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Bluebellite and mojaveite, two new minerals from the central Mojave Desert, California, USA

Published online by Cambridge University Press:  05 July 2018

S. J. Mills ,
A. R. Kampf ,
A. G. Christy ,
R. M. Housley ,
G. R. Rossman ,
R. E. Reynolds  and
J. Marty
S. J. Mills*
Affiliation:
Geosciences, Museum Victoria, GPO Box 666, Melbourne 3001, Victoria, Australia
A. R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA
A. G. Christy
Affiliation:
Centre for Advanced Microscopy, Australian National University, Canberra, ACT 0200, Australia
R. M. Housley
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
G. R. Rossman
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
R. E. Reynolds
Affiliation:
220 South Buena Vista Street, Redlands, CA 92373, USA
J. Marty
Affiliation:
5199 E. Silver Oak Road, Salt Lake City, UT 84108, USA
*
* E-mail: [email protected]
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Abstract

Bluebellite, Cu6[I5+O3(OH)3](OH)7Cl and mojaveite, Cu6[Te6+O4(OH)2](OH)7Cl, are new secondary copper minerals from the Mojave Desert. The type locality for bluebellite is the D shaft, Blue Bell claims, near Baker, San Bernardino County, California, while cotype localities for mojaveite are the E pit at Blue Bell claims and also the Bird Nest drift, Otto Mountain, also near Baker. The two minerals are very similar in their properties. Bluebellite is associated particularly with murdochite, but also with calcite, fluorite, hemimorphite and rarely dioptase in a highly siliceous hornfels. It forms bright bluishgreen plates or flakes up to ~20 mm 620 mm 65 mm in size that are usually curved. The streak is pale bluish green and the lustre is adamantine, but often appears dull because of surface roughness. It is non-fluorescent. Bluebellite is very soft (Mohs hardness ~1), sectile, has perfect cleavage on {001} and an irregular fracture. The calculated density based on the empirical formula is 4.746 g cm–3. Bluebellite is uniaxial (–), with mean refractive index estimated as 1.96 from the Gladstone-Dale relationship. It is pleochroic O (bluish green) >> E (nearly colourless). Electron microprobe analyses gave the empirical formula Cu5.82I0.99Al0.02Si0.12O3.11(OH)9.80Cl1.09 based on 14 (O+Cl) a.p.f.u. The Raman spectrum shows strong iodate-related bands at 680, 611 and 254 cm–1. Bluebellite is trigonal, space group R3, with the unit-cell parameters: a = 8.3017(5), c = 13.259(1) Å , V = 791.4(1) Å 3 and Z = 3. The eight strongest lines in the powder X-ray diffraction (XRD) pattern are [dobs/Å (I) (hkl)]: 4.427(99)(003), 2.664(35)(211), 2.516(100)(21), 2.213(9)(006), 2.103(29)(033,214), 1.899(47)(312,21), 1.566(48)(140,217) and 1.479(29)(045,14,324).

Mojaveite occurs at the Blue Bell claims in direct association with cerussite, chlorargyrite, chrysocolla, hemimorphite, kettnerite, perite, quartz and wulfenite, while at the Bird Nest drift, it is associated with andradite, chrysocolla, cerussite, burckhardtite, galena, goethite, khinite, mcalpineite, thorneite, timroseite, paratimroseite, quartz and wulfenite. It has also been found at the Aga mine, Otto Mountain, with cerussite, chrysocolla, khinite, perite and quartz. Mojaveite occurs as irregular aggregates of greenish-blue plates flattened on {001} and often curved, which rarely show a hexagonal outline, and also occurs as compact balls, from sky blue to medium greenish blue in colour. Aggregates and balls are up to 0.5 mm in size. The streak of mojaveite is pale greenish blue, while the lustre may be adamantine, pearly or dull, and it is non-fluorescent. The Mohs hardness is ~1. It is sectile, with perfect cleavage on {001} and an irregular fracture. The calculated density is 4.886 g cm–3, based on the empirical formulae and unit-cell dimensions. Mojaveite is uniaxial (–), with mean refractive index estimated as 1.95 from the Gladstone-Dale relationship. It is pleochroic O (greenish blue) >> E (light greenish blue). The empirical formula for mojaveite, based on 14 (O+Cl) a.p.f.u., is Cu5.92Te1.00Pb0.08Bi0.01O4(OH)8.94Cl1.06. The most intense Raman bands occur at 694, 654 (poorly resolved), 624, 611 and 254 cm–1. Mojaveite is trigonal, space group R3, with the unit-cell parameters: a = 8.316(2), c = 13.202(6) Å and V = 790.7(1) Å 3. The eight strongest lines in the powder XRD pattern are [dobs/Å (I) (hkl)]: 4.403(91)(003), 2.672(28)(211), 2.512(100)(21), 2.110(27)(033,214), 1.889(34)(312,21,22), 1.570(39)(404,140,217), 1.481(34)(045,14,324) and 1.338(14)(422). Diffraction data could not be refined, but stoichiometries and unit-cell parameters imply that bluebellite and mojaveite are very similar in crystal structure. Structure models that satisfy bondvalence requirements are presented that are based on stackings of brucite-like Cu6MX14 layers, where M = (I or Te) and X = (O, OH and Cl). Bluebellite and mojaveite provide a rare instance of isotypy between an iodate containing I5+ with a stereoactive lone electron pair and a tellurate containing Te6+ with no lone pair.

Keywords

Bluebellitemojaveitenew mineraliodatetelluratecrystal structureRaman spectroscopyOtto MountainBlue Bell ClaimCalifornia.
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 5 , October 2014 , pp. 1325 - 1340
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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References

Brese, N.E., and O’Keeffe, M. (1991) Bond-valence parameters for solids. Acta Crystallographica, B47, 192–197.CrossRefGoogle Scholar
Crowley, J.A., (1977) Minerals of the Blue Bell mine, San Bernardino County, California. Mineralogical Record, 8, 494–496, 518.Google Scholar
Dunning, G.E., Hadley, T.A., Christy, A.G., Magnasco, J. and Cooper, J.F. Jr., (2005) The Clear Creek mine, San Benito County, California - A unique mercury locality. Mineralogical Record, 36, 337–363.Google Scholar
Frost, R.L., (2009) Tlapallite H6(Ca,Pb)2(Cu,Zn)3SO4 (TeO3)4TeO6, a multi-anion mineral: a Raman spectroscopic study. Spectrochimica Acta, Part A, 72, 903–906.CrossRefGoogle Scholar
Frost, R.L., and Keeffe, E.C., (2009a) Raman spectroscopic study of the mixed anion mineral yecoraite, Bi5Fe3O9(Te4+O3)(Te6+O4)2·9H2O. Journal of Raman Spectroscopy, 40, 1117–1120.CrossRefGoogle Scholar
Frost, R.L., and Keeffe, E.C., (2009b) Raman spectroscopic study of kuranakhite PbMn4+Te6+O6 – a rare tellurate mineral. Journal of Raman Spectroscopy, 40, 249–252.CrossRefGoogle Scholar
Girase, K., Sawant, D.K., Patil, H.M., and Bhavsar, D.S., (2013) Thermal F.I., and Raman spectral analysis of Cu(II)-doped lead iodate crystals. Journal of Thermal Analysis and Calorimetry, 111, 267–271.CrossRefGoogle Scholar
Hawthorne, F.C., and Cooper, M.A., (2013) The crystal structure of chalcoalumite: mechanisms of Jahn- Teller-driven distortion in [6]Cu2+-containing oxysalts. Mineralogical Magazine, 77, 2901–2912.CrossRefGoogle Scholar
Hawthorne, F.C., and Schindler, M. (2000) Topological enumeration of decorated [Cu2+j2]N sheets in hydroxy-hydrated copper-oxysalt minerals. The Canadian Mineralogist, 38, 751–761.CrossRefGoogle Scholar
Hawthorne, F.C., Kimata, M. and Eby, R.K., (1993) The crystal structure of spangolite, a complex copper sulfate sheet mineral. American Mineralogist, 78, 649–652.Google Scholar
Housley, R.M., Kampf, A.R., Mills, S.J., Marty, J. and Thorne, B. (2011) The remarkable occurrence of rare secondary tellurium minerals at Otto Mountain near Baker, California – including seven new species. Rocks and Minerals, 86, 132–142.CrossRefGoogle Scholar
Kampf, A.R., and Housle y , R.M. (2011) Fluorphosphohedyphane, Ca2Pb3(PO4)3F, the first apatite supergroup mineral with essential Pb and F. American Mineralogist, 96, 423–429.CrossRefGoogle Scholar
Kampf, A.R., Rossman, G.R., and Housley, R.M., (2009) Plumbophyllite, a new species from the Blue Bell claims near Baker, San Bernardino County, California. American Mineralogist, 94, 1198–1204.CrossRefGoogle Scholar
Kampf, A.R., Housley, R.M., Mills, S.J., Marty, J. and Thorne, B. (2010a) Lead–tellurium oxysalts from Otto Mountain near Baker, California: I. Ottoite, Pb2TeO5, a new mineral with chains of tellurate octahedra. American Mineralogist, 95, 1329–1336.CrossRefGoogle Scholar
Kampf, A.R., Marty, J. and Thorne, B. (2010b) Leadtellurium oxysalts from Otto Mountain near Baker, California: II. Housleyite, Pb6CuTe4TeO18(OH)2, a new mineral with Cu–Te octahedral sheets. American Mineralogist, 95, 1337–1342.CrossRefGoogle Scholar
Kampf, A.R., Housley, R.M., and Marty, J. (2010c) Leadtellurium oxysalts from Otto Mountain near Baker, California: III. Thorneite, Pb6(Te2O10)(CO3) Cl2(H2O), the first mineral with edge-sharing octahedral dimers. American Mineralogist, 95, 1548–1553.CrossRefGoogle Scholar
Kampf, A.R., Mills, S.J., Housley, R.M., Marty, J. and Thorne, B. (2010d) Lead–tellurium oxysalts from Otto Mountain near Baker, California: IV. Markcooperite, Pb2(UO2)Te6+O6, the first natural uranyl tellurate. American Mineralogist, 95, 1554–1559.CrossRefGoogle Scholar
Kampf, A.R., Mills, S.J., Housley, RM., Marty, J. and Thorne, B. (2010e) Lead–tellurium oxysalts from Otto Mountain near Baker, California: V. Timroseite, Pb2Cu2+ 5 (Te6+O6)2(OH)2, and paratimroseite, Pb2Cu2+ 4 (Te6+O6)2(H2O)2, new minerals with edge-sharing Cu–Te octahedral chains. American Mineralogist, 95, 1560–1568.CrossRefGoogle Scholar
Kampf, A.R., Mills, S.J., Housley, R.M., Marty, J. and Thorne, B. (2010f) Lead–tellurium oxysalts from Otto Mountain near Baker, California: VI. Telluroperite, Pb3Te4+O4Cl2, the Te analogue of perite and nadorite. American Mineralogist, 95, 1569–1573.CrossRefGoogle Scholar
Kampf, A.R., Mills, S.J., Housley, R.M., Rumsey, M.S., and Spratt, J. (2012a) Lead–tellurium oxysalts from Otto Mountain near Baker, California: VII. Chromschieffelinite, Pb10Te6O20(CrO4)(H2O)5, the chromate analogue of schieffelinite. American Mineralogist, 97, 212–219.CrossRefGoogle Scholar
Kampf, A.R., Mills, S.J., Housley, R.M., Bottrill, R.S., and Kolitsch, U. (2012b) Reynoldsite, Pb2Mn4+ 2 O5(CrO4), a new phyllomanganate-chromate from the Blue Bell claims, California and the Red Lead mine, Tasmania. American Mineralogist, 97, 1187–1192.CrossRefGoogle Scholar
Kampf, A.R., Mills, S.J., Housley, R.M., and Marty, J. (2013a) Lead–tellurium oxysalts from Otto Mountain near Baker, California: VIII. Fuettererite, Pb3Cu2+ 6 Te6+O6(OH)7Cl5, a new mineral with double spangolite-type sheets. American Mineralogist, 97, 506–511.CrossRefGoogle Scholar
Kampf, A.R., Mills, S.J., Housley, R.M., and Marty, J. (2013b) Lead-tellurium oxysalts from Otto Mountain near Baker, California: IX. Agaite, Pb3Cu2+Te6+O5 (OH)2(CO3), a new mineral with CuO5–TeO6 polyhedral sheets. American Mineralogist, 97, 512–517.CrossRefGoogle Scholar
Kampf, A.R., Mills, S.J., Housley, R.M., Rossman, G.R., Marty, J. and Thorne, B. (2013c) Leadtellurium oxysalts from Otto Mountain near Baker, California: X. Bairdite, Pb2Cu2+ 4 Te6+ 2 O10(OH)2 (SO4)·H2O, a new mineral with thick HCP layers. American Mineralogist, 97, 1315–1321.CrossRefGoogle Scholar
Kampf, A.R., Mills, S.J., Housley, R.M., Rossman, G.R., Marty, J. and Thorne, B. (2013d) Leadtellurium oxysalts from Otto Mountain near Baker, California: XI. Eckhardite, (Ca,Pb)Cu2+Te6+O5 (H2O), a new mineral with HCP stair-step layers. American Mineralogist, 98, 1617–1623.CrossRefGoogle Scholar
Maroni, V.A., and Hathaway, E.J., (1972) Laser Raman studies of the iodate ion in molten nitrate solutions. Journal of Inorganic and Nuclear Chemistry, 34, 3049–3053.CrossRefGoogle Scholar
Maynard, M.F., Valenti, A., Jenkins, J., Jenkins, F., Hall, D., Hall, J., White, B., White, S., Mansfield, M. and Mansfield, E. (1984) The Blue Bell Claims. San Bernardino County Museum Special Publication, San Bernardino County Museum, San Bernardino, California, USA.Google Scholar
Mills, S.J., and Christy, A.G., (2013) Revised values of the bond valence parameters for TeIV–O, TeVI–O and TeIV–Cl. Acta Crystallographica, B69, 145–149.CrossRefGoogle Scholar
Mills, S.J., Kampf, A.R., Kolitsch, U., Housley, R.M., and Raudsepp, M. (2010) The crystal chemistry and crystal structure of kuksite, Pb3Zn3Te6+P2O14, and a note on the crystal structure of yafsoanite, (Ca,Pb)3Zn(TeO6)2 . American Mineralogist, 95, 933–938.CrossRefGoogle Scholar
Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T. and Colombo, F. (2012) Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289–1336.CrossRefGoogle Scholar
Mills, S.J., Kampf, A.R., Christy, A.G., Housley, R.M., Rossman, G.R., and Marty, J. (2014a) Mojaveite, IMA 2013-120. CNMNC Newsletter No. 20, June 2014, page 550. Mineralogical Magazine, 78, 549–558.Google Scholar
Mills, S.J., Kampf, A.R., Christy, A.G., Housley, R.M., Rossman, G.R., and Reynolds, R.R., (2014b) Bluebellite, IMA 2013-121. CNMNC Newsletter No. 20, June 2014, page 550. Mineralogical Magazine, 78, 549–558.Google Scholar
Schellenschläger, V., Pracht, G. and Lutz, H.D., (2001) Single-crystal Raman studies on nickel iodate dihydate, Ni(IO3)2·2H2O. Journal of Raman Spectroscopy, 32, 373–382.CrossRefGoogle Scholar
Walker, J.D., Martin, M.W., and Glazner, A.F., (2002) Late Paleozoic to Mesozoic development of the Mojave Desert and environs, California. Pp. 1–18 in: Geologic Evolution of the Mojave Desert and Southwestern Basin and Range (A.F. Glazner, J.D., Walker and J.M. Bartley, (editors). Geological Society of America Memoir, 195. Geological Society of America, Boulder, Colorado, USA.Google Scholar