...Igor V. Pekov; Natalia V. Zubkova; Tomas A. Husdal; Natalia N. Kononkova; Atali A. Agakhanov; Aleksandr E. Zadov; Dmitry Yu. Pushcharovsky Abstract Carlgieseckeite-(Nd), ideally NaNdCa 3 (PO 4 ) 3 F, a new mineral species of the belovite group of the apatite supergroup, was found at the Kuannersuit...

... per 10 Ca sites) and belovite-(Ce) [ideally Sr 6 ( REE 2 Na 2 )(PO 4 ) 6 F 2 ] have been refined to R values of 0.016 and 0.014, respectively, in order to examine the incorporation of Sr in apatite and apatite-group minerals. In strontian fluorapatite, Sr is ordered at the Ca(2) site...

... from two overprinting episodes of metasomatism. In terms of composition, both core and rim are intermediate members of a solid solution between fluorapatite and belovite-(Ce), with the belovite content increasing toward the rim. Homogeneous crystals are compositionally equivalent to the rim...

... in the following sequence: orthomagmatic fluorapatite; strontian britholite-(Ce); strontian fluorapatite; Sr-apatite; REE -rich Sr-apatite; Sr-Na- REE -rich minerals approaching the stoichiometry of belovite-(Ce) and deloneite-(Ce); britholite-(Ce). Increasing alkalinity of the deuteric fluids is reflected...

..., hydroxylapatite, belovite-(La), belovite-(Ce), gaidonnayite, nenadkevichite, epididymite, apophyllite-(KF), and sphalerite. Saamite has perfect cleavage on {001}, uneven fracture and a Mohs hardness ca. 3. Its calculated density is 3.243 g/cm 3 . Saamite is biaxial positive with α 1.760, β 1.770, γ 1.795 (λ 589...

..., belovite-(La), belovite-(Ce), gaidonnayite, nenadkevichite, epididymite, apophyllite-(KF), and sphalerite. Kolskyite has perfect cleavage on {001}, splintery fracture, and a Mohs hardness of 3. Its calculated density is 2.509 g/cm 3 . Kolskyite is biaxial negative with α 1.669, β 1.701, γ 1.720 (λ 590 nm...

...–15 μm thick and up to 330 μm across. It is colourless to pale tan, with a white streak and a vitreous lustre. The mineral formed in a pegmatite as a result of hydrothermal activity. Associated minerals are natrolite, barytolamprophyllite, nechelyustovite, hydroxylapatite, belovite-(La), belovite-(Ce...

... peninsula, Russia. Associated minerals are natrolite, microcline, aegirine, pectolite, lamprophyllite, belovite-(Ce), belovite-(La), gaidonnayite, nenadkevichite, komarovite, manganokukisvumite, epididymite, sphalerite, neotocite, etc . Stronadelphite forms hexagonal, prismatic to acicular crystals up...

...), fluorcaphite, belovite-(Ce), umbite, lemmleinite-K, lomonosovite, lovozerite, phlogopite, sphalerite and galena. The mineral was found in only one hand specimen of pegmatite as a corroded irregularly shaped grain about 3 mm across, intergrown with sodalite, megakalsilite and natrite. It is transparent...