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Madura Cave
Basic information Name: Madura Cave
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2020
Country: Australia
Mass:help 1072 g
Classification
  history:
Recommended:  L5    [explanation]

This is 1 of 7176 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Jan 2021
Writeuphelp
Writeup from MB 110:

Madura Cave        -31.96557, 126.98438

Western Australia, Australia

Confirmed fall: 19 Jun 2020

Classification: Ordinary chondrite (L5)

History: The Madura Cave fireball was observed by the Desert Fireball Network (DFN) on the morning of 20 June 2020 at 6:05 AM local time, near the border between Western and South Australia. The event lasted 5.5 " beginning at an altitude of 75 km and ending at 18.6 km. From these observations, the meteoroid was likely on an Aten-like orbit prior to colliding with the Earth. A two person team from the DFN was dispatched to scout the fall location, near Madura cave, for an upcoming searching trip. The meteorite was found on the afternoon of the first day, resting on the dirt road that roughly bisected the fall zone.

Physical characteristics: Madura Cave fell as a single stone with the rough dimensions 11 × 9 × 8 cm. The surface is entirely covered by a matte black fusion crust, with some areas appearing to be slightly brown. A small chip on a corner of the rock reveals a light-gray interior. There appears to be no terrestrial alteration in the sample.

Petrography: Based on inspection of a polished thick section, the texture is typical of an ordinary chondrite, with metal, sulfide and silicate (olivine, pyroxene, plagioclase) grains as well as some chondrules randomly distributed throughout the sample. Minor amounts of chromite and phosphates are also present within the sample.

Geochemistry: Olivine compositions range from Fa25.2 to Fa27.2 (Fa26.4±0.4 n=29). Orthopyroxene ranges from Fs22.1Wo1.1 to Fs22.8Wo1.8 (Fs22.4±0.2Wo1.5±0.2 n=29). Chromite compositions range from Cr/Cr+Al = 0.851 to 0.874 (n=17); and Fe/Fe+Mg = 0.859 to 0.894.

Classification: The compositions listed above suggest an L chondrite class. The Wo abundance within the measured OPX indicates a petrologic type 5.

Specimens: Both the main mass (1.072 kg) and a polished thick section are located at WAM.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Western Australia
Origin or pseudonym:Madura Cave
Date:19 Jun 2020
Latitude:-31.96557
Longitude:126.98438
Mass (g):1072
Pieces:1
Class:L5
Weathering grade:W0
Fayalite (mol%):26.4±0.4 (n=29)
Ferrosilite (mol%):22.4±0.2 (n=29)
Wollastonite (mol%):1.5±0.2
Classifier:S. Anderson, G. Benedix, L. Forman, and K. Orr, CUWA
Type spec mass (g):1072
Type spec location:WAM
Main mass:WAM
Finder:The Desert Fireball Network Team
Comments:Submitted by Seamus Anderson
Institutions
   and collections
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)
CUWA: Curtin University, Perth 6845, Western Australia, Australia (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography:

Australia
Coordinates:
     Recommended::   (31° 57' 56"S, 126° 59' 4"E)

Statistics:
     This is 1 of 346 approved meteorites from Western Australia, Australia (plus 1 unapproved name) (plus 11 impact craters)
     This is 1 of 715 approved meteorites from Australia (plus 45 unapproved names) (plus 27 impact craters)
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