Nafertisite, a layer titanosilicate member of a polysomatic series including mica

Ferraris, Giovanni; Ivaldi, Gabriella; Khomyakov, A. P.; Соболева, С. В.; Belluso, Elena; Pavese, Alessandro

doi:10.1127/ejm/8/2/0241

Cited by 56 publications

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“…Yoshimuraite is also a member of a large group of layered Ti-and Zr-bearing silicates and silicophosphates that have been collectively referred to as the BM n heterophyllosilicate polysomatic series (Ferraris et al 1996). These minerals are generally restricted to silicadeficient hyperalkaline [(Na + K)/Al >> 1] igneous rocks, which are enriched in incompatible elements that are able to proxy for Si 4+ , most notably VI Ti 4+ and VI Zr 4+ .…”

Section: Discussionmentioning

confidence: 99%

“…The crystal chemistry and some of the topological relationships that exist among the members of the BM n heterophyllosilicate series have been discussed by Egorov-Tismenko & Sokolova (1990) and Ferraris et al (1996) (SO 4 ) 2-, as in innelite, or with (PO 4 ) 3-, as in yoshimuraite.…”

Section: Discussionmentioning

confidence: 99%

“…It contains a heterophyllosilicate layer (Ferraris et al 1996) of composition [TiSi 2 O 8 ] 4-formed from TiO 5 polyhedra cross-linked with corner-sharing (Si 2 O 7 ) clusters (Fig. 1).…”

Section: Description Of the Structurementioning

confidence: 99%

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THE CRYSTAL STRUCTURE OF YOSHIMURAITE, A LAYERED Ba-Mn-Ti SILICOPHOSPHATE, WITH COMMENTS ON FIVE-COORDINATED Ti4+

McDonald

Grice

Chao

2000

The Canadian Mineralogist

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The crystal structure of yoshimuraite, ideally Ba 2 Mn 2 TiO(Si 2 O 7 )(PO 4 )(OH), has been determined and refined to residuals of R = 3.0% and wR = 4.1% using material from the Taguchi mine, Aichi Prefecture, Honshu, Japan. It is triclinic, P1, with cell parameters a 5.386(1), b 6.999(1), c 14.748(3) Å, ␣ 89.98(1), ␤ 93.62(2), ␥ 95.50(2)%, V 552.3(1) Å 3 , with Z = 2. The mineral is strongly layered on (001), consisting of two quasi-tetrahedral layers composed of TiO 5 polyhedra cross-linked by cornersharing (Si 2 O 7 ) clusters. These layers bound on two sides a layer of closest-packed Mn 6 octahedra, thus forming a composite unit reminiscent of that found in 2:1 phyllosilicates. Such composite units are subsequently linked along [001] via an interlayerlike [Ba 2 (PO 4 )] sheet, the bonding between the two being relatively weak and resulting in the pronounced {001} cleavage observed in the mineral. Yoshimuraite is a member of the BM n heterophyllosilicate polysomatic series [specifically, the BM 0 polysome series], which includes phases such as astrophyllite, bafertisite and seidozerite.Keywords: yoshimuraite, barium manganese titanium silicophosphate hydrate, heterophyllosilicate polysomatic series, Taguchi mine, Japan. SOMMAIRENous avons résolu la structure cristalline de la yoshimuraïte, dont la composition idéale est Ba 2 Mn 2 TiO(Si 2 O 7 )(PO 4 )(OH), jusqu'à un résidu R de 3.0% (wR = 4.1%) en utilisant un échantillon de la mine Taguchi, préfecture d'Aichi, île de Honshu, au Japon. Il s'agit d'un minéral triclinique, P1, dont les paramètres réticulaires sont a 5.386 (1) 650THE CANADIAN MINERALOGIST preponderance of P 5+ over S 6+ in the isolated tetrahedral site. X-RAY CRYSTALLOGRAPHY AND CRYSTAL-STRUCTURE DETERMINATIONFor X-ray-diffraction intensity data, a plate measuring 0.09 ϫ 0.06 ϫ 0.04 mm was selected. Although Watanabe et al. (1961) indicated that the crystals of yoshimuraite examined by them all exhibit what they interpreted to be polysynthetic twinning on {001} (twin law unknown), the crystal used in this present study shows no evidence of such twinning after being studied by optical microscopy and X-ray-precession techniques. Single-crystal X-ray-precession photographs confirm that the mineral is triclinic, with possible space-groups P1 and P1. Intensity data were collected on a fully automated Nicolet R3m four-circle diffractometer. A set of 25 reflections was used to orient the crystal and to refine the cell dimensions. Intensity data were collected out to 2 = 60° using the :2 scan mode and a scan range of 2°. A variable scan-rate inversely proportional to the peak intensity was used, with maximum and minimum scan-rates of 29.3° 2/min and 4.0° 2/min, respectively. Data pertinent to the collection of the intensity data are given in Table 2.The data were subsequently corrected for Lorentz, polarization, background effects and absorption and reduced to structure factors using the SHELXTL PC (Sheldrick 1990) package of computer programs. For the ellipsoidal absorption correction, eleve...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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THE CRYSTAL STRUCTURE OF YOSHIMURAITE, A LAYERED Ba-Mn-Ti SILICOPHOSPHATE, WITH COMMENTS ON FIVE-COORDINATED Ti4+

McDonald

Grice

Chao

2000

The Canadian Mineralogist

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“…Belov [15] and Pyatenko et al [16] made further generalizations and called minerals with a "seidozerite block" (=TS block, [17]) and astrophyllite-group minerals titanosilicate analogues of micas. The modular approach to these minerals has been developed by Egorov-Tismenko and Sokolova [18,19], who described a homologous series of Ti-analogues of micas, and Ferraris [20][21][22], who named those minerals heterophyllosilicates and described them as members of a single polysomatic series. Sokolova [17] quantitatively divided TS-block minerals into four groups based on the content of Ti, structural topology and stereochemistry of the TS block.…”

Section: Introductionmentioning

confidence: 99%

Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation

et al. 2018

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Abstract:The crystal structure of shkatulkalite has been solved from the crystal from the Lovozero alkaline massif, Kola Peninsula, Russia. The mineral is monoclinic, P2/m, a = 5.4638(19), b = 7.161(3), c = 15.573(6) Å, β = 95.750(9) • , V = 606.3(4) Å 3 , R 1 = 0.080 for 1551 unique observed reflections. The crystal structure is based upon the HOH blocks consisting of one octahedral (O) sheet sandwiched between two heteropolyhedral (H) sheets. The blocks are parallel to the (001) plane and are separated from each other by the interlayer space occupied by Na1 atoms and H 2 O groups. The Na2, Na3, and Ti sites are located within the O sheet. The general formula of shkatulkalite can be written as Na 5 (Nb 1−x Ti x ) 2 (Ti 1−y Mn 2+ y )[Si 2 O 7 ] 2 O 2 (OH) 2 ·nH 2 O, where x + y = 0.5 and x ≈ y ≈ 0.25 for the sample studied. Shkatulkalite belongs to the seidozerite supergroup and is a member of the lamprophyllite group. The species most closely related to shkatulkalite are vuonnemite and epistolite. The close structural relations and the reported observations of pseudomorphs of shkatulkalite after vuonnemite suggest that, at least in some environments, shkatulkalite may form as a transformation mineral species.

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“…For example, magnesium astrophyllite (Shi et al 1998), which is monoclinic, exhibits a dominance of Na within [6] Ti, Nb or Zr, and T = [4] Si and Al. Following a modular approach applied to structures of similar titanosilicates (i.e., nafertisite, lamprophyllite), Ferraris et al (1996) have described astrophyllite-group minerals as heterophyllosilicates having a HOH-structure (Fig. 4) consisting of a sheet of close-packed octahedra (O-sheet; Fig.…”

Section: The O Sheetmentioning

confidence: 99%

Niobokupletskite, a New Astrophyllite-Group Mineral From Mont Saint-Hilaire, Quebec, Canada: Description and Crystal Structure

Piilonen

Lalonde

McDonald

et al. 2000

The Canadian Mineralogist

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Niobokupletskite is a new member of the astrophyllite group found in nepheline syenite pegmatites at Mont Saint-Hilaire, Quebec, in association with aegirine, albite, analcime, calcio-ancylite-(Ce), calcite, catapleiite, epididymite, fluorite, genthelvite, microcline, natrolite, pyrochlore, rhodochrosite and wurtzite. It is transparent, with a vitreous luster, brittle with a perfect {001} cleavage, and has an uneven to splintery fracture. Niobokupletskite is biaxial positive, ␣ 1.718 (1) SOMMAIRELa niobokupletskite est une nouvelle espèce minérale, membre du groupe de l'astrophyllite, que l'on retrouve dans les pegmatites syénitiques à néphéline du Mont Saint-Hilaire, Québec, en association avec aegyrine, analcime, calcite, catapléite, épididymite, fluorite, genthelvite, microcline, natrolite, pyrochlore, rhodochrosite et wurtzite. C'est un minéral transparent, avec éclat vitreux, cassant, avec un clivage {001} parfait et une fracture irrégulière à fibreuse. La niobokupletskite est biaxe positive, avec ␣ 1.718(1), ␤ 1.733(1), ␥ calc 1.750(1), 2V observé = 87(2)°. Le minéral est triclinique, groupe spatial P1, avec paramètres réticulaires a 5.4303(9), b 11.924(2), c 11.747 (2)

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Nafertisite, a layer titanosilicate member of a polysomatic series including mica

Cited by 56 publications

References 0 publications

THE CRYSTAL STRUCTURE OF YOSHIMURAITE, A LAYERED Ba-Mn-Ti SILICOPHOSPHATE, WITH COMMENTS ON FIVE-COORDINATED Ti4+

THE CRYSTAL STRUCTURE OF YOSHIMURAITE, A LAYERED Ba-Mn-Ti SILICOPHOSPHATE, WITH COMMENTS ON FIVE-COORDINATED Ti4+

Shkatulkalite, a Rare Mineral from the Lovozero Massif, Kola Peninsula: A Re-Investigation

Niobokupletskite, a New Astrophyllite-Group Mineral From Mont Saint-Hilaire, Quebec, Canada: Description and Crystal Structure

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