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Keysville
Basic information Name: Keysville
     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 2.65 kg
Classification
  history:
Recommended:  L6    [explanation]

This is 1 of 10992 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 3 May 2019
Writeuphelp
Writeup from MB 108:

Keysville        33°11.317’N, 82°14.367’W

Georgia, United States

Find: 2018 May 21

Classification: Ordinary chondrite (L6)

HistoryA single stone was found by Mr. Greg Ivey and his granddaughter Karmon West and grandson Landon West about 3 miles west of Keysville, Georgia, off Highway 305, by the side of a  dirt road, near a creek, while they were hunting for arrowheads.

Physical characteristics: Physical characteristics: Meteorite appears to be oriented. Surface is covered with an orange-brown weathering rind that varies from 0 to approximately 2 mm in thickness.  Remnant patches of brown-black fusion crust showing polygonal shrinkage cracks are present.

Petrography: (M. Hutson, Cascadia) In thin section, many indistinct chondrules are visible. Phases observed include olivine, low-Ca orthopyroxene, plagioclase feldspar, high-Ca clinopyroxene, maskelynite, Fe-Ni metal, troilite, chromite, copper, merrillite, chlor-apatatite. While the majority of feldspathic material is crystalline feldspar, areas of chromite-plagioclase/glass intergrowths, and maskelynite were observed. Silicates display bimodal coloring: areas containing coarser silicates have a slight yellow staining; fine-grained silicates appear gray. Three irregularly shaped areas stand out in appearance from the rest of the section, and contain coarse (>=100 microns) yellow-stained silicates, including twinned plagioclase feldspar intimately mixed with approximately equal amounts of similarly-sized opaque minerals. Troilite is noticeably more abundant than Fe-Ni metal, and shows a slight change in color along fractures. Approximately 50% of the metal has been replaced by iron hydroxides.

Geochemistry: Mineral compositions and geochemistry: Olivine (Fa25.7±0.6, N=31), low-Ca orthopyroxene (Fs22.0±0.6Wo1.4±0.2, N=21), high-Ca clinopyroxene (Fs8.5±0.5Wo45.2±0.3, N=7), plagioclase feldspar (Ab82.9±1.9Or4.6±1.4, N=14), maskelynite (Ab71.6±1.2Or10.5±0.9, N=12).

Classification: Ordinary chondrite (L6) based on olivine and low-Ca orthopyroxene contents and texture. May be paired with Thomson (L6), which was observed to fall in 1888 roughly 39 km to the northwest, or more unlikely to Claxton (L6), which was observed to fall in 1984 roughly 127 km to the southeast.

Specimens: Cascadia holds 80.3 g in 4 pieces, two polished thin sections, and two mounted butts. Dave Gheesling holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Georgia
Origin or pseudonym:dirt road
Date:2018 May 21
Latitude:33°11.317'N
Longitude:82°14.367'W
Mass (g):2647.7
Pieces:1
Class:L6
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):25.7±0.6
Ferrosilite (mol%):22.0±0.6
Wollastonite (mol%):1.4±0.2
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):80.3
Type spec location:Cascadia
Main mass:Dave Gheesling
Finder:Greg Ivey
Comments:Lab number CML 1167
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Geography:

United States
Coordinates:
     Recommended::   (33° 11' 19"N, 82° 14' 22"W)

Statistics:
     This is 1 of 26 approved meteorites from Georgia, United States
     This is 1 of 1834 approved meteorites from United States (plus 358 unapproved names) (plus 28 impact craters)
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