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Calama 175
Basic information Name: Calama 175
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2019
Country: Chile
Mass:help 184 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 6313 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 17 Oct 2021
Writeuphelp
Writeup from MB 110:

Calama 175        22°29.036’S, 68°50.392’W

Antofagasta, Chile

Find: 18 Oct 2019

Classification: Ordinary chondrite (H4)

History: The meteorite was found on autumn 2019 by Atali Agakhanov during a meteorite searching expedition organized by Timur Kryachko.

Physical characteristics: Total mass is about 184 g. The interior of the meteorite is dark brown whereas the surface is brown to light brown with visible chondrules and metal.

Petrography: (Kseniya A. Konovalova, FMMR). Petrographic observation of a polished section shows that main part of the meteorite contains well-formed chondrules in a coarse-grained matrix. The matrix contains no plagioclase. Chondrules sizes vary from 100 µm to 1 mm (with predominant size 200-500 µm). Metal blebs and troilite are surrounding by rare hydroxides veins (weathering grade is W1). Olivine has no undulatory extinction, indicating a shock stage of S1.

Geochemistry: Mineral composition and Geochemistry: EDS analyses (Atali Agakhanov, Ksenia A. Konovalova, FMMR). Olivine 18.99±0.54 (N=27), Low-Ca pyroxene Fs17.3±0.6Wo0.78±0.19 (N=16), plagioclase Ab88.0An7.9Or3.7 (N=4). Phosphate is Cl-apatite. Composition of kamacite (in wt. %, n = 9): Fe - 90.69, Ni - 6.74, Co - 0.79.

Classification: (Kseniya A. Konovalova, FMMR). Ordinary chondrite. H4, S1, W1.

Specimens: Atali Agakhanov holds main mass. 21.17 g and thin section, FMMR.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:plain
Date:18 Oct 2019
Latitude:22°29.036’S
Longitude:68°50.392’W
Mass (g):184
Pieces:1
Class:H4
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):18.99±0.54 (N=27)
Ferrosilite (mol%):17.3±0.6 (N=16)
Wollastonite (mol%):0.78±0.19 (N=16)
Classifier:Kseniya A. Konovalova, FMMR
Type spec mass (g):21.17
Type spec location:FMMR
Main mass:Atali Agakhanov
Finder:Atali Agakhanov
Comments:Field name is MA003; submitted by Kseniya A. Konovalova, spacelikeyou@yandex.ru
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. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Kseniya Konovalova   
Geography:

Chile
Coordinates:
     Recommended::   (22° 29' 2"S, 68° 50' 24"W)

Statistics:
     This is 1 of 2160 approved meteorites from Antofagasta, Chile (plus 6 unapproved names) (plus 1 impact crater)
     This is 1 of 2189 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater)
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