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Toconao 001
Basic information Name: Toconao 001
     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 815 g
Classification
  history:
Recommended:  LL3    [explanation]

This is 1 of 335 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 10 Mar 2020
Writeuphelp
Writeup from MB 109:

Toconao 001        22°58.68’S, 68°18.01’W

Antofagasta, Chile

Find: 26 Mar 2019

Classification: Ordinary chondrite (LL3)

History: The meteorite was found by Mr. T. Kryachko on March 26, 2019, during a visual search for the meteorites in the Atacama desert.

Physical characteristics: The meteorite shows numerous fragments of irregular shape. It is grayish-brown in color, with fusion crust is absent, and chondritic texture visible on the sample surface. Some of the fragments are patchy, covered by salts; some of them are fractured by sub-parallel fracture planes due to weathering processes.

Petrography: (Lorenz C. A.) The meteorite is composed of chondrules of RP, RO, BP, BO, POP, PO and C types. Average chondrule diameter is 486±290 µm (N=280). Minor components are chondrule fragments, mineral grains and essentially fine-grained, non-transparent matrix. The chondrules are well outlined and have sharp contacts with the matrix. Troilite-rich chondrules are widely distributed, silica-rich chondrule was found. The main phases are olivine, pyroxene, troilite and glass; metal is accessory. Several chondrules contain Al-rich clinopyroxene. Olivine has sharp optical extinction. A network of thin veins of weathering products crosses the meteorite.

Geochemistry: Mineral compositions and geochemistry: Olivine: Fa19.4±12.3 (N=70), PMD Fa is 63.2%, CaO 0.01-0.58 wt%; pyroxene Fs8.3±7.6Wo1.2±1.2 (N=30), clinopyroxene Fs15.4±6.1Wo23.4±8.2 (N=6); Al-rich clinopyroxene (wt%, N=22): Al2O3 13.7±4.3; TiO2 0.7±0.4; Cr2O3 0.3±0.3; sulfide is troilite; Total Fe of the meteorite is 19.7 wt% (XRF, T. G. Kuzmina, Vernad).

Classification: Based on a texture, PMD of Fa olivine and total Fe abundance the meteorite is classified as ordinary chondrite of LL group, petrological type 3.

Specimens: Type specimen of 158 g and thin section are on deposit in Vernad. Mr. T. V. Kryachko holds main mass of the meteorite.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Date:26 Mar 2019
Latitude:22°58.68'S
Longitude:68°18.01'W
Mass (g):815
Pieces:Many
Class:LL3
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):19.4±12.3 (N=70)
Ferrosilite (mol%):8.3±7.6 (N=30)
Wollastonite (mol%):1.2±1.2 (N=30)
Classifier:Lorenz C. A., Vernad
Type spec mass (g):158
Type spec location:Vernad.
Main mass:Mr. T. Kryachko, bredfield@mail.ru
Finder:Mr. T. Kryachko
Comments:field name is Calama 5-22; analyst T. Kryachko (Technograd, Moscow); submitted by Lorenz C.A., Vernad
Institutions
   and collections
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Chile
Coordinates:
     Recommended::   (22° 58' 41"S, 68° 18' 1"W)

Statistics:
     This is 1 of 1663 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1691 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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