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LAHTI, SEPPO I. and SUOMINEN, VELI, 1988: Occurrence, crystallography and chemistry of the fluocerite-bastnaesite-cerianite intergrowth from the Fjälskär granite, southwestern Finland. Bull. Geol. Soc. Finland 60, Part 1, 45—53. White crystals composed mainly of fluocerite were identified during separation of the accessory minerals of the Middle Proterozoic Fjälskär granite, southwestern Finland. Detailed X-ray diffraction and microprobe studies showed that the mineral is intergrown with bastnaesite and cerianite. X-ray single crystal studies reveal that fluocerite-(Ce) (a = 7.11 Å, c = 7.28 Å, space group P63mcm) forms in the mineral syntaxial intergrowth with bastnaesite(Ce) (a = 7.11 A, c = 9.74 Å, space group P62c). The cerianite phase (a = 5.45 Å, space group Fm3m) is intergrown with fluocerite-bastnaesite in a more complex way. The [00011 plane of fluocerite-bastnaesite is parallel to the (111J plane of cerianite and the [1000] plane of fluocerite-bastnaesite is parallel to the (llO) or corresponding plane of cerianite. The fluocerite-bastnaesite-cerianite intergrowth is dominated by LREEs, especially Ce, La and Nd. Its composition varies slightly; pure separate phases cannot be distinguished with the microprobe. Zircon and fluorite associated with fluocerite have minor REEs (below 0.3 wt% RE203) . The Fjälskär granite is exceptionally enriched in REEs mainly incorporated in fluocerite and associated REE minerals. The C02-bearing fluids altered fluocerite to bastnaesite as crystallization drew to an end in the rock. Separation of the cerianite phase was due to later oxidation of Ce + . Because of structural and chemical similarities, the crystallographic axes of the various phases are preferentially oriented in the intergrowth.