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Mason Gully
Basic information Name: Mason Gully
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes
Year fell: 2010
Country: Australia
Mass:help 24.5 g
Meteoritical Bulletin:  MB 99  (2012)  H5
Recommended:  H5    [explanation]

This is 1 of 8812 approved meteorites (plus 11 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 11 May 2011
Writeup from MB 99:

Mason Gully                 [coordinates temporarily withheld]

Western Australia, Australia

Fell: 13 April 2010 at 10h36m10s UTC

Classification: Ordinary chondrite (H5)

History: A bright fireball was recorded over southwestern Australia by observatories of the Desert Fireball Network. A fall position was pin-pointed by triangulation (Pavel Spurny, CzAS), and a search was mounted (Martin Towner, ICL). A stone was recovered 3rd November 2010 within 150 m of the predicted fall site.

Physical characteristics: (Gretchen Benedix, NHM; Philip Bland, Kathryn Dyl, Martin Towner, ICL). An ~3 cm, 50% fusion crusted, 24.54 g stone was recovered.  Individual pyroxene, olivine, and feldspar crystals are visible on the broken surface, with no evidence of alteration of silicates. Some rust patches visible around metal grains on original broken surfaces. Although the meteorite appears to have high porosity (based on observations of sawn surfaces), metal in the interior shows no sign of alteration. Fusion crust is black and fresh.

Petrography: (Gretchen Benedix, NHM). The meteorite has a typical petrologic type 5 texture, with discernible, but not distinct chondrules. Chondrule types include BO and RP. Minerals are heterogeneously distributed. Modal mineralogy (in vol%) is: olivine 33; orthopyroxene 38; clinopyroxene 5; plagioclase 8; metal 11; sulfide 5; minor components around 1.

Geochemistry: (Gretchen Benedix, NHM; Richard Greenwood, Ian Franchi, Jenny Gibson, OU). Mineral compositions as determined by EMP: olivine, Fa19.2±0.6; low-Ca pyroxene, Fs16.±0.4Wo1.4±0.3; chromite (Fe/Fe+Mg = 0.84; Cr/Cr+Al = 0.86). Oxygen isotopes: δ17O = 3.04‰; δ18O = 4.42‰; Δ17O = 0.74‰.

Classification: Ordinary chondrite (H5), S1, minimal weathering.

Specimens: The stone and one thin section are on deposit at WAM.

Data from:
  Table 0
  Line 0:
State/Prov/County:Western Australia
Origin or pseudonym:Nullarbor Region
Date:13 April 2010
Mass (g):24.54
Fayalite (mol%):19
Ferrosilite (mol%):16
Wollastonite (mol%):1.6
Classifier:G. Benedix, R. Greenwood, I. Franchi, M. Towner, P. Bland, A. Bevan
Type spec mass (g):24.54
Type spec location:WAM
Main mass:WAM
Finder:M Towner
Comments:Submitted by P. Bland, G. Benedix
Plots: O isotopes:  
   and collections
NHM: Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Website (institutional address; updated 9 Dec 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
WAM: Department of Earth & Planetary Sciences, Western Australian Museum. Locked Bag 49, Welshpool DC, Western Australia 6986, Australia; Website (institutional address; updated 18 Oct 2011)
CzAS: Astronomical Institute CAS, Fricova 298, 251 65 Ondrejov, Czech Republic, Czech Republic (institutional address; updated 1 Apr 2015)
ICL: Impacts and Astromaterials Research Centre, Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom (institutional address)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 339 approved meteorites from Western Australia, Australia (plus 1 unapproved name) (plus 11 impact craters)
     This is 1 of 685 approved meteorites from Australia (plus 43 unapproved names) (plus 27 impact craters)

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