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Mount Egerton   contributed by Graham Macleod, IMCA 8781   MetBul Link


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View all entries for   Meteorite (1)   Graham Macleod (33)


  Aubrite-an

TKW 22 kg. Fall not observed. Found 1941 Mount Egerton, Gascoyne River, Western Australia.


Graham writes:
These 4 pieces are all Mount Egerton, bought from 2 different sellers (IMCA). The small ones that look layered seem to be the most common but one day I hope to buy a larger stone.

Mt Egerton is located approximately 200 kilometres north-west of Meekatharra, or 80 kilometres east south-east of Mt Augustus, on Woodlands Station, in remote hilly semi arid country. The initial 1.7 kg meteorite fragment was discovered by a local prospector in 1941, 15 kilometres north east of Mt Egerton. Subsequent searches located thousands of small fragments under 1 gram. As a result, this material is found commonly for sale. It is classed as an enstatite chondrite meteorite where enstatite is the primary metal discoloured over time by weathering. The meteorite is composed of centimetre sized enstatite crystals with abundant aubrite. Ni sillicide perryite is present.

The meteorite's metal phase reveals an orientated fine structure of etching similar to a widmanstatten pattern. Within this structure are perryite inclusions embedded in bands of Fe-Ni, enriched with nickel and contain kamacite. The perryite inclusions are found mainly at the intersections of the nickel bands, although some is also found above and below the bands.
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#1

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#3

Found at the arrow (green or red) on the map below

 


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Roman IMCA # 0583
 2/2/2016 5:26:21 PM
Excellent and informative presentation Graham. Looks like the tons of dirty quartzite here in the creeks of Pennsylvania :-)
Graham Macleod
 2/2/2016 1:10:17 AM
Thanks Guy's, When they were first out looking for this meteorite it would be easy to mistake for a small fossilized wood piece.
John Divelbiss
 2/1/2016 10:33:47 AM
Yes Simon, it is a strange Aubrite that looks like a chunk of wood at first glance.
Simon de Boer IMCA 9708
 2/1/2016 6:56:09 AM
Odd looking Aubrite thanks for sharing Graham
 

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