The systhesis and crystal growth of Te(OH)6 · 4 H2O

Falck, L.; Lindqvist, Oliver; Moret, J.; Ribet, J.L.

doi:10.1016/0022-0248(81)90075-0

Cited by 2 publications

(2 citation statements)

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“…%. Mcalpineite is very similar to synthetic Cu3TeO 6 (Bayer, 1967), the structure of which has been described by Hostachy and Coing-Boyat (1968) and by Falck et al (1978) 9 Inspection of the structure of Cu3TeO 6 (atomic coordinates of Falck et al, ibid 9 clearly.shows that there is marginally sufficient room (4 A void) within the structure for the single H20 molecule 9 We suspect that the reduction in symmetry from a body-centred lattice to a primitive lattice may be an attempt by the structure to maximise a stable O. 9149 separation for the H20 molecule.…”

Section: Chemistrymentioning

confidence: 71%

“…They are always present on powder films and are not due to contamination. These lines can be successfully indexed if the body-centred cubic lattice of Cu3TeO6 (space group la3, a = 9.537(1) (Falck et aL, 1978)) is symmetry reduced to a primitive cubic lattice. The retention of cubic symmetry is in accordance with reflectance studies which show that the mineral is isotropic.…”

Section: X-ray Studiesmentioning

confidence: 99%

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Mcalpineite, Cu₃TeO₆·H₂O, a new mineral from the McAlpine mine, Tuolumne County, California, and from the Centennial Eureka mine, Juab County, Utah

Roberts

Ercit²,

Criddle³

et al. 1994

Mineral. mag.

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Mcalpineite, ideally CuaTeO6.H20 , occurs as isolated 0.5 mm-sized emerald green cryptocrystalline crusts on white quartz at the long-abandoned McAlpine mine, Tuolumne County, California, U.S.A. Associated nonmetallic phases are muscovite (mariposite), calcite, goethite, hematite, chlorargyrite, choloalite, keystoneite, mimetite, malachite, azurite, annabergite and a host of unidentified crusts, both crystalline and amorphous. Associated metallic minerals include pyrite, acanthite, hessite, electrum, altaite, native silver, galena, pyrargyrite, sphalerite and owyheeite. The mineral has also been identified at the Centennial Eureka mine, Juab County, Utah, U.S.A., where it occurs as interstitial olive-green coatings and as millimetre-sized dark green-black cryptocrystalline nodules lining drusy quartz vugs. Associated minerals are xocomecatlite, hinsdalite-svanbergite, goethite and several new species including two hydrated copper tellurates, a hydrated copper-zinc tellurate/tellurite, and a hydrated copper-zinc tellurate/tellurite-arsenate-chloride. Mcalpineite is cubic, P-lattice (space group unknown), a = 9.555 (2) A, V = 872.4(4) A. The strongest six lines in the X-ray powder-diffraction pattern [ CHN elemental analyser) 7, total 101.3 wt. %, leading to the empirical formula (Cu2.56Zno.15)~2.71 (Te0.ssSi0.02Aso.o2)~0.92Os.47.1.53H20. The infrared absorption spectrum shows definite bands for structural H20 with an O-H stretching frequency centred at 3320 cm -l and a H-O-H flexing frequency centred at 1600 cm -1. In reflected light Mcalpineite is isotropic, nondescript grey, with ubiquitous brilliant apple to time green internal reflections. The refractive index calculated from Fresnel equations is 2.01. Measured reflectance values in air and in oil are tabulated. Reflectance study also shows that cryptocrystalline aggregates are composed of micron-sized sheaves of fibrous or prismatic crystals. Other physical properties include: adamantine lustre; light green streak; brittle; uneven fracture; translucent to transparent and nonfluorescent under both long-and short-wave ultraviolet light. The name is for the first known locality, the McAlpine mine.

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Section: Chemistrymentioning

confidence: 71%

Section: X-ray Studiesmentioning

confidence: 99%