...-clinoholmquistite [□Li 2 Mg 3 Fe 3+ 2 Si 8 O 22 (OH)2] - ferri-clinoferroholmquistite [□Li 2 Fe 2+ Fe 3 + 2 Si 8 O 22 (OH) 2 ]. SEM-EDS and X-ray powder diffraction show that at 500 °C, amphibole is the dominant phase in the run assemblage, together with minor clinopyroxene + quartz, in the Fe-rich side of the join...

...Roberta Oberti; Fernando Cámara; Luisa Ottolini Abstract Re-examination of holotype “clinoholmquistite”, ideally A □ B Li 2 C (Mg 3 Al 2 ) T Si 8 O 22 X (OH) 2 ( Ginzburg 1965 ) from the Tastyg spodumene deposit, Tuva, Siberia, Russia by EMP and SIMS analysis and structure refinement shows...

...Jose M. Caballero; Angeles Monge; Angel La Iglesia; Fernando Tornos Abstract Ferri-clinoholmquistite is a new amphibole species from episyenites in the East Pedriza Massif (Central System, Spain), where it is associated to albite, augite-aegirine, titanite, andradite, magnetite, and apatite...

... and of another crystal with higher clinoholmquistite component, both of which were also analyzed by ion microprobe for light and volatile elements, allowed us to assess Li partitioning among the B- and C-group sites and the active crystal-chemical mechanisms; Li is ordered at the [6+2]-coordinated position...

... by the occurrence of ferro- and ferri-ferroclinoholmquistites, and the lack of clinoholmquistite. Detailed crystal-chemical analysis shows: (1) a remarkable constancy in composition, both in terms of charge arrangement and of limited homovalent M1,3 (Mg −1 Fe 2+ ), M2 (Al −1 Fe 3+ ), and O3 (OH −1 F) exchanges, (2...

.... The lowest frequency value known for such an arrangement is that of ferri-clinoholmquistite ( Iezzi et al. , 2004 a ), where the OH-stretching band is observed at 3662 cm −1 (sample 251 of Iezzi et al , 2004 a ), while the highest-frequency value for the same local configuration is that of tremolite...

..., the holotype sample of `clinoholmquistite' (Ginzburg, 1965). The sample was listed as coming from the Sutlug River, Tuva Republic, Russia. It occurs at the endogenic contact of a Li pegmatite with country rocks near to a diabase dyke and formed by reaction of the pegmatitic melt with the country rock. Crystals...

... Li 2 C (R 2+ 3 R 3+ 2 ) T Si 8 O 22 W (OH) 2 , which can occur either with monoclinic C 2/ m symmetry (clinoholmquistite) or with orthorhombic Pnma symmetry (holmquistite). However, Hawthorne (1978) reported 0.34 C Li pfu in a fluororiebeckite sample, and Ghose et al. (1986) reported...

... and all Li-rich varieties known belonged either to the orthorhombic holmquistite or the monoclinic clinoholmquistite series [□Li 2 (Mg 3 Al 2 ) Si 8 O 22 (OH) 2 ], being part of the Mg-Fe-Mn-Li group, or they were in the sodic amphibole group, being members of the leakeite [Na Na 2 (LiMg 2 Fe 3+ 2...

... to A. Until recently, Li was only rarely determined in amphiboles and all Li-rich varieties known belonged either to the orthorhombic holmquistite or the monoclinic clinoholmquistite series [□ Li 2 (Mg 3 Al 2 )Si 8 O 22 (OH) 2 ], being part of the Mg-Fe-Mn-Li group, or they were in the sodic amphibole group...

... [root composition Li 2 (Mg 3 Al 2 )Si 8 O 22 (OH) 2 ] and in clinoholmquistite ( Ginsburg, 1965 ); however, the latter was recently discredited by Oberti et al . ( 2005 ). C -group Li, strongly ordered at the M (3) site, was first identified as a major constituent in leakeite [ A Na B Na 2 C...

... is allocated to A. Until recently, Li was only rarely determined in amphiboles and all Li-rich varieties known belonged either to the orthorhombie holmquistite or the monoclinic clinoholmquistite series [□Li 2 (Mg 3 Al 2 )Si 8 O 22 (OH) 2 ], being part of the Mg-Fe-Mn-Li group, or they were in the sodic...

... either to the orthorhombic holmquistite or the monoclinic clinoholmquistite series [□Li 2 (Mg 3 Al 2 ) Si 8 O 22 (OH) 2 ], being part of the Mg–Fe–Mn–Li group, or they were in the sodic amphibole group, being attributed to leakeite [Na Na 2 (LiMg 2 Fe 3+   2 ) Si 8 O 22 (OH) 2 ] or kornite [(NaK...

...-clinoferroholmquistite (with Na > 0.5 apfu) has been described so far [ Caballero et al. 1998 , redefined in American Mineralogist, 83, 668 (1998)]. clinoholmquistite Mg-Fe-Mn-Li □ Li 2 Mg 3 Al 2 Si 8 (OH) 2 ferri-clinoferroholmquistite* Mg-Fe-Mn-Li □ Li 2 Fe 2+ 3 Fe 3+ 2 Si 8 (OH) 2...

... spectrometry, SIMS). Since the late 1950s, lithium was known to occur as the major B (M4 site) cation in holmquistite and clinoholmquistite, minerals which occur in Li-rich pegmatites. In the 1990s, lithium was found to be a rather common constituent in sodic amphiboles from both peralkaline granites...

... along the magnesioriebeckite-ferri-clinoholmquistite join . Physics and Chemistry of Minerals , 32 , 103 – 113 . Della Ventura G. Iezzi G. Redhammer G.J. Hawthorne F.C. Scaillet B. Novembre D. ( 2005b ) Synthesis and crystal-chemistry of alkali amphiboles in the system...