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Redcanyonite, (NH (sub 4) ) (sub 2) Mn[(UO (sub 2) ) (sub 4) O (sub 4) (SO (sub 4) ) (sub 2) ](H (sub 2) O) (sub 4) , a new zippeite-group mineral from the Blue Lizard Mine, San Juan County, Utah, USA

Travis A. Olds, Jakub Plasil, Anthony R. Kampf, Peter C. Burns, Barbara P. Nash, Joe Marty, Timothy P. Rose and Shawn M. Carlson
Redcanyonite, (NH (sub 4) ) (sub 2) Mn[(UO (sub 2) ) (sub 4) O (sub 4) (SO (sub 4) ) (sub 2) ](H (sub 2) O) (sub 4) , a new zippeite-group mineral from the Blue Lizard Mine, San Juan County, Utah, USA
Mineralogical Magazine (December 2018) 82 (6): 1261-1275

Abstract

Redcanyonite (IMA2016-082), (NH (sub 4) ) (sub 2) Mn[(UO (sub 2) ) (sub 4) O (sub 4) (SO (sub 4) ) (sub 2) ](H (sub 2) O) (sub 4) , occurs underground in the Blue Lizard mine, Red Canyon, White Canyon district, San Juan County, Utah, USA. It occurs with natrozippeite, brochantite, devilline, posnjakite, johannite, gypsum, bobcookite, pickeringite, pentahydrite and the NH (sub 4) -analogue of zippeite: ammoniozippeite. Redcanyonite occurs as radial aggregates of red-orange needles and blades individually reaching up to 0.2 mm long, with aggregates measuring up to 1 mm in diameter. Crystals are flattened on {010} and elongated along [100], exhibit perfect cleavage on {010}, and exhibit the forms {010}, {001}, {101} and {101}. Twinning is ubiquitous, by 180 degrees rotation on [100]. Redcanyonite is translucent with a pale orange streak, is non-fluorescent, has a Mohs hardness of 2, and has brittle tenacity with uneven fracture. Optically, redcanyonite is biaxial (+), alpha =1.725(3), beta =1.755(3), gamma =1.850(5) (white light); 2V (meas.)=60(2) degrees , 2V (calc.)=61.3 degrees ; and dispersion is r<v, very strong. Pleochroism is: X=orange, Y=yellow and Z=orange; Y<<X<Z. The optical orientation is X=b, Y nearly equal c*, Z nearly equal a. The empirical formula is (NH (sub 4) ) (sub 2.02) (Mn (sub 0.49) Cu (sub 0.09) Zn (sub 0.06) ) (sub Sigma 0.64) H (super +) (sub 0.72) [( UO (sub 2) ) (sub 4) O (sub 4) (S (sub 0.99) P (sub 0.01) O (sub 4) ) (sub 2) ](H (sub 2) O) (sub 4) , based on 4 U and 24 O apfu. Redcanyonite is monoclinic, C2/m, a=8.6572(17), b=14.155(3), c=8.8430(19) Aa, beta =104.117(18) degrees , V=1050.9(4) Aa (super 3) and Z=2. The structure was refined to R (sub 1) =0.0382 for 1079 reflections with I (sub obs) >3sigma I. Uranyl oxo-sulfate sheets in redcanyonite adopt the well-known zippeite topology, which consists of zigzag chains of uranyl pentagonal bipyramids linked by sulfate tetrahedra to form sheets. The sheets are linked to each other through bonds to interlayer NH (super 4+) groups and octahedrally coordinated Mn (super 2+) , and by hydrogen bonds from H (sub 2) O groups. Redcanyonite is named for Red Canyon in southeast Utah, USA.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 82
Serial Issue: 6
Title: Redcanyonite, (NH (sub 4) ) (sub 2) Mn[(UO (sub 2) ) (sub 4) O (sub 4) (SO (sub 4) ) (sub 2) ](H (sub 2) O) (sub 4) , a new zippeite-group mineral from the Blue Lizard Mine, San Juan County, Utah, USA
Affiliation: University of Notre Dame, Department of Civil and Environmental Engineering and Earth Sciences, Notre Dame, ID, United States
Pages: 1261-1275
Published: 201812
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 36
Accession Number: 2019-024179
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables, sketch map
N37°33'26" - N37°33'26", W110°17'44" - W110°17'44"
Secondary Affiliation: Czech Academy of Sciences, Institute of Physics, CZE, Czech RepublicNatural History Museum of Los Angeles County, USA, United StatesUniversity of Utah, USA, United StatesLawrence Livermore National Laboratory, USA, United States
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2019
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