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Moapa Valley
Basic information Name: Moapa Valley
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2004
Country: United States
Mass:help 699 g
Classification
  history:
Meteoritical Bulletin:  MB 96  (2009)  CM1
Recommended:  CM1    [explanation]

This is 1 of 27 approved meteorites classified as CM1.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 1), CM chondrites, and CM-CO clan chondrites
Comments: Approved 16 Apr 2009
Writeuphelp
Writeup from MB 96:

Moapa Valley                      36°33′26"N, 114°25′37"W

Clark County, Nevada, United States

Find: September 2004

Carbonaceous chondrite (CM1)

History: The specimen was found by Sonny Clary in September, 2004, in the Moapa Valley, southeast of Logandale, Nevada.

Physical characteristics: A single dark gray, flattened stone (698.8 g), exhibiting subparallel contraction cracks and partially coated with black, vesicular fusion crust.

Petrography (A. Irving and S. Kuehner, UWS): Rounded to ellipsoidal objects (0.05 to 0.7 mm across), exhibiting a preferred orientation of their long axes, are set in a fine-grained, dark matrix containing small clusters of sulfide grains. The larger objects are composed mainly of serpentine minerals and S-bearing phase(s) (probably tochinilite), and in thin section range in color from pale yellow-brown to reddish brown to sepia brown; some such objects have serpentine-rich rims and/or larger, subhedral, dark brown grains composed of serpentine/cronstedtite. Sulfides consist of finely intergrown pyrrhotite and pentlandite. Rare magnetite and calcite are present in the matrix, and the specimen is traversed by narrow open fractures and thin veinlets filled with chalcedony.

Geochemistry: Broad-beam EMP analysis of different components gave the following compositions (in wt%): ellipsoidal objects SiO2 31.7–38.4, TiO2 0.07–0.25, Al2O3 1.8–7.2, Cr2O3 0.19–0.73, FeO 15.9–26.3, MnO 0.07–0.18, MgO 22.7–28.8, CaO 0.06–0.25, Na2O 0.04–0.29, SO3 0.03–0.87, sum 85.7–87.4; matrix SiO2 27.1–28.4, TiO2 0.11–0.16, Al2O3 2.7, Cr2O3 0.48–0.57, FeO 34.1–39.7, MnO 0.20–0.25, MgO 14.7–16.5, CaO 0.36–2.9, Na2O 0.21–0.42, SO3 3.9–8.5, sum 89.9–94.1.

Oxygen isotopes (D. Rumble, CIW): analyses of two acid-washed whole rock fragments by laser fluorination gave, respectively, δ18O = 6.29, 6.08‰; δ17O = 0.93, 0.68‰; Δ17O = −2.382, −2.519‰.

Classification: Carbonaceous chondrite (CM1). The degree of terrestrial weathering is low.

Specimens: A total of 21 g, one polished thin section and one polished mount are on deposit at UWS. Mr. S. Clary holds the main mass.

Data from:
  MB96
  Table 3
  Line 3:
State/Prov/County:Nevada
Date:Sept-2004
Latitude:36°33'26"N
Longitude:114°25'37"W
Mass (g):698.8
Pieces:1
Class:CM1
Classifier:A. Irving and S. Kuehner,, UWS
Type spec mass (g):21
Type spec location:UWS
Main mass:S. Clary
Plots: O isotopes:  
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Clary: Ralph "Sonny" Clary, Las Vegas, NV 89131 , United States; Website (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 96, MAPS 44, 1355-1397 (2009)
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Photos:
CreditPhotos
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    (Caution, these are of unknown reliability)
AJS Cosmic Treasures                        
Alan Mazur   
Gerald Armstrong   
John Harrison   
Michael S. Scherman   
Woreczko Jan & Wadi   
Geography:

United States
Coordinates:
     Recommended::   (36° 33' 26"N, 114° 25' 37"W)

Statistics:
     This is 1 of 131 approved meteorites from Nevada, United States (plus 4 unapproved names)
     This is 1 of 1827 approved meteorites from United States (plus 358 unapproved names) (plus 28 impact craters)
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