Apatite
Calcium Phosphate
Formula: Ca5(PO4)3(OH, F, Cl)
| DENS - Density (Specific Gravity) |
2.9-3.2 |
| HMOH - Hardness (Moh) |
5.0 |
| MLPT - Melting Point (MP) |
1300C D |
Richard Willis
Popular bone-ash substitute. Melts only superficially, with core hard and granular, so fuses with a difference, with very strong opacifying attributes. An interesting calcium phosphate to use where either calciums or phosphates are called for in glaze formulas, such as those calling for bone ash — owing to the molecular similarity — re- Ca3(PO4)2 in contrast to Ca5[(F, OH)(PO
4)3]. At temperatures below 1200ºC, apatite is a good substitute for bone ash, as, owing to its contribution of fluorine, it is a stronger flux.
Out Bound Links
In Bound Links
- (Oxides - Material source)
P2O5 - Phosphorus Pentoxide
Pictures
Calcite W Apatite
Apatite Crystals
Apatite In Calcite
Fluorite Apatite
Fluorapatite On Apatite
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Apatite" descrip="Calcium Phosphate" searchkey="" loi="0.00" casnumber="7757-93-9">
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="55.600" tolerance=""/>
<oxide symbol="P2O5" name="Phosphorus Pentoxide" status="" percent="42.200" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="LOI" name="Loss on Ignition" percent="2.200" tolerance=""/>
</volatiles>
</material> | 
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