Skip to Main Content
GEOREF RECORD

Allendeite (Sc (sub 4) Zr (sub 3) O (sub 12) ) and hexamolybdenum (Mo,Ru,Fe), two new minerals from an ultrarefractory inclusion from the Allende Meteorite

Chi Ma, John R. Beckett and George R. Rossman
Allendeite (Sc (sub 4) Zr (sub 3) O (sub 12) ) and hexamolybdenum (Mo,Ru,Fe), two new minerals from an ultrarefractory inclusion from the Allende Meteorite
American Mineralogist (April 2014) 99 (4): 654-666

Abstract

During a nanomineralogy investigation of the Allende meteorite with analytical scanning electron microscopy, two new minerals were discovered; both occur as micro- to nano-crystals in an ultrarefractory inclusion, ACM-1. They are allendeite, Sc (sub 4) Zr (sub 3) O (sub 12) , a new Sc- and Zr-rich oxide; and hexamolybdenum (Mo,Ru,Fe,Ir,Os), a Mo-dominant alloy. Allendeite is trigonal, R3, a = 9.396, c = 8.720, V = 666.7 Aa (super 3) , and Z = 3, with a calculated density of 4.84 g/cm (super 3) via the previously described structure and our observed chemistry. Hexamolybdenum is hexagonal, P6 (sub 3) /mmc, a = 2.7506, c = 4.4318 Aa, V = 29.04 Aa (super 3) , and Z = 2, with a calculated density of 11.90 g/cm (super 3) via the known structure and our observed chemistry. Allendeite is named after the Allende meteorite. The name hexamolybdenum refers to the symmetry (primitive hexagonal) and composition (Mo-rich). The two minerals reflect conditions during early stages of the formation of the Solar System. Allendeite may have been an important ultrarefractory carrier phase linking Zr-,Sc-oxides to the more common Sc-,Zr-enriched pyroxenes in Ca-Al-rich inclusions. Hexamolybdenum is part of a continuum of high-temperature alloys in meteorites supplying a link between Os- and/or Ru-rich and Fe-rich meteoritic alloys. It may be a derivative of the former and a precursor of the latter.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 99
Serial Issue: 4
Title: Allendeite (Sc (sub 4) Zr (sub 3) O (sub 12) ) and hexamolybdenum (Mo,Ru,Fe), two new minerals from an ultrarefractory inclusion from the Allende Meteorite
Affiliation: California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Pages: 654-666
Published: 201404
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 85
Accession Number: 2014-030301
Categories: Mineralogy of non-silicatesPetrology of meteorites and tektites
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201419
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal