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New wurtzite polytypes from Joplin, Missouri

Howard Tasker Evans and Edwin Thor McKnight
New wurtzite polytypes from Joplin, Missouri
American Mineralogist (November 1959) 44 (11-12): 1210-1218


Small, hemimorphic hexagonal crystals implanted on botryoidal zinc sulfide from the Zig Zag Mine, Joplin, Missouri, have been studied by crystallographic and X-ray diffraction techniques. They are identified as a new wurtzite polytype, wurtzite-10H. The unit cell data are: space group, P6 (sub 3) mc; a = 3.824 Aa, c = 31.20 Aa; cell contents, 10ZnS. Comparison of diffraction intensity data indicates that the published structure of SiC-10H (stacking sequence 3223) is different from that of wurzite-10H. Calculation of intensities for various models shows that the stacking sequence for wurtzite-10H is 55. Crystals of wurtzite from Joplin described by A. F. Rogers were evidently wurtzite-10H. Powder diffraction data revealed the presence of another polytype, wurtzite-8H, with a hexagonal unit cell: space group P6 (sub 3) mc; a = 3.82 Aa, c = 24.96 Aa; cell contents 8ZnS. Wurtzite-6H was also found at the Zig Zag Mine. The wurtzite polytypes evidently form a homologous series (2H, 4H, 6H, 8H, 10H) resulting from growth phenomena based on screw dislocations.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 44
Serial Issue: 11-12
Title: New wurtzite polytypes from Joplin, Missouri
Pages: 1210-1218
Published: 195911
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
Accession Number: 1959-009244
Categories: Mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N36°00'00" - N40°34'60", W95°45'00" - W89°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1959
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