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

Mills, S. J., Kampf, A. R., Christy, A. G., Housley, R. M., Rossman, G. R., Reynolds, R. E. and Marty, J. (2014) Bluebellite and mojaveite, two new minerals from the central Mojave Desert, California, USA. Mineralogical Magazine, 78 5: 1325-1340. doi:10.1180/minmag.2014.078.5.15

Author Mills, S. J.
Kampf, A. R.
Christy, A. G.
Housley, R. M.
Rossman, G. R.
Reynolds, R. E.
Marty, J.
Title Bluebellite and mojaveite, two new minerals from the central Mojave Desert, California, USA
Journal name Mineralogical Magazine   Check publisher's open access policy
ISSN 1471-8022
Publication date 2014-10-01
Year available 2014
Sub-type Article (original research)
DOI 10.1180/minmag.2014.078.5.15
Open Access Status Not yet assessed
Volume 78
Issue 5
Start page 1325
End page 1340
Total pages 16
Place of publication Berlin, Germany
Publisher Walter de Gruyter GmbH
Language eng
Subject 1906 Geochemistry and Petrology
Formatted 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 bluish-green plates or flakes up to ∼20 μm × 20 μm × 5 μm 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) Å3 and Z = 3. The eight strongest lines in the powder X-ray diffraction (XRD) pattern are [d obs/Å (I) (hkl)]: 4.427(99)(003), 2.664(35)(211), 2.516(100)(212), 2.213(9)(006), 2.103(29)(033,214), 1.899(47)(312,215), 1.566(48)(140,217) and 1.479(29)(045,143,324).
Keyword Blue Bell Claim
Crystal structure
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth and Environmental Sciences
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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