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Chug Chug 003
Basic information Name: Chug Chug 003
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: Chile
Mass:help 8.92 kg
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 5782 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 15 Sep 2018
Writeuphelp
Writeup from MB 107:

Chug Chug 003        22°29.931’S, 69°8.683’W

Antofagasta, Chile

Find: 2018 Apr 5

Classification: Ordinary chondrite (H4)

History: Meteorite (1 piece 8700 g and 5 small fragments) was found April 5, 2018, by Mikhail Nepomiluev during a meteorite search organized by Timur Kryachko.

Physical characteristics: Total mass is 8918 g. Meteorite has roughly rounded and slightly elongated shape. The surface and interior of the meteorite is light, with dark brown fusion crust up to 2 mm. No fresh glass in fusion crust was observed. Outermost slightly fractured zone is up to 5 mm width. Cracks (up to 0.1 mm in thickness) form a network in this zone.

Petrography: (Pavel Yu. Plechov, FMMR). Petrographic observation of a polished section shows that main part of the meteorite contains well-formed chondrules in the matrix. Chondrules sizes vary from 200 to 600 µm. They have quenched or porphyritic texture, rarely cryptocrystalline, and consist of Ol, Ol+Opx, Ol+Opx+Cpx+Pl. Matrix consists of olivine grains (50-150 µm) and less low-Ca-pyroxene, which is surrounded by cryptocrystalline matrix with a significant amount of tiny (about 1 µm) round drops of metal (kamacite and taenite), chromite and plagioclase. Plagioclase grains (An18.5-41) are less than 5 µm. These features indicate a petrological type of 4. Fresh Fe-Ni metal blebs (up to 300 µm) and troilite (up to 20 µm) occurs in matrix. Metal consists of kamacite surrounded by relatively small grains of taenite and troilite on the boundary with matrix. One elongated area (4 × 7 mm) in the thin section have sharp boundaries with main part of the meteorite. It also consists of chondrules (about 500 µm) and coarse-grained (200-400 µm) Ol-Px matrix. Less metal is in the matrix of the area of a large (2 × 2 mm) metal blob. Olivine has no undulatory extinction, and opaque shock veins and melt pockets are absent, indicating a shock stage of S1. Weathering products (goethite, "hydrogoethite") occur as veins and in situ alteration of FeNi-metals and troilite near meteorite surface. Olivine, pyroxene, chromite, metal and troilite are fresh and not weathered (weathering grade W1). Clinopyroxene, chromite and merrillite (up to 200 µm) occur locally in the matrix.

Geochemistry: Mineral composition and Geochemistry: EDS-WDS analyses (Pavel Yu. Plechov, FMMR). The primary chondrite paragenesis includes olivine Fa19.9±1.6 (N=34), orthopyroxene Fs14.1±3.5Wo1.42±1.26 (N=34), plagioclase Ab62.6An28.8Or6.7 (N=3), Cr-bearing clinopyroxene En48.1Fs6.4Wo45.4 (N=1), chromite Crt77.8±5.93Spl13.2±0.78 (N=3) and merrillite. No Cl-apatite occurred in the meteorite. Merrillite contain (in wt.%, N=6) FeO - 0.28-1.71 wt.%, MgO - 3.52-3.83 and Cl - 0.01-0.02. Composition of kamacite (in wt.%, N=2): Fe 93.3-94.0, Ni 6.2-6.7, Co 0.88. Taenite contain 39.8 wt.% of Ni. Troilite is close to ideal FeS. Rare goethite contains 1.9 wt.% NiO and 0.4 wt.% CoO.

Classification: (Pavel Yu. Plechov, FMMR). Ordinary chondrite. H4, S1, W1.

Specimens: 8700 g, Mikhail Nepomiluev; 198 g (4 pieces), Timur Kryachko, type specimen at FMMR.

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:plain
Date:2018 Apr 5
Latitude:22°29.931'S
Longitude:69°8.683'W
Mass (g):8918
Pieces:6
Class:H4
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):19.86±1.57 (N=34)
Ferrosilite (mol%):14.1±3.5 (N=31)
Wollastonite (mol%):1.42±1.26 (N=31)
Classifier:Pavel Yu. Plechov, FMMR
Type spec mass (g):20
Type spec location:FMMR
Main mass:Mikhail Nepomiluev
Finder:Mikhail Nepomiluev
Comments:Submitted by Pavel Yu. Plechov, pplechov@gmail.com
Institutions
   and collections
FMMR: Fersman Mineralogical Museum, Leninskiy prospekt 18 korpus 2, Moscow, Russia, 119071, Russia; Website (institutional address; updated 24 Feb 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Pavel Plechov      
Geography:

Chile
Coordinates:
     Recommended::   (22° 29' 56"S, 69° 8' 41"W)

Statistics:
     This is 1 of 1453 approved meteorites from Antofagasta, Chile (plus 4 unapproved names) (plus 1 impact crater)
     This is 1 of 1480 approved meteorites from Chile (plus 10 unapproved names) (plus 1 impact crater)
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