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Sentinel Plain (c)
Basic information Name: Sentinel Plain (c)
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: United States
Mass:help 540 g
Classification
  history:
Recommended:  L6    [explanation]

This is 1 of 11725 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 29 Jun 2021
Writeuphelp
Writeup from MB 110:

Sentinel Plain (c)        32°52’26.28"N, 112°57’36.90"W

Arizona, United States

Find: 12 Nov 2018

Classification: Ordinary chondrite (L6)

History: A 540 g meteorite was found by Mr. Robert Szczuczko on 12 November 2018, while he was searching for meteorites in southwestern Arizona.

Physical characteristics: Single 540 g partly fusion crusted blocky stone with shallow to deep regmaglypts. The exterior displays 3 areas of distinct physical characteristics, a thick smooth black-brown thick fusion crust with regmaglypts, a rough surface with shallow black fusion crust and a relatively fresh broken surface revealing the interior. The interior shows some well-defined chondrules separated by a red-stained matrix and scattered metallic grains and occasional metal filled fractures, though no shock vein were discernible.

Petrography: (L. Garvie, ASU, R. Szczuczko) A thin section shows a largely coarsely crystallized meteorite with a smattering of recognizable chondrules. Metal and troilite typically <1 mm in size, though in a few areas the metal is elongated into thin veins. Feldspar commonly >50 μm across. Under crossed polars, the troilite is single crystal and lacks shock features.

Geochemistry: Fa25.4±0.4, n=24; Fs21.4±0.3Wo1.6±0.3, n=18

Classification: L6, S2, W2

Specimens: 36.7 g at ASU

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Arizona
Date:12 Nov 2018
Latitude:32°52'26.28"N
Longitude:112°57'36.90"W
Mass (g):540
Pieces:1
Class:L6
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):25.4±0.4 (n=24)
Ferrosilite (mol%):21.4±0.3 (n=18)
Wollastonite (mol%):1.6±0.3
Classifier:L. Garvie, ASU, R. Szczuczko
Type spec mass (g):35.7
Type spec location:ASU
Main mass:R. Szczuczko
Finder:R. Szczuczko
Comments:ASU#2108; 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography:

United States
Coordinates:
     Recommended::   (32° 52' 26"N, 112° 57' 37"W)

Statistics:
     This is 1 of 177 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1883 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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