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Murrili
Basic information Name: Murrili
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2015
Country: Australia
Mass:help 1680 g
Classification
  history:
Recommended:  H5    [explanation]

This is 1 of 8922 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 31 Mar 2016
Writeuphelp
Writeup from MB 105:

Murrili        29.26089°S, 137.53765°E

South Australia, Australia

Confirmed fall: 2015 Nov 27

Classification: Ordinary chondrite (H5)

History: The Murrili fireball was imaged by observatories of the Desert Fireball Network, and witnessed by local people at William Creek and Maree, as it blazed through the skies of South Australia around 9:15 pm on November 27, 2015. The object encountered the Earth close to its perihelion point, entering the atmosphere at 13.7 km/s. The object stopped ablating at an altitude of 18.32 km over Kati Thanda-Lake Eyre South. Its darkflight and fall position were modelled using a WRF climate model. An initial aerial search (2 weeks after the fall) revealed a small crater-like impact in the surface of the salt lake. The Arabana people are the traditional custodians of this land. Just after Christmas, with their permission and help – two Arabana men assisted with the search – the ground-based search team set out to collect the rock before rain erased evidence of the fall. On New Year’s Eve, a second aerial reconnaissance pinpointed the fall site. After some digging, the meteorite was pulled up through the salt-rich clay mud of the lake.  It was recovered 218 m from the calculated fall line. The meteorite had punched a cylindrical hole through the mud and came to rest 43 cm below the surface.

Physical characteristics: Murrili fell as a single stone with a mass of 1.68 kg measuring approximately 13 × 7 × 6 cm. The mass was originally heart shaped. It is entirely covered with a matte looking fusion crust, aside from one small broken corner revealing a lighter gray interior. Two smaller wedges were cut from the mass for study. The cut surface shows extensive alteration with rusty staining heterogeneously distributed. The alteration does not affect the entire rock, there are areas that preserve the unaltered nature of the meteorite.

Petrography is based on investigations of a small polished thick section, which samples both the altered and unaltered materials in the sample. The overall texture is typical of ordinary chondrites having some chondrules (barred olivine, the remnants of porphyritic olivine, and possible radiating pyroxene) with distinct outlines, as well as large single mineral crystal clasts. Murrili contains olivine, orthopyroxene, plagioclase, metal and sulfide. Phosphate and chromite also occur in minor abundances. Metal and sulfide are randomly distributed throughout the sample. Some metal grains are altered on the edges, but the majority of metal grains are clean. There are fine-grained intergrowths of chromite-plagioclase.

Geochemistry: Olivine composition ranges from Fa18.5 to Fa20.4 (Fa18.8±0.5, n=15). Orthopyroxene ranges from Fs16.1Wo1.8 to Fs16.9W1.1 (Fs16.4±0.3Wo1.1±0.3, n=8). Chromite compositions range from Cr/Cr+Al = 0.850 to 0.868 (n=7); and Fe/Fe+Mg = 0.843 to 0.860.

Classification: The above compositions are consistent with classification at a type H ordinary chondrite. The texture, along with the Wo composition of OPX (Scott et al. 1986) and the chromite composition, indicates a petrologic type of 5.

Specimens: Main Mass is also type specimen at SAM. Two smaller pieces (137.2 g and 86.9 g) plus a cut slab (38.6 g) as well as one polished thick section are held at CUWA with the Desert Fireball Network team.

Bibliography:
  • Scott E.R.D, Taylor G.J. and Keil K. (1986) Accretion, metamorphism, and brecciation of ordinary chondrites: Evidence from petrologic studies of meteorites from Roosevelt County, New Mexico. J. Geophys. Res. 91, issue B13, E115-E123. (link)
Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Lake Eyre
Date:2015 Nov 27
Latitude:29.26089°S
Longitude:137.53765°E
Mass (g):1680
Pieces:1
Class:H5
Shock stage:S1
Fayalite (mol%):18.8±0.5 (n=15)
Ferrosilite (mol%):16.4±0.3 (n=8)
Wollastonite (mol%):1.1±0.3 (n=8)
Classifier:P. Bland, G. Benedix, L. Forman and L. Daly
Type spec mass (g):1355
Type spec location:SAM
Main mass:SAM
Finder:The Desert Fireball Network team
Comments:Pronunciation of the meteorite name is 'Moodalee'; submitted by G. Benedix
Institutions
   and collections
SAM: Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia; Website (institutional address; updated 18 Oct 2011)
CUWA: Curtin University, Perth 6845, Western Australia, Australia (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, in preparation (2016)
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Geography:

Australia
Coordinates:
     Recommended::   (29° 15' 39"S, 137° 32' 16"E)

Statistics:
     This is 1 of 216 approved meteorites from South Australia, Australia (plus 4 impact craters)
     This is 1 of 685 approved meteorites from Australia (plus 43 unapproved names) (plus 27 impact craters)
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