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Sentinel Plain (a)
Basic information Name: Sentinel Plain (a)
     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 97 g
Recommended:  H5    [explanation]

This is 1 of 10615 approved meteorites (plus 18 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 29 Jun 2021
Writeup from MB 110:

Sentinel Plain (a)        32°52’17.88"N, 113°3’42.12"W

Arizona, United States

Find: 26 Mar 2018

Classification: Ordinary chondrite (H5)

History: A fresh, 97 g fusion-crusted meteorite was found by Mr. Robert Szczuczko on 16 March 2018, while he was searching for meteorites in southwestern Arizona.

Physical characteristics: Single 97 g fusion-crusted blocky stone with shallow regmaglypts. A matte to shiny black fusion crust covers the stone. The interior shows tightly packed well-defined chondrules separated by a light-colored matrix and abundant small metal grains. Interior is light gray and shows little weathering.

Petrography: (L. Garvie, ASU, R. Szczuczko) Polished slice and probe mount show an abundance of well-formed chondrules and chondrule fragments in a recrystallized matrix. Section contains a 3.5 × 2.5 achondritic clast. Chondrules (PO, POP, PP, RP, CC, BO, GO) to 2 mm, though most <0.5 mm. Some chondrules armored by troilite. Interchondrule feldspar typically <15 μm across. Metal grains rarely larger than 0.3 mm and troilite <0.2 mm. Most metal grains exhibit a consertal outline with the surrounding silicates. Under crossed polars, the troilite is single crystal and lacks shock features. Native Cu is rare, with grains to 10 μm. Chromite is uncommon and typically <50 μm across.

Geochemistry: Fa 18.6±0.2 n=9, Fs15.5±2.5Wo0.9±1.1 n=8

Classification: H5, S2, W1

Specimens: 21 g at ASU

Data from:
  Table 0
  Line 0:
Date:26 Mar 2018
Mass (g):97
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):18.6±0.2
Ferrosilite (mol%):15.5±2.5
Wollastonite (mol%):0.9±1.1
Classifier:L. Garvie, ASU, R. Szczuczko
Type spec mass (g):21
Type spec location:ASU
Main mass:R. Szczuczko
Finder:R. Szczuczko
Comments:ASU#2079; 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)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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United States
     Recommended::   (32° 52' 18"N, 113° 3' 42"W)

     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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