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Calcium Feldspar

Formula: CaO.Al2O3.4SiO2 or CaAl2Si2O8
Alternate Names: Lime Spar, Lime Feldspar, Ca-Feldspar

OxideAnalysisFormula
CaO10.82%1.000
Al2O319.66%0.999
SiO269.52%5.998
Oxide Weight518.48
Formula Weight518.48
If this formula is not unified correctly please contact us.
DENS - Density (Specific Gravity) 2.7-2.8
HMOH - Hardness (Moh) 6-7
GSPT - Frit Softening Point 1550C

Feldspars are roughly divided into lithium, potash, soda, and calcium according the to fluxing oxide that predominates (theoretical formulae for each type are not found in nature). Calcium feldspars are not common and never near theoretical. Thus even if the CaO does not predominate over the K2O and Na2O it may still be labeled a Ca-Feldspar if there is an appreciable amount.


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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Calcium Feldspar" descrip="" searchkey="Lime Spar, Lime Feldspar, Ca-Feldspar" loi="0.00" casnumber="12168-80-8"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="10.820" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="19.660" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="69.520" tolerance=""/> </oxides> </material>


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