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Greenlizardite, (NH (sub 4) )Na(UO (sub 2) ) (sub 2) (SO (sub 4) ) (sub 2) (OH) (sub 2) .4H (sub 2) O, a new mineral with phosphuranylite-type uranyl sulfate sheets from Red Canyon, San Juan County, Utah, USA

Anthony R. Kampf, Jakub Plasil, Barbara P. Nash and Joe Marty
Greenlizardite, (NH (sub 4) )Na(UO (sub 2) ) (sub 2) (SO (sub 4) ) (sub 2) (OH) (sub 2) .4H (sub 2) O, a new mineral with phosphuranylite-type uranyl sulfate sheets from Red Canyon, San Juan County, Utah, USA
Mineralogical Magazine (April 2018) 82 (2): 401-411

Abstract

The new mineral greenlizardite (IMA2017-001), (NH (sub 4) )Na(UO (sub 2) ) (sub 2) (SO (sub 4) ) (sub 2) (OH) (sub 2) .4H (sub 2) O, was found in the Green Lizard mine, Red Canyon, San Juan County, Utah, USA, where it occurs as a secondary alteration phase. It is associated with ammoniozippeite, boussingaultite and dickite. It forms as light green-yellow blades up to approximately 0.3 mm long. The mineral is vitreous and transparent with a white streak. It fluoresces greenish blue in 405 nm light. Mohs hardness is approximately 2. Crystals are brittle with irregular fracture and two cleavages: perfect {001} and good {210}. Greenlizardite is easily soluble in room-temperature H (sub 2) O. The calculated density is 3.469 g cm-3. Optically, it is biaxial (+) with alpha = 1.559(1), beta = 1.582(1) and gamma = 1.608(1) (measured in white light). The measured 2V is 88(1) degrees ; the calculated 2V is 87.8 degrees . Dispersion is moderate, r < v. Pleochroism is X = very pale yellow green, Y = pale yellow green and Z = light yellow green; X < Y < Z. The optical orientation is X nearly equal c, Y nearly equal a and Z nearly equal b*. The Raman spectrum exhibits bands attributable to both sulfate and uranyl groups. Electron probe microanalyses (with H (sub 2) O based on the crystal structure) yielded (NH (sub 4) ) (sub 0.98) Na (sub 1.00) U (sub 1.96) S (sub 2.04) O (sub 18.00) H (sub 10.02) . Greenlizardite is triclinic, P1, a = 6.83617(17), b = 9.5127(3), c = 13.8979(10) Aa, alpha = 98.636(7), beta = 93.713(7), gamma = 110.102(8) degrees , V = 832.49(8) Aa (super 3) and Z = 2. The crystal structure (R1 = 2.39% for 2542 I > 2sigma I) contains edge-sharing dimers of UO7 pentagonal bipyramids. The dimers link by sharing corners with SO (sub 4) groups to form a [(UO (sub 2) )2(SO (sub 4) ) (sub 2) (OH) (sub 2) ] (sub 2) (super -) sheet based on the phosphuranylite anion topology. Zig-zag edge-sharing chains of NaO (sub 6) octahedra link adjacent [(UO (sub 2) ) (sub 2) (SO (sub 4) ) (sub 2) (OH) (sub 2) ] (sub 2) (super -) sheets, forming thick slabs. NH (sub 4) bonds to O atoms in adjacent slabs linking them together. H (sub 2) O groups occupy channels in the slabs and space between the slabs.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 82
Serial Issue: 2
Title: Greenlizardite, (NH (sub 4) )Na(UO (sub 2) ) (sub 2) (SO (sub 4) ) (sub 2) (OH) (sub 2) .4H (sub 2) O, a new mineral with phosphuranylite-type uranyl sulfate sheets from Red Canyon, San Juan County, Utah, USA
Affiliation: Natural History Museum of Los Angeles County, Department of Mineral Sciences, Los Angeles, CA, United States
Pages: 401-411
Published: 201804
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 230
Accession Number: 2018-081724
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N37°00'00" - N38°30'00", W111°13'00" - W109°02'60"
Secondary Affiliation: Czech Academy of Sciences, Institute of Physics, CZE, Czech RepublicUniversity of Utah, USA, United States
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2018
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