| Francolite | |
|---|---|
 Francolite found in Russia | |
| General | |
| Category | Phosphate minerals |
| Formula | (Ca,Mg,Sr,Na)10(PO4,SO4,CO3)6F2−3 |
Francolite is a carbonate rich variety of the mineralfluorapatite[1] and is present in mostsedimentaryphosphorites. It has a variable chemical composition which can be represented by(Ca,Mg,Sr,Na)10(PO4,SO4,CO3)6F2−3.[2] The mineral was named after its occurrence atWheal Franco, Whitchurch, Tavistock District,Devon, England.[1]
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