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Dunas de la Soledad
Basic information Name: Dunas de la Soledad
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2015
Country: Mexico
Mass:help 2.52 kg
Classification
  history:
Recommended:  LL5    [explanation]

This is 1 of 3157 approved meteorites (plus 1 unapproved name) classified as LL5.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Jun 2021
Writeuphelp
Writeup from MB 110:

Dunas de la Soledad        28°02.51’N, 114°01.83’W

Baja California, Mexico

Find: 2015

Classification: Ordinary chondrite (LL5)

History: The rock was found in 2015 by Mr. Manuel Melesio Macklish in an area covered with sand dunes called Dunas de la Soledad (also known as Dunas de Don Miguelito), near the pueblo of Guerrero Negro, at the western part of the Baja California and Baja California Sur state border. According to the finder, that has a collection of rocks, the fragment was found during one of his walks as he observed half of the rock protruded from the ground. When lifted, the meteorite felt very heavy, so he decided to bring it to his house. The fragment was recognized as a meteorite in 2020 after Mr. Macklish posted a picture of it in a social network group.

Physical characteristics: The only fragment recovered was covered in about 70% of a dark-reddish fusion crust with different ° of oxidation and a few penetrating fractures with iron oxides, so fracturing is moderate. The fusion crust is mainly smooth with only two sides showing well-developed regmaglypts, while the exposed inner parts are light to dark brown colored and have several rust colored spots of oxidized metal flakes. The buried surface is yellowish-white, and in this area, the fusion crust eroded. It shows some isolated droplets of hygroscopic salts. The pores in the cut surface are empty. The fragment was cut to remove two small slices and, after the cut, measured about 10 × 9 × 8 cm. Together, the main mass and the slices weighed 2524 g.

Petrography: (D. Sheikh, Cascadia; K. Cervantes, CU; G. Gonçalves, USP) Specimen is an ordinary chondrite containing secondary recrystallized feldspar (Av. ~40 µm), kamacite, taenite, chromite, Fe-oxides, merrillite, and troilite. The chondrule size range is 700 to 3500 µm, average size is 1700 µm (N=28). The volume of Fe-Ni alloys grains is ~3 vol% of the rock, almost 40 % of these Fe-Ni grains are covered by iron oxides, while the troilite grains oxidation is not evident; this is consistent with weathering grade W2. Almost 50 % of the olivine grains show mosaicism and planar fractures, consistent with a shock grade S4.

Geochemistry: (D. Sheikh, Cascadia) Olivine (Fa27.1±0.5, range Fa26.4-28.6, n=22), Low-Ca Pyroxene (Fs22.8±0.5Wo1.6±0.2, range Fs22.1-24.4Wo0.9-2.1, n=25).

Classification: Ordinary chondrite (LL5) based on silicate mineral geochemistry and size of secondary recrystallized plagioclase feldspar.

Specimens: Finder: ~2400 g (main mass); CU: 98 g, two polished sections and two thin sections; USP: 18.45 g and one thin section, Cascadia: one thin section.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Baja California
Date:2015
Latitude:28°02.51'N
Longitude:114°01.83'W
Mass (g):2524
Pieces:1
Class:LL5
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):27.1±0.5
Ferrosilite (mol%):22.8±0.5
Wollastonite (mol%):1.6±0.2
Classifier:D. Sheikh, Cascadia; K. Cervantes, CU; G. Gonçalves, USP
Type spec mass (g):98; 18.45
Type spec location:CU; USP
Main mass:Finder
Finder:Mr. Manuel Melesio Macklish
Comments:Submitted by Daniel Sheikh
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
CU: Instituto de Geología (UNAM), Ciudad Universitaria, Apartado Postal 70-296, 04510 México, D.F., Mexico (institutional address; updated 28 Oct 2011)
USP: Miriam Della Posta de Azevedo Museu de Geociências - USP Rua do Lago, 562 CEP: 05508-080 Butantã - SP Brazil, Brazil; Website (institutional address; updated 21 Jan 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Gabriel Gonçalves Silva            
Geography:

Mexico
Coordinates:
     Recommended::   (28° 2' 31"N, 114° 1' 50"W)

Statistics:
     This is 1 of 4 approved meteorites from Baja California, Mexico
     This is 1 of 113 approved meteorites from Mexico (plus 4 unapproved names) (plus 1 impact crater)
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