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Gila Mountains
Basic information Name: Gila Mountains
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2012
Country: United States
Mass:help 3.85 kg
Meteoritical Bulletin:  MB 103  (2014)  H4
Recommended:  H4    [explanation]

This is 1 of 6371 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 30 Apr 2014
Writeup from MB 103:

Gila Mountains        32°41.101’N, 114°24.460’W

Arizona, USA

Found: 20 May 2012

Classification: Ordinary chondrite (H4)

History: One specimen weighing 3.854 kg was recovered by Jason Ira Ryan in May, 2012, from the Arizona desert near the Gila Mountains.

Physical characteristics: One piece, weighing a total of 3.854 kg, was recovered. A dark brown fusion crust, uniformly covering the entire sample, with a total thickness of ~0.5 mm was observed. A thin layer of carbonate material, likely of terrestrial origin, was observed on the surface of the fusion crust. The sample showed no signs of post-fall fractures or damage.

Petrography: (A.J. Lussier, NotreD) Gila Mountains shows a brecciated texture in hand sample, with reddish-brown-to-tan colored, irregularly-shaped clasts (ranging in size from 2-7 mm) set in dark brown/black matrix material; the volume ratio of clasts to matrix is approximately 1:1.5. Chondrules are present in both the clast and matrix material and opaque phases (i.e., oxides and sulfides) are disseminated throughout intra-chondrule areas. Scanning electron microscopy shows that chondrules in the clast material are reasonably well preserved with well-defined edges, whereas chondrules in the matrix are less well preserved, with edges that range from being well- to poorly-defined or ruptured. The cpx:opx ratios of the clast and matrix regions are 3:2 and 2:3, respectively. Throughout the entire sample, pyroxene grain sizes range from 20 to ~150 μm, with the average size being ~70 μm; cpx grains are dominantly equant, whereas opx grains range from equant to elongate. No feldspar grains are visible by petrographic microscope.

Geochemistry: (A. Lussier, NotreD, and I. Steele, UChi) EMPA. Olivine Fa19.0±0.7, Fe/Mn=39±2, n=124; low-Ca pyroxene Fs17±1Wo1, Fe/Mn=23±2, n=110; high-Ca pyroxene Fs9±3Wo40±12, Fe/Mn=21±6, n=31; kamacite, Fe0.92±0.06Ni0.82, n=12; tetrataenite Fe0.50±0.01Ni0.50, n=5; taenite Fe0.74±0.11Ni0.26, n=6.

Classification: Ordinary chondrite (H4). Weathering grade W1. Shock stage S2.

Specimens: Type specimen, 38 g and a thin section, ROM. Main mass, J. Ryan.

Data from:
  Table 0
  Line 0:
Date:20 May 2012
Mass (g):3854
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):19±1
Ferrosilite (mol%):15±3
Wollastonite (mol%):1
Classifier:A.J. Lussier, NotreD
Type spec mass (g):38
Type spec location:ROM
Main mass:Jason Ira Ryan
Finder:Jason Ira Ryan
Comments:Submitted by A. Lussier, ROM
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UChi: University of Chicago, Chicago, IL 60637, United States (institutional address; updated 28 Feb 2011)
NotreD: University of Notre Dame, Notre Dame, Indiana 46556, United States (institutional address; updated 30 Apr 2014)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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United States
     Recommended::   (32° 41' 6"N, 114° 24' 28"W)

     This is 1 of 178 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1886 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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