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Sentinel Plain (b)
Basic information Name: Sentinel Plain (b)
     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 300 g
Recommended:  H4    [explanation]

This is 1 of 6186 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 29 Jun 2021
Writeup from MB 110:

Sentinel Plain (b)        32°50’5.94"N, 113°0’54.84"W

Arizona, United States

Find: 25 Nov 2018

Classification: Ordinary chondrite (H4)

History: A 300 g meteorite was found by Mr. Robert Szczuczko on 25 November 2018, while he was searching for meteorites in southwestern Arizona

Physical characteristics: Single 300 g blocky stone with shallow regmaglypts completely covered in a matte black/brown fusion crust. The interior displays numerous light-brown chondrules separated by a dark-brown colored matrix and scattered metal grains.

Petrography: (L. Garvie, ASU, R. Szczuczko) A 5 × 4 cm polished slab shows well-defined chondrules and small dispersed metal grains in a recrystallized matrix. Thin section shows an abundance of chondrules (PO, PP, BO, RP, CC) to 2.2 mm (POP), though most with a mean near 0.5 mm. Interchondrule feldspar typically to 10 µm, though rarely to 50 µm. Metal and troilite typically <700 µm across, though a few grains to 3 mm. Under crossed polars, the troilite is single crystal and lacks shock features.

Geochemistry: Fa20.2±2.7, n=13; Fs17.2±1.0Wo1.4±1.0, n=10

Classification: H4, S2, W2

Specimens: 40.2 g at ASU

Data from:
  Table 0
  Line 0:
Date:25 Nov 2018
Mass (g):300
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):20.2±2.7
Ferrosilite (mol%):17.2±1.0
Wollastonite (mol%):1.4±1.0
Classifier:L. Garvie, ASU, R. Szczuczko
Type spec mass (g):40.2
Type spec location:ASU
Main mass:R. Szczuczko
Finder:R. Szczuczko
Comments:ASU#2107; 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° 50' 6"N, 113° 0' 55"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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