Minerals identify

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Francolite

Phosphate mineral

Francolite is a carbonate rich variety of the mineral fluorapatite and is present in most sedimentary. It has a variable chemical composition which can be represented by (Ca,Mg,Sr,Na) 10(PO 4,SO 4,CO 3) 6F 2-3. The mineral was named after its occurrence at Wheal Franco , Whitchurch, Tavistock District, Devon, England

Identification