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| CAS No.: | 1306-05-4 |
|---|---|
| Name: | Fluorapatite (Ca5F(PO4)3) |
| Molecular Structure: | |
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| Formula: | Ca10F2O4P |
| Molecular Weight: | 533.77 |
| Synonyms: | Fluorapatite (Ca5F(PO4)3);fluorapatite |
| Density: | 3.205 g/cm3 |
| Solubility: | Soluble in water and hydrochloric acid. |
| Safety: | When heated to decomposition it emits very toxic fumes of F− and POx. See also FLUORIDES and PHOSPHATES. |
| PSA: | 288.18000 |
| LogP: | -1.83800 |
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Chemistry
Chemistry informtion about Fluorapatite (CAS NO.1306-05-4) is:
IUPAC Name: Dicalcium Fluoride Phosphate
Synonyms: Fluorapatite (Ca5F(PO4)3) ; Fluorapatite
MF: Ca5FO12P3
EINECS: 215-144-1
Uses
Fluorapatite (CAS NO.1306-05-4) can be used as a precursor for the production of phosphorus. It can be reduced by carbon in the presence of quartz:
4 Ca5(PO4)3F + 21 SiO2 + 30 C → 20 CaSiO3 + 30 CO + SiF4 + 6 P2
Upon cooling, white phosphorus (P4) is generated:
2 P2 → P4
Safety Profile
When heated to decomposition it emits very toxic fumes of F− and POx. See also FLUORIDES and PHOSPHATES.
Standards and Recommendations
OSHA PEL: TWA 2.5 mg(F)/m3
ACGIH TLV: TWA 2.5 mg(F)/m3; BEI: 3 mg/g creatinine of fluorides in urine prior to shift; 10 mg/g creatinine of fluorides in urine at end of shift.
NIOSH REL: (Inorganic Fluorides) TWA 2.5 mg(F)/m3
Analytical Methods
Fluorapatite (CAS NO.1306-05-4), can be synthesized in a two step process. First, calcium phosphate is generated by combining calcium and phosphate salts at neutral pH.This material then reacts further with fluoride sources (often sodium monofluorophosphate or calcium fluoride (CaF2)) to give the mineral. This reaction is integral in the global phosphorus cycle.
3 Ca2+ + 2 PO3−4 → Ca3(PO4)2
3 Ca3(PO4)2 + CaF2 → 2 Ca5(PO4)3F
Specification
Fluorapatite (CAS NO.1306-05-4), often with the alternate spelling of fluoroapatite, is a mineral with the formula Ca5F(PO4)3 (calcium halophosphate). Fluorapatite is a hard crystalline solid. Although samples can have various color (green, brown, blue, violet, or colorless), the pure mineral is colorless as expected for a material lacking transition metals. It is an important constituent of tooth enamel. Fluorapatite is the most common phosphate mineral. It occurs widely as an accessory mineral in igneous rocks and in calcium rich metamorphic rocks. It commonly occurs as a detrital or diagenic mineral in sedimentary rocks and is an essential component of phosphorite ore deposits. It occurs as a residual mineral in lateritic soils.