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La Ciénega (b)
Basic information Name: La Ciénega (b)
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2014
Country: Mexico
Mass:help 6.14 kg
Meteoritical Bulletin:  MB 105  (2016)  L6
Recommended:  L6    [explanation]

This is 1 of 12058 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 24 Sep 2016
Writeup from MB 105:

La Ciénega (b)        30°12’03.5"N, 111°56’24.97"W

Sonora, Mexico

Find: 2014 Jan 30

Classification: Ordinary chondrite (L6)

History: On the 30 January 2014, Hugo Lino was prospecting for gold near the abandoned mining community of La Ciénega in Sonora, Mexico, and found a 6143 g, fusion crusted meteorite. The stone was subsequently purchased by Michael Farmer.

Physical characteristics: A relatively fresh fusion crusted rounded stone with a few broad regmaglypts. Sawn surface is largely light colored with scattered rust staining around metal grains. Metal evenly distributed with grains to 2 mm. Chondrules difficult to recognize, with one to 4 mm.

Petrography: (L. Garvie, ASU) This section shows that the stone is largely recrystallized with difficult-to-recognize chondrules, including BO, PO, and RP. Many olivine grains with planar fractures. Plagioclase abundant and often >100 μm. Chromite irregularly shaped, to 600 μm. Kamacite irregularly shaped with weakly developed Neumann bands; some grains polycrystalline. Metal grains of tetrataenite rims and cores of dark-etching plessite or acicular kamacite common. Troilite largely single crystal and lacking shock features. Sparse metal pockets around troilite and metal. Native Cu is rare to 20 microns. Weathering is low and locally present around some kamacite grains. Many of the metal-troilite grains show complex finely intergrown textures of the two.

Geochemistry: (L. Garvie, ASU) Olivine, Fa24.5±0.3, Fe/Mn=48.2±2.0, n=10; low Ca-pyroxene, Fs20.6±0.1Wo1.5±0.2, Fe/Mn=28.2, n=8; high Ca-pyroxene, Fs8.0Wo44.6, Fe/Mn=28.2, n=1; and, feldspar, Or5.9±0.7An10.4±0.2, n=5.

Classification: L6, W1, S3

Specimens: 164 g and one thin section at ASU.

Data from:
  Table 0
  Line 0:
Date:2014 Jan 30
Mass (g):6143
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):24.5±0.3
Ferrosilite (mol%):20.6±0.1
Wollastonite (mol%):1.5±0.2
Classifier:L. Garvie, ASU
Type spec mass (g):164
Type spec location:ASU
Main mass:MFarmer
Finder:Hugo Lino
Comments:Submitted by L. Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     Recommended::   (30° 12' 3"N, 111° 56' 25"W)

     This is 1 of 9 approved meteorites from Sonora, Mexico
     This is 1 of 113 approved meteorites from Mexico (plus 4 unapproved names) (plus 1 impact crater)
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