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North Trigo Peaks
Basic information Name: North Trigo Peaks
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2005
Country: United States
Mass:help 167 g
Meteoritical Bulletin:  MB 108  (2020)  L5
Recommended:  L5    [explanation]

This is 1 of 7172 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 19 May 2019
Writeup from MB 108:

North Trigo Peaks        33°28.13’N, 114°26.070’W

Arizona, United States

Find: 1992

Classification: Ordinary chondrite (L5)

History: Purchased by Norm Lehrman on 28 January 2005 from the finder, Charles Graff of Kemp, Texas, a gold-prospector, who had it in a display case at Quartzsite, Arizona. The finder did not recognize his find as being a meteorite until after meeting Prof. Jim Kriegh several years later. Several reports of other masses having been found from this locality have not been corroborated.

Physical characteristics: A single rusty-brown, moderately-weathered whole stone.

Petrography: (A. Rubin, UCLA) Chondrules are readily delineated. Olivine and low-Ca pyroxene grains exhibit sharp optical extinction. None of the low-Ca pyroxene grains exhibits polysynthetic twinning, indicating that these grains are orthopyroxene.

Geochemistry: olivine Fa20.5±0.4 (n=8); low-Ca pyroxene Fs20.5±0.4 (n=2); Wo1.9±0.4 (n=2)

Classification: Ordinary chondrite (L5). Distinguishable from Gold Basin (L4-L6, S3-S5, W2-W5) due to the lower shock stage.

Specimens: A total of 25.0 grams of material and one polished thin section are on deposit at UCLA. Field ID = NL-AZ-01; UCLA ID = LC1419 The main mass is held by Norm Lehrman of Spokane, Washington.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:pediment
Place of purchase:Quartzsite
Mass (g):167
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):24.4±0.2 (n=4)
Ferrosilite (mol%):20.5±0.4 (n=8)
Wollastonite (mol%):1.5±0.4 (n=8)
Classifier:A. Rubin, UCLA
Type spec mass (g):25.0
Type spec location:UCLA
Main mass:Norm Lehrman
Finder:Charles Graff
Comments:Field ID = NL-AZ-01; submitted by Alan Rubin
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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United States
     Recommended::   (33° 28' 8"N, 114° 26' 4"W)

     This is 1 of 170 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1871 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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