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GEOREF RECORD

Schoellhornite Na (sub 0.3) (H (sub 2) O) (sub 1) [CrS (sub 2) ], a new mineral in the Norton County enstatite achondrite

Akihiko Okada, Klaus Keil, B. F. Leonard and I. D. Hutcheon
Schoellhornite Na (sub 0.3) (H (sub 2) O) (sub 1) [CrS (sub 2) ], a new mineral in the Norton County enstatite achondrite
American Mineralogist (June 1985) 70 (5-6): 638-643

Abstract

Schollhornite, Na (sub 0.3) (H (sub 2) O) (sub 1) (CrS (sub 2) ), possible space groups R3m, R3m, R32; a 3.32, c 26.6 A; D(meas) 2.70 g/cm (super 3) , D(calc) 2.74 g/cm (super 3) , occurs in the Norton County enstatite achondrite as thin bands a few mu m wide in caswellsilverite (NaCrS (sub 2) ) and as individual grains = or <250 mu m in size, adjacent to caswellsilverite. Strongest XRD lines include 8.85(vs), 2.80(m), 2.53(m), 1.67(m) A. In reflected light, schollhornite is grey in air and bluish grey in oil. It has distinct reflection pleochroism: in air, brownish grey (brighter) and bluish grey (darker); in oil, grey with an extremely faint yellowish tint (brighter) and bluish grey (darker). Anisotropism is strong and the phase is uniaxial negative. Associated phases are daubreelite, titanoan troilite, ferromagnesian alabandite, oldhamite, kamacite and perryite. Schollhornite appears to be the terrestrial weathering product of caswellsilverite. This new mineral is named after Robert Schollhorn, in honour of his contributions to the study of synthetic hydrated layered chalcogenides.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 70
Serial Issue: 5-6
Title: Schoellhornite Na (sub 0.3) (H (sub 2) O) (sub 1) [CrS (sub 2) ], a new mineral in the Norton County enstatite achondrite
Affiliation: Univ. N.M., Dep. Geol. and Inst. Meteorites, Albuquerque, NM, United States
Pages: 638-643
Published: 198506
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 16
Accession Number: 1986-022295
Categories: Mineralogy of non-silicatesPetrology of meteorites and tektites
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N39°34'60" - N40°00'00", W100°13'00" - W99°40'00"
N40°00'00" - N43°00'00", W104°04'60" - W95°19'60"
Secondary Affiliation: U. S. Geol. Surv., USA, United StatesUniv. Chic., Enrico Fermi Inst., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1986
Program Name: USGSOPNon-USGS publications with USGS authors
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