Meierite, A New Barium Mineral With A Kfi-Type Zeolite Framework From the Gun Claim, Yukon Canada

Peterson, Ronald C.; Färber, Gunnar; Evans, Russ; Groat, Lee A.; MacNeil, Laura; Joy, Brian; Lafuente, B.; Witzke, Thomas

doi:10.3749/canmin.1400101

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…The Gun Claim (sometimes also written Gunn Claim), Yukon Territory (130°0′51″W, 62°50′50″N), Canada is located ~4 km southeast of Wilson lake and 16 km southeast of Itsy Peak. It is the type locality for itsiite (Kampf et al , 2014), meierite (Peterson et al , 2016), pellyite (Montgomery et al ., 1972) and the co-type locality of titantaramellite (Alfors and Pabst, 1984). The mineralisation is a barium-rich low-temperature skarn related to a porphyritic quartz monzonite stock.…”

Section: Introductionmentioning

confidence: 99%

Bavsiite, Ba₂V₂O₂[Si₄O₁₂], mineral data and crystal structure

Bojar

Walter

Baumgartner

2019

MinMag

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Bavsiite from the type locality Gun Claim, Yukon Territory, Canada, occurs as millimetre-sized sky-blue platy crystals in a barium-rich low-temperature skarn related to a porphyritic quartz monzonite stock. Associated minerals are alstonite, baryte, celsian, diopside, fresnoite, mica, suzukiite, walstromite, witherite and minerals of the cerchiaraite group. Bavsiite is optical uniaxial (+), with ω = 1.725(3) and ε = 1.750(3) (589 nm) and pleochroic. Electron microprobe analyses yielded the empirical formula Na0.02Ba1.98Ti0.16Fe2+0.03V4+1.80 Al0.05Si4.00O14 based on 14 oxygen atoms, the simplified chemical formula is Ba2V2Si4O14. Bavsiite is tetragonal, space group I4/m, a = 7.043(1), c = 11.444(2) Å and Z = 2 obtained from single crystal data at 100 K, which are in good agreement with cell parameters from powder diffraction data at 293 K: a = 7.051(1) Å and c = 11.470(1) Å. The eight strongest lines of the powder X-ray diffraction pattern are [d, Å (I,%)(hkl)]: 3.76(30)(112), 3.36(44)(013), 3.004(100)(022), 2.493(43)(220), 2.486(67)(114), 2.286(24)(222), 1.785(39)(116) and 1.763(25)(040). The crystal structure was refined to R = 0.0159 based upon 312 unique reflections with I > 2σ(I). The crystal structure of bavsiite comprises unbranched single [Si4O12]8– rings connected by [VO5]6– square pyramids and BaO12 polyhedra. It can also be considered as cage–like [Si4V2O18]12– clusters built by four SiO4 tetrahedra and two VO5 square pyramids. These clusters are cross–linked to form a pseudo-two-dimensional network (2D) parallel to (001) containing empty channels along the a axis and the 2D networks held together by Ba2+ ions located in channels parallel to the c axis. The structural formula is Ba2V2O2[Si4O12]. Bavsiite is polymorphic to suzukiite, BaVSi2O7, which is orthorhombic.

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Section: Introductionmentioning

confidence: 99%

Bavsiite, Ba₂V₂O₂[Si₄O₁₂], mineral data and crystal structure

Bojar

Walter

Baumgartner

2019

MinMag

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Walstromite, BaCa2(Si3O9), from Rankinite Paralava within Gehlenite Hornfels of the Hatrurim Basin, Negev Desert, Israel

et al. 2020

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Walstromite, BaCa2Si3O9, known only from metamorphic rocks of North America, was found in small veins of unusual rankinite paralava within gehlenite hornfelses of the Hatrurim Complex, Israel. It was detected at two localities—Gurim Anticline and Zuk Tamrur, Hatrurim Basin, Negev Desert. The structure of Israeli walstromite [with P 1 ¯ space group and cell parameters a = 6.74874(10) Å, b = 9.62922(11) Å, c = 6.69994(12) Å, α = 69.6585(13)°, β = 102.3446(14)°, γ = 96.8782(11)°, Z = 2, V = 398.314(11) Å3] is analogous to the structure of walstromite from type locality—Rush Creek, eastern Fresno County, California, USA. The Raman spectra of all tree minerals exhibit bands related to stretching symmetric vibrations of Si-O-Si at 650–660 cm−1 and Si-O at 960–990 cm−1 in three-membered rings (Si3O9)6−. This new genetic pyrometamorphic type of walstromite forms out of the differentiated melt portions enriched in Ba, V, S, P, U, K, Na, Ti and F, a residuum after crystallization of rock-forming minerals of the paralava (rankinite, gehlenite-åkermanite-alumoåkermanite, schorlomite-andradite series and wollastonite). Walstromite associates with other Ba-minerals, also products of the residual melt crystallization as zadovite, BaCa6[(SiO4)(PO4)](PO4)2F and gurimite, Ba3(VO4)2. The genesis of unusual barium mineralization in rankinite paralava is discussed. Walstromite is isostructural with minerals—margarosanite, BaCa2Si3O9 and breyite, CaCa2(Si3O9), discovered in 2018.

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Meierite, A New Barium Mineral With A Kfi-Type Zeolite Framework From the Gun Claim, Yukon Canada

Cited by 2 publications

References 21 publications

Bavsiite, Ba₂V₂O₂[Si₄O₁₂], mineral data and crystal structure

Bavsiite, Ba₂V₂O₂[Si₄O₁₂], mineral data and crystal structure

Walstromite, BaCa2(Si3O9), from Rankinite Paralava within Gehlenite Hornfels of the Hatrurim Basin, Negev Desert, Israel

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Meierite, A New Barium Mineral With A Kfi-Type Zeolite Framework From the Gun Claim, Yukon Canada

Cited by 2 publications

References 21 publications

Bavsiite, Ba2V2O2[Si4O12], mineral data and crystal structure

Bavsiite, Ba2V2O2[Si4O12], mineral data and crystal structure

Walstromite, BaCa2(Si3O9), from Rankinite Paralava within Gehlenite Hornfels of the Hatrurim Basin, Negev Desert, Israel

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Bavsiite, Ba₂V₂O₂[Si₄O₁₂], mineral data and crystal structure

Bavsiite, Ba₂V₂O₂[Si₄O₁₂], mineral data and crystal structure