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San Juan de Ocotán
Basic information Name: San Juan de Ocotán
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2007
Country: Mexico
Mass:help 1365 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  L5
Recommended:  L5    [explanation]

This is 1 of 6712 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 14 Dec 2015
Writeuphelp
Writeup from MB 104:

San Juan de Ocotán        20°42’42.1"N, 103°27’22.3"W

Jalisco, Mexico

Confirmed fall: 2007 Sept 22

Classification: Ordinary chondrite (L5)

History: On the night of 22 September 2007, Mr. Saldaña was woken around 3 am by a crashing sound at the side of his house. He went out to investigate and found a black rock at the foot of a brick wall in the courtyard of his house: the stone was reportedly warm to the touch. The rock had passed through a blue tarpaulin and thick plastic sheeting. For four years, Mr. Saldaña used the stone to prop open a door. However, after watching a television show on meteorites in early 2011, he realized the stone might be a meteorite and contacted Michael Farmer, who traveled to Guadalajara to purchase the stone and visit the fall site.

Physical characteristics: Complete 1365 g fusion-crusted stone, smooth, with a few scattered regmaglypts. Slightly flattened stone, with the largest face of 12 × 10 cm. Exterior shows a few minor rust spots and one corner is chipped and shows adhering blue material, presumably from the blue tarpaulin. Sawn surface dominantly mottled white and light grey exhibiting distinct chondrules separated by thin dark matrix. Chondrules up to 3 mm. Metal and troilite typically <1 mm, though one slice has a troilite/metal vein 3 cm long and up to 3 mm wide.

Petrography: (L. Garvie, ASU) Thin section dominated by sharply defined chondrules and chondrules fragments. Chondrule types include BO, RP, PO, and POP. Also a large compound PP chondrule containing two BO chondrules. Many of the chondrules have troilite/metal rims. Chromite grains scattered and <100 μm. Most metal has a holly-leaf-shaped outline. Metal is typically polycrystalline with a few grains showing dark plessitic etch, or tetrataenite rims with cores of vermiform plessite. Troilite polycrystalline and lacking shock lamellae. The troilite/metal vein consists of polycrystalline troilite (grain size 20 to 200 μm) surround by polycrystalline kamacite. Copper rare, occurring as <50 μm grains in troilite and at the troilite/metal boundaries. A few scattered Ca-Cl-rich and Na-Mg-Ca-rich phosphates to 200 μm found. Feldspar fine grained and difficult to recognize in the thin section. Olivine shows mosaicism and PDFs. Rare melt pockets found associated with the large troilite/metal vein.

Geochemistry: (L. Garvie, ASU) Olivine, Fa24.2±0.5, Fe/Mn=46.4±3.3, n=18; low Ca pyroxene, Fs20.7±0.9Wo1.2±0.5, n=12. Only one high Ca pyroxene grain found, Fs13.0Wo30.4, Fe/Mn18.7.

Classification: L5, S4, W0

Specimens: 51.2 g and two thin sections at ASU.

Data from:
  MB104
  Table 0
  Line 0:
State/Prov/County:Jalisco
Origin or pseudonym:courtyard of house
Date:2007 Sept 22
Latitude:20°42'42.1"N
Longitude:103°27'22.3"W
Mass (g):1365
Pieces:1
Class:L5
Shock stage:S4
Weathering grade:W0
Fayalite (mol%):24.2±0.5
Ferrosilite (mol%):20.7±0.9
Wollastonite (mol%):1.2±0.5
Classifier:L. Garvie, ASU
Type spec mass (g):51.2
Type spec location:ASU
Main mass:MFarmer
Finder:Mr. David Soldaña
Comments:Submitted by L. Garvie
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography:

Mexico
Coordinates:
     Recommended::   (20° 42' 42"N, 103° 27' 22"W)

Statistics:
     This is 1 of 5 approved meteorites from Jalisco, Mexico
     This is 1 of 112 approved meteorites from Mexico (plus 4 unapproved names) (plus 1 impact crater)
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