</testdata>
</material>
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