francolite

OBS: Les grains [de phosphate dans les roches sédimentaires] peuvent être amorphes (collophanite), ce sont les plus fréquents, ou cristallisés (francolite).
OBS: Formule chimique : Ca[indice 5](PO[indice 4],CO[indice 3])[indice 3](F,OH) ou Ca[indice 10][(PO[indice 4])[indice 6-x](CO[indice 3]F)[indice x]]F[indice 2]

CONT: Fluorapatite is by far the most common mineral of the [apatite] series in crustal rocks, but pure fluorapatite is relatively rare ... The replacement of PO4 by CO3 is particularly common and apatite containing appreciable amounts of CO2 and more than 1 per cent F is named carbonate fluorapatite or francolite ...
OBS: Chemical formula: Ca[subscript 5](PO[subscript 4],CO[subscript 3])[subscript 3](F,OH) or Ca[subscript 10][(PO[subscript 4])[subscript 6-x](CO[subscript 3]F)[subscript x]]F[subscript 2]

OBS: Fórmula química: Ca[subíndice 5](PO[subíndice 4],CO[subíndice 3])[subíndice 3](F,OH) o Ca[subíndice 10][(PO[subíndice 4])[subíndice 6-x](CO[subíndice 3]F)[subíndice x]]F[subíndice 2]