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Trâpeăng Rônoăs
Basic information Name: Trâpeăng Rônoăs
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2010
Country: Cambodia
Mass:help 13 kg
Meteoritical Bulletin:  MB 104  (2015)  H4
Recommended:  H4    [explanation]

This is 1 of 6000 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Sep 2015
Writeup from MB 104:

Trâpeăng Rônăs        11°20’7"N, 104°41’20"E

Kampong Speu, Cambodia

Confirmed fall: 2010 Jul 4

Classification: Ordinary chondrite (H4)

History: At 11:03 a.m. local time on July 4, 2010, Nary Suon and about a dozen of her neighbors and family members were on a lunch break from preparing rice fields for cultivation in Kampong Speu province of Cambodia. They heard a loud boom, and saw dirt and dust fly up into the air. Upon investigation, a large stone (~11.3 kg) was found by Ms. Suon’s nephew Choum Pech in a raised berm between fields, where it had gouged a small hole, at 11°20’7"N and 104°41’20"E, which is about 0.3 km from the town Trâpeăng Rônoăs. A second stone (~1.2 kg), found at 11°21’13"N and 104°42’8"E, and a third stone (~0.5 kg, coordinates unknown), were collected later that day. The two larger stones were stored in a wooden cabinet in a house owned by Ms. Suon in Cambodia. Both stones were used for spiritual rituals by villagers, which involved drinking water that had been repeatedly poured over the stones. Ms. Suon brought the 1.2 kg and 11.3 kg specimens to the U.S. in 2013 and 2015, respectively.

Physical characteristics: The 1.2 kg (1188 g) stone was examined by Cascadia. This stone is a faceted individual, entirely covered with dark fusion crust, except for a small corner where the crust has broken off. There are regmaglypts on two faces, and flow lines curving over a third face. Much of the fusion crust is still glossy, but has patches of weathering visible. Shrinkage cracks form orange-colored traceries against the dark crust.

Petrography: (M. Hutson and A. Ruzicka, Cascadia) In thin section, the sample contains relatively few (5-10%) complete chondrules. Instead, most of the sample shows chondrule fragments, fragments containing parts of more than one chondrule, and individual grains, surrounded by a fairly dark fine-grained matrix. Devitrified glass is fairly common in chondrules and chondrule fragments.

Geochemistry: Olivine (Fa=18.9±0.3, n=33), low-Ca pyroxene (Fs=16.9±0.3, Wo=1.5±0.2, n=32) and plagioclase feldspar (Ab=80.3±1.2, An=13.4±1.0, Or=6.3±1.4, n=23) are all equilibrated.

Classification: Ordinary chondrite (H4). Class and type based on mineral compositions and texture. 27 out of 37 olivine grains examined have uniform extinction, indicating an S1 shock stage. Despite being a fresh fall, there are rims of weathering products on metal grains, comprising ~5% replacement, indicative of a W1 weathering grade. Elevated weathering can be attributed to the sample being kept in a warm, humid climate for three years, and having had water repeatedly poured over it during that time.

Specimens: 54.7 g of the 1.2 kg stone was donated to Cascadia April 22, 2014, where 51.6 g plus a polished thin section and a mount in epoxy are on deposit. The remaining mass of the 1.2 kg specimen and all of the 11.3 kg specimen are currently held by Ms. Suon. The disposition of the smallest stone is unknown.

Data from:
  Table 0
  Line 0:
State/Prov/County:Kampong Speu
Origin or pseudonym:cultivated rice field
Date:2010 Jul 4
Mass (g):13000
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):18.9±0.3
Ferrosilite (mol%):16.9±0.3
Wollastonite (mol%):1.5±0.2
Classifier:M. Hutson, A. Ruzicka, R. Pugh, Cascadia
Type spec mass (g):51.6
Type spec location:Cascadia
Main mass:Nary Suon, Seattle, Washington, USA
Finder:Nary Suon and Choum Pech
Comments:Internal lab number CML 0806.; submitted by A. Ruzicka (Cascadia)
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
John A. Shea   
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     Recommended::   (11° 20' 7"N, 104° 41' 20"E)

     This is the only approved meteorite from Kampong Spoe, Cambodia
     This is 1 of 3 approved meteorites from Cambodia
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