This is the raw greenish-yellow francolite specimen. Dimensions: 2.2 x 2.0 x 0.8″ (5.5 x 5 x 2cm). Weight — 2.3oz (65 grams). Origin: Russia, Yakutia.
Some information about francolite:
Francolite is a carbonate rich variety of the mineral fluorapatite and is present in most sedimentary phosphorites. It has a variable chemical composition which can be represented by (Ca,Mg,Sr,Na)10(PO4,SO4,CO3)6F2-3. The mineral was named after its occurrence at Wheal Franco, Whitchurch, Tavistock District, Devon, England.