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Calama 085
Basic information Name: Calama 085
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2017
Country: Chile
Mass:help 1486 g
Classification
  history:
Recommended:  H(L)3    [explanation]

This is 1 of 3 approved meteorites classified as H(L)3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 9 May 2020
Writeuphelp
Writeup from MB 109:

Calama 085        22°26.854’S, 68°36.489’W

Antofagasta, Chile

Find: 2017 Oct 19

Classification: Ordinary chondrite (H(L)3)

History: One fragment of meteorite (1486 g) was found 24 October 2017 by the UrFU meteorite expedition-2017 in Chile (Pastukhovich A.Yu., Larionov M.Yu., Kruglikov N.A., Kolunin R.N.) near village Chiu-Chiu.

Physical characteristics: Total mass is 1486 g. The meteorite has roughly rounded shape. Exterior of the stone is desert polished. The surface and interior of the meteorite is light to dark brown in color due to Fe-hydroxides. No fusion crust was observed.

Petrography: (K. Dugushkina, RAS-UB) The meteorite has a dark-brown color. The sections show numerous distinct chondrules (average apparent diameter ~400-500 µm, up to 2 mm) in a fine-grained matrix of silicates, metal, and troilite. The meteorite is dominated by porphyritic olivine chondrules (PO) and olivine-pyroxene chondrules (POP). Also present are porphyritic pyroxene (PP), radiating pyroxene (RP), and barred olivine (BO) chondrules. Also chondrite contains accessory apatite and chromite. Heavy oxidation of metal and troilite, 60-95% being replaced (W3). Shock stage is S2/3.

Geochemistry: EDX analyses by K. Dugushkina, RAS-UB. The rock is unequilibrated with a large range in olivine composition (Fa3.7-28.8, N=38). The mean olivine composition is Fa20.3±7.8 and it has a percent mean deviation (PMD for FeO in olivine) of 31%. The chondrite paragenesis, in addition to olivine, includes orthopyroxene En78.6±2.9Fs20.1±2.7Wo1.3±0.5 (N=15), clinopyroxene En47.1±0.7Fs8.6±0.8Wo44.±0.7 (N=5), chromite, apatite, troilite, taenite (Ni 14.3-45.8%) and kamacite (Ni ~6.8%). The average composition of chromite (N=6): Cr2O3 55.3±0.8 wt%, FeO 30.8±0.6 wt%, MgO 3.4±0.4 wt%, Al2O3 5.7±0.4 wt%, TiO2 3.1±0.4 wt%, MnO 0.55±0.1 wt%, SiO2 0.8±0.1 wt%, CaO 0.3±0.5 wt%, NiO 0.2±0.1 wt%.

Classification: Ordinary chondrite, H(L)3, estimated subtype 3.5. Chondrule size closer to the H range, but silicate compositions may indicate L group.

Specimens: 1474.00 g sample and 12.00 g cut-off and thin section UrFU

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:Limestone deflation plain
Date:2017 Oct 19
Latitude:22°26.854'S
Longitude:68°36.489'W
Mass (g):1486
Pieces:1
Class:H(L)3
Shock stage:S2/3
Weathering grade:W3
Fayalite (mol%):20.3±7.8 (N=38)
Ferrosilite (mol%):20.0±2.6 (N=15)
Wollastonite (mol%):1.3±0.5 (N=15)
Classifier:K. Dugushkina, RAS-UB
Type spec mass (g):1486
Type spec location:UrFU
Main mass:UrFU
Finder:UrFU meteorite expedition - Chile-2017
Comments:Field name Krug5; submitted by Kseniya Dugushkina (IGG UB RAS).; submitted by Kseniya Dugushkina (IGG UB RAS) dugushkina.kseniya@mail.ru
Institutions
   and collections
IGG: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China (institutional address; updated 16 Oct 2011)
UrFU: Ural Federal University, 620002, 19 Mira street, Ekaterinburg, Russia (institutional address; updated 14 Jan 2015)
RAS-UB: Zavaritsky Institute of Geology and Geochemistry Russian Academy of Sciences, Ural Branch 15 Akademika Vonsovskogo str., Ekaterinburg, 620016, Russia (institutional address; updated 19 Apr 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Geography:

Chile
Coordinates:
     Recommended::   (22° 26' 51"S, 68° 36' 29"W)

Statistics:
     This is 1 of 1751 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1779 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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