Calcium Feldspar

Alternate Names: Lime Spar, Lime Feldspar, Ca-Feldspar

Oxide	Analysis	Formula
CaO	10.82%	1.00
Al2O3	19.66%	1.00
SiO2	69.52%	6.00
Oxide Weight		518.48
Formula Weight		518.48

Notes

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.

Related Information

Links

Hazards	Feldspar Feldspars are abundant and varied in nature. They contain small amounts of quartz (while nepheline syenite does not).
URLs	http://www.webmineral.com/data/Anorthite.shtml Anorthite info at webmineral.com
Materials	Feldspar In ceramics, feldspars are used in glazes and clay bodies. They vitrify stonewares and porcelains. They supply KNaO flux to glazes to help them melt.
Materials	Potash Feldspar
Materials	SP-G Feldspar
Materials	Sil-o-spar
Typecodes	Generic Material Generic materials are those with no brand name. Normally they are theoretical, the chemistry portrays what a specimen would be if it had no contamination. Generic materials are helpful in educational situations where students need to study material theory (later they graduate to dealing with real world materials). They are also helpful where the chemistry of an actual material is not known. Often the accuracy of calculations is sufficient using generic materials.
Typecodes	Feldspar The most common source of fluxes for high and medium temperature glazes and bodies.
Oxides	CaO - Calcium Oxide, Calcia
Minerals	Anorthite A plagioclase feldspar.

Data

Hardness (Moh)	6-7
Frit Softening Point	1550C
Density (Specific Gravity)	2.7-2.8

By Tony Hansen
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