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San Juan 116
Basic information Name: San Juan 116
     This is an OFFICIAL meteorite name.
Abbreviation: SJ 116
Observed fall: No
Year found: 2019
Country: Chile
Mass:help 447 g
Classification
  history:
Recommended:  Mesosiderite-C3    [explanation]

This is 1 of 2 approved meteorites classified as Mesosiderite-C3.   [show all]
Search for other: Class C mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 6 May 2021
Writeuphelp
Writeup from MB 110:

San Juan 116 (SJ 116)        25°37.315’S, 69°57.291’W

Antofagasta, Chile

Find: 2019

Classification: Mesosiderite (group C3)

History: Found in the Atacama desert in 2019.

Physical characteristics: An irregular light brown stone without fusion crust.

Petrography: (J. Gattacceca, Bertrand Devouard, CEREGE) Crystalline rock with recrystallized texture. Grain size is about 200 µm, with few larger mineral clasts (to mm). The studied section shows two different lithologies differing mostly by their opaque content. Low-Ca pyroxene is the main mineral, with much lesser amount of olivine. Other minerals: abundant troilite, metal (kamacite and Ni-rich metal, from Fe60Ni40 to Fe45Ni55), chromite. Ilmenite (with TiO2 and chromite exsolutions) and merrilite (to 100 µm) are also found. No plagioclase was observed. Metal, sulphide and chromite are often euhedral. The lithology with higher opaque has 25.3 vol% troilite 6.8 vol% metal (plus 4.5 vol% of metal weathering products), 5.4 vol% chromite with grain size several hundreds µm (point counting, total counts 221). The lithology with lower opaque content has 10.6 vol% sulfide, 1.7 vol% metal, 0.7 vol% chromite with smaller grain size (30 µm for FeS, lower for metal and chromite) .

Geochemistry: Olivine Fa29.1±0.7, FeO/MnO = 44.7±5.9 (n=7). Low-Ca pyroxene Fs26.0±0.3Wo1.8±0.1, FeO/MnO = 29.5±3.2 (n=12). Chromite Cr# = 0.78±0.01 (n=3). Chromite associated to ilmenite has Cr# ~ 1. Ni-rich metal composition range from Fe60Ni40 to Fe45Ni55 (EDS analyses).

Classification: Achondrite (mesosiderite-C3). Group C based on the absence of plagioclase, metamorphic grade 3 based on the recrystallised texture. This meteorites is particularly rich in tetrataenite.

Specimens: Type specimen at CEREGE. Main mass with ArtMet.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Date:2019
Latitude:25°37.315'S
Longitude:69°57.291'W
Mass (g):447
Pieces:1
Class:Mesosiderite-C3
Weathering grade:low
Fayalite (mol%):29.1±0.7 (n=7)
Ferrosilite (mol%):26.0±0.3 (n=12)
Wollastonite (mol%):1.8±0.1
Magnetic suscept.:4.62
Classifier:J. Gattacceca, B. Devouard, CEREGE
Type spec mass (g):39.1
Type spec location:CEREGE
Main mass:ArtMet collection, Poland
Finder:anonymous
Comments:work name H30; submitted by Jérôme Gattacceca
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
ARTMET: Meteorites and Art, Poland (private address; updated 23 Feb 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Jerome Gattacceca      
Geography:

Chile
Coordinates:
     Recommended::   (25° 37' 19"S, 69° 57' 17"W)

Statistics:
     This is 1 of 2063 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 2091 approved meteorites from Chile (plus 12 unapproved names) (plus 1 impact crater)
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