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Lake Gwynne
Basic information Name: Lake Gwynne
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2003
Country: Australia
Mass:help 210 g
Classification
  history:
Recommended:  H5    [explanation]

This is 1 of 10209 approved meteorites (plus 18 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 16 Dec 2020
Writeuphelp
Writeup from MB 109:

Lake Gwynne        30°31’57"S, 121°36’27"E

Western Australia, Australia

Find: 2003

Classification: Ordinary chondrite (H5)

History: A single stone was found on the surface.

Physical characteristics: Physical characterisitics: A completely crusted stone.

Petrography: (A. W. R. Bevan, WAM). Indistinct chondrules are set in a moderately crystalline matrix. Chondrule mesostases are devitrified to microcrystalline. Heavily shocked with abundant black veins with mobilized troilite and metal. Olivine shows variable undulose extinction to strong mosaicism and planar fracturing closer to shock veins.

Geochemistry: Mineral compositions and geochemistry: (P. Downes WAM). Mineral compositions as determined by EMP: olivine Fa19; orthopyroxene Fs16.9 Wo1.06; chromite #Cr 85.8; kamacite (average n=8) Ni 6.28%, Co 0.52%. Petrographically and mineralogically similar to Mount Marion found 63.8 km away.

Classification: (H5); S4: W1.

Specimens: Type specimens 23.68 g and thin section WAM. Main mass in possession of finder.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Western Australia
Origin or pseudonym:near Kanowna
Date:2003
Latitude:30°31'57"S
Longitude:121°36'27"E
Mass (g):210
Pieces:1
Class:H5
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):19.0
Ferrosilite (mol%):16.9
Wollastonite (mol%):1.06
Classifier:A. W. R. Bevan, WAM
Type spec mass (g):23.68
Type spec location:WAM
Main mass:In possession of finder
Finder:R. Gadd
Comments:Submitted by L. V. Forman (Curtin University, WAM)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Australia
Coordinates:
     Recommended::   (30° 31' 57"S, 121° 36' 27"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 714 approved meteorites from Australia (plus 45 unapproved names) (plus 27 impact craters)
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