Noonkanbahite, BaKNaTi2(Si4O12)O2, a new mineral species: description and crystal structure

AbstractNoonkanbahite, ideally BaKNaTi2(Si4O12)O2, is described as a new mineral species. At Liley [Löhley], Eifel Mountains, Germany (the holotype locality), it occurs as sprays of prismatic crystals (up to 8 mm) or single prismatic crystals (up to 4 mm) on walls of cavities in alkaline igneous rocks. At Murun, Siberia, Russia, noonkanbahite forms coarse lamellar crystals up to 0.05 cm × 0.7 cm × 1.5 cm embedded in kalsilite syenite. Noonkanbahite is brittle, H = 6, Dobs. = 3.39(1), Dcalc. = 3.49 g/cm3, has a vitreous lustre and does not fluoresce in ultraviolet light. It has poor cleavage on {010} and {100} and weak parting on {011}. Noonkanbahite is biaxial positive with 2Vobs. = 75(2)°, 2Vcalc. = 72.7(9)°, α 1.730(5), β 1.740(5) and γ 1.765(5), dispersion is medium, r < v. In transmitted plane-polarized light, noonkanbahite is strongly pleochroic, with X colourless, Y yellowish, Z straw-yellow; X = a, Y = b, Z = c. Noonkanbahite is orthorhombic, space group Imma, a = 8.0884(4), b = 10.4970(5), c = 13.9372(6) Å, V = 1183.3(1) Å3, Z = 4. The strongest ten X-ray diffraction lines in the powder pattern [d in Å (I)(hkl)] are: 2.907(100)(222), 8.353(50)(001), 3.196(50)(220), 2.097(50)(242), 2.241(40)(215), 2.179(40)(035), 3.377(30)(031), 2.694(30)(015), 2.304(30)(233), and 1.564(30)(064). Electron microprobe analysis gives SiO2 37.82, TiO2 15.54, ZrO2 0.42, Nb2O5 3.18, Al2O3 0.17, Fe2O3 (recalculated from FeO) 5.63, MnO 0.32, MgO 0.53, BaO 20.60, CaO 1.36, K2O 5.32, Na2O 6.14, F 0.78, H2O 0.58, sum 98.39 wt.%, (H2O determined by SIMS). The formula unit, calculated on the basis of 14 anions (O+OH+F), is (Ba0.85K0.13)Σ0.98(K0.59Na0.26Ca0.15)Σ1.00Na(Ti1.23Fe0.453+Nb0.15Mg0.08Mn0.03Zr0.02Al0.01)Σ1.97 (Si3.99Al0.01O12)(O1.33OH0.41F0.26)Σ2.00, Z = 4.The crystal structure was refined to R1 = 2.8% for 970 unique (F0 > 4σF) reflections collected on a Bruker single-crystal P4 diffractometer with a CCD detector and MoKα X-radiation. The crystal structure of noonkanbahite is isostructural with that of batisite, ideally BaNa2Ti2(Si4O12)O2, and scherbakovite, ideally K2NaTi2(Si4O12)O(OH). There are two octahedrally coordinated sites, M(1) and M(2), occupied by (Ti1.23Fe0.453+Nb0.15Mg0.08Mn0.03Zr0.02Al0.01), ideally Ti2 a.p.f.u. There are three interstitial A sites, [9]A(1), [8]A(2) and [6]A(3), occupied by Ba, K and Na, respectively. Si tetrahedra and M octahedra form a framework with interstitial cages occupied by Ba, K and Na atoms at the A sites. Noonkanbahite, BaKNaTi2(Si4O12)O2, is a K analogue of batisite, BaNa2Ti2(Si4O12)O2, and a Ba analogue of shcherbakovite, K2NaTi2(Si4O12)O(OH).

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Shilovite, natural copper(II) tetrammine nitrate, a new mineral species

Mineralogical Magazine ◽

10.1180/minmag.2015.079.3.07 ◽

2015 ◽

Vol 79 (3) ◽

pp. 613-623 ◽

Cited By ~ 10

Author(s):

Nikita V. Chukanov ◽

Sergey N. Britvin ◽

Gerhard Möhn ◽

Igor V. Pekov ◽

Natalia V. Zubkova ◽

...

Keyword(s):

Crystal Structure ◽

Chemical Composition ◽

Infrared Spectrum ◽

Copper Complex ◽

New Mineral ◽

X Ray Diffraction ◽

Orthorhombic Space Group ◽

X Ray ◽

New Mineral Species ◽

Mohs Hardness

AbstractThe new mineral shilovite, the first natural tetrammine copper complex, was found in a guano deposit located on the Pabellón de Pica Mountain, near Chanabaya, Iquique Province, Tarapacá Region, Chile. It is associated with halite, ammineite, atacamite (a product of ammineite alteration) and thénardite. The gabbro host rock consists of amphibole, plagioclase and minor clinochlore, and contains accessory chalcopyrite. The latter is considered the source of Cu for shilovite. The new mineral occurs as deep violet blue, imperfect, thick tabular to equant crystals up to 0.15 mm in size included in massive halite. The mineral is sectile. Its Mohs hardness is 2. Dcalc is 1.92 g cm–3. The infrared spectrum shows the presence of NH3 molecules and NO3– anions. Shilovite is optically biaxial (+), α = 1.527(2), β = 1.545(5), γ = 1.610(2). The chemical composition (electron-microprobe data, H calculated from ideal formula, wt.%) is Cu 26.04, Fe 0.31, N 30.8, O 35.95, H 4.74, total 100.69. The empirical formula is H12.56(Cu1.09Fe0.01)N5.87O6.00. The idealized formula is Cu(NH3)4(NO3)2. The crystal structure was solved and refined to R = 0.029 based upon 2705 unique reflections having F > 4σ(F). Shilovite is orthorhombic, space group Pnn2, a = 23.6585(9), b = 10.8238(4), c = 6.9054(3) Å, V = 1768.3(1) Å3, Z = 8. The strongest reflections of the powder X-ray diffraction pattern [d, Å (I,%) (hkl)] are: 5.931 (41) (400), 5.841 (100) (011), 5.208 (47) (410), 4.162 (88) (411), 4.005 (62) (420), 3.462 (50) (002), 3.207 (32) (031), 2.811 (40) (412).

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As-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: III. Canosioite, Ba2Fe3+(AsO4)2(OH), description and crystal structure

Mineralogical Magazine ◽

10.1180/minmag.2016.080.097 ◽

2017 ◽

Vol 81 (2) ◽

pp. 305-317 ◽

Cited By ~ 2

Author(s):

F. Cámara ◽

E. Bittarello ◽

M. E. Ciriotti ◽

F. Nestola ◽

F. Radica ◽

...

Keyword(s):

Crystal Structure ◽

Direct Methods ◽

Mineral Species ◽

New Mineral ◽

X Ray Diffraction ◽

Calculated Density ◽

International Mineralogical Association ◽

New Mineral Species ◽

Ore Minerals ◽

Mn Oxides

AbstractThe new mineral species canosioite, ideally Ba2Fe3+(AsO4)2(OH), has been discovered in the dump of Valletta mine, Maira Valley, Cuneo Province, Piedmont, Italy. Its origin is probably related to the reaction between ore minerals and hydrothermal fluids. It occurs in reddish-brown granules, subhedral millimetre-size crystals, with a pale yellow streak and vitreous lustre. Canosioite is associated with aegirine, baryte, calcite, hematite, bronze Mn-bearing muscovite, unidentified Mn oxides and unidentified arsenates. Canosioite is biaxial (+) with a 2Vmeas= 84(2)°. It is weakly pleochroic withX= brownish yellow,Y= brown,Z= reddish brown,Z>Y>X. Canosioite is monoclinic,P21/m, witha= 7.8642(4),b= 6.1083(3),c= 9.1670(5) Å, β = 112.874(6)°,V= 405.73(4) Å3andZ= 2. Calculated density is 4.943 g cm–3. The seven strongest diffraction lines of the observed powder X-ray diffraction pattern are [din Å, (I) (hkl)]: 3.713 (18)(111), 3.304 (100)(211̄), 3.058 (31)(020), 3.047 (59)(103̄), 2.801 (73)(112), 2.337 (24)(220), 2.158 (24)(123̄). Electron microprobe analyses gave (wt.%): Na2O 0.06, MgO 0.43, CaO 0.02, NiO 0.02, CuO 0.03, SrO 0.42, BaO 49.36, PbO 1.69, Al2O31.25, Mn2O33.89, Fe2O36.95, Sb2O30.01, SiO20.03, P2O50.02, V2O510.88, As2O524.64, SO3 0.01, F 0.02, H2O1.61 was calculated on the basis of 1 (OH,F,H2O) group per formula unit. Infrared spectroscopy confirmed the presence of OH. The empirical formula calculated on the basis of 9 O apfu, is (Ba1.92Pb0.05Sr0.02Na0.01)∑2.00(Fe0.523+Mn0.293+Al0.15Mg0.06)∑1.02[(As0.64V0.36)∑1.00O4]2[(OH0.92F0.01)(H2O)0.07]and the ideal formula is Ba2Fe3+(AsO4)2(OH). The crystal structure was solved by direct methods and found to be isostructural to that of arsenbrackebuschite. The structure model was refined (R1= 2.6%) on the basis of 1245 observed reflections. Canosioite is named after the small municipality of Canosio, where the type locality, the Valletta mine, is situated. The new mineral and name were approved by the International Mineralogical Association Commission on New Minerals and Mineral Names (IMA2015-030).

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Badakhshanite-(Y), Y2Mn4Al(Si2B7BeO24), a new mineral species of the perettiite group from a granite miarolic pegmatite in Eastern Pamir, the Gorno Badakhshan Autonomous Oblast, Tajikistan

The Canadian Mineralogist ◽

10.3749/canmin.2000003 ◽

2020 ◽

Vol 58 (3) ◽

pp. 381-394

Author(s):

Leonid A. Pautov ◽

Mirak A. Mirakov ◽

Fernando Cámara ◽

Elena Sokolova ◽

Frank C. Hawthorne ◽

...

Keyword(s):

Crystal Structure ◽

Close Association ◽

Coarse Grained ◽

New Mineral ◽

Orthorhombic Space Group ◽

Calculated Density ◽

Conchoidal Fracture ◽

New Mineral Species ◽

Mohs Hardness ◽

Cation Sites

ABSTRACT Badakhshanite-(Y), ideally Y2Mn4Al(Si2B7BeO24), is a tetrahedral sheet-structure mineral found in the Dorozhny (Road) miarolitic granitic pegmatite within the Kukurt pegmatite field 45 km E of Murghab, Eastern Pamir, Gorno-Badakhshan Autonomous Oblast, Tajikistan. Badakhshanite-(Y) occurs in medium- to coarse-grained non-graphic albite-microcline-quartz pegmatites in close association with smoky quartz, Sc-bearing spessartine, Sc-bearing tusionite, and schorl. It often grows together with Sc-bearing tusionite and occurs as single columnar crystals ranging from 50 to 400 μm in length, as inclusions in spessartine and tourmaline, and rarely as crystals in blebs along boundaries between garnet, tourmaline, and quartz. Badakhshanite-(Y) is yellow brown and has a white streak and a vitreous luster. It is brittle, with a conchoidal fracture, Mohs hardness of 6.5–7, and calculated density of 4.41 g/cm. In thin section it is transparent and pale yellow, non-pleochroic, biaxial (–), with α = 1.805(2), βcalc = 1.827, γ = 1.835(3) (λ = 590 nm); 2V (meas.) = –60(10)°. Dispersion is weak, r > v. Extinction is straight, elongation is negative. FTIR spectra show the absence of (OH) and H2O groups. Chemical analysis by electron microprobe using WDS (6 points), SIMS, and ICP-OES for B and Be gave SiO2 11.96, ThO2 0.12, Sm2O3 0.17, Gd2O3 0.30, Tb2O3 0.10, Dy2O3 0.73, Ho2O3 0.19, Er2O3 1.34, Tm2O3 0.54, Yb2O3 8.82, Lu2O3 2.32, Y2O3 16.60, Sc2O3 1.57, Al2O3 3.06, B2O3 22.06, FeO 0.94, MnO 23.33, CaO 0.58, BeO 2.84, total 97.57 wt.%.The empirical formula based on 24 O apfu is (Y1.21REE0.78Th0.01)Σ2(Mn3.47Y0.34Ca0.11Fe2+0.08)Σ4(Al0.63Sc0.24Fe2+0.06□0.07)Σ1[(Si2.10B6.69Be1.20)Σ9.99O24], where REE = (Yb0.47Lu0.12Dy0.04Er0.07Tm0.03 Ho0.01Gd0.02Sm0.01Tb0.01)Σ0.78. Badakhshanite-(Y) is orthorhombic, space group Pnma, a 12.852(1), b 4.5848(5), c 12.8539(8) Å, V 757.38(7) Å3, Z = 2. The crystal structure was refined to R1 = 4.31% based on 1431 unique [F > 4σF] reflections. In the crystal structure of badakhshanite-(Y), a layer of tetrahedra parallel to (010) is composed of four different tetrahedrally coordinated sites: Si, B(1), B(2), and T (<Si–O> = 1.623 Å, <B(1)–O> = 1.485 Å, <B(2)–O> = 1.479 Å, <T–O> = 1.557 Å), which form four-, five-, and eight-membered rings, having the composition (Si2B7BeO24). Between the sheets of tetrahedra, there are three cation sites: M(1), M(2), and M(3) (<M(1)–O> = 2.346 Å, <M(2)–O> = 2.356 Å, <M(3)–O> = 2.016 Å) occupied by Y(REE), Mn2+(Y, Ca, Fe2+), and Al(Sc), respectively. The M(1,2) sites ideally give Y2Mn4apfu; the M(3) site ideally gives Al apfu. Badakhshanite-(Y) is an Al- and Be-analogue of perettiite-(Y).

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SCHLEMAITE, (Cu, )6(Pb,Bi)Se4, A NEW MINERAL SPECIES FROM NIEDERSCHLEMA ALBERODA, ERZGEBIRGE, GERMANY: DESCRIPTION AND CRYSTAL STRUCTURE

The Canadian Mineralogist ◽

10.2113/gscanmin.41.6.1433 ◽

2003 ◽

Vol 41 (6) ◽

pp. 1433-1444 ◽

Cited By ~ 4

Author(s):

H.-J. Forster ◽

M. A. Cooper ◽

A. C. Roberts ◽

C. J. Stanley ◽

A. J. Criddle ◽

...

Keyword(s):

Crystal Structure ◽

Mineral Species ◽

New Mineral ◽

New Mineral Species

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KIRCHHOFFITE, CsBSi2O6, A NEW MINERAL SPECIES FROM THE DARAI-PIOZ ALKALINE MASSIF, TAJIKISTAN: DESCRIPTION AND CRYSTAL STRUCTURE

The Canadian Mineralogist ◽

10.3749/canmin.50.2.523 ◽

2012 ◽

Vol 50 (2) ◽

pp. 523-529 ◽

Cited By ~ 15

Author(s):

A. A. Agakhanov ◽

L. A. Pautov ◽

V. Y. Karpenko ◽

E. Sokolova ◽

F. C. Hawthorne

Keyword(s):

Crystal Structure ◽

Mineral Species ◽

New Mineral ◽

New Mineral Species ◽

Alkaline Massif

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Hylbrownite, Na3MgP3O10·12H2O, a new triphosphate mineral from the Dome Rock Mine, South Australia: description and crystal structure

Mineralogical Magazine ◽

10.1180/minmag.2013.077.3.11 ◽

2013 ◽

Vol 77 (3) ◽

pp. 385-398 ◽

Cited By ~ 3

Author(s):

P. Elliott ◽

J. Brugger ◽

T. Caradoc-Davies ◽

A. Pring

Keyword(s):

Crystal Structure ◽

Single Crystal ◽

South Australia ◽

New Mineral ◽

Monoclinic Space Group ◽

Thick Sheet ◽

X Ray Diffraction ◽

X Ray ◽

New Mineral Species ◽

Mohs Hardness

AbstractHylbrownite, ideally Na3MgP3O10·12H2O, the second known triphosphate mineral, is a new mineral species from the Dome Rock mine, Boolcoomatta Reserve, Olary Province, South Australia, Australia. The mineral forms aggregates and sprays of crystals up to 0.5 mm across with individual crystals up to 0.12 mm in length and 0.02 mm in width. Crystals are thin prismatic to acicular in habit and are elongate along [001]. Forms observed are {010}, {100}, {001}, {210} and {201}. Crystals are colourless to white, possess a white streak, are transparent, brittle, have a vitreous lustre and are nonfluorescent. The measured density is 1.81(4) g cm−3; Mohs' hardness was not determined. Cleavage is good parallel to {001} and to {100} and the fracture is uneven. Hylbrownite crystals are nonpleochroic, biaxial (−), with α = 1.390(4), β = 1.421(4), γ = 1.446(4) and 2Vcalc. = 82.2°. Hylbrownite is monoclinic, space group P21/n, with a = 14.722(3), b = 9.240(2), c = 15.052(3) Å, β = 90.01(3)°, V = 2047.5(7) Å3, (single-crystal data) and Z = 4. The strongest lines in the powder X-ray diffraction pattern are [d (Å)(I)(hkl)]: 10.530(60)(10,101), 7.357(80)(200), 6.951(100)(11, 111), 4.754(35)(10, 103), 3.934(40)(022), 3.510(45)(30, 303), 3.336(35)(41, 411). Chemical analysis by electron microprobe gave Na2O 16.08, MgO 7.08, CaO 0.43, P2O5 37.60, H2Ocalc 38.45, total 99.64 wt.%. The empirical formula, calculated on the basis of 22 oxygen atoms is Na2.93Mg0.99Ca0.04P2.99O9.97·12.03H2O. The crystal structure was solved from single-crystal X-ray diffraction data using synchrotron radiation (T = 123 K) and refined to R1 = 4.50% on the basis of 2417 observed reflections with F0 > 4 σ(F0). [Mg(H2O)3P3O10] clusters link in the b direction to Naφ6 octahedra, by face and corner sharing. Edge sharing Naφ6 Octahedra and Naφ7 polyhedra form Na2O9 groups which link via corners to form chains along the b direction. Chains link to [Mg(H2O)3P3O10] clusters via corner-sharing in the c direction and form a thick sheet parallel to (100). Sheets are linked in the a direction via hydrogen bonds.

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