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Little Harquahala Mountains
Basic information Name: Little Harquahala Mountains
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2006
Country: United States
Mass:help 262 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  H-melt rock
Recommended:  H-melt rock    [explanation]

This is 1 of 13 approved meteorites classified as H-melt rock.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Feb 2011
Writeuphelp
Writeup from MB 99:

Little Harquahala Mountains        33°41.506’N, 113°38.167’W

Arizona, La Paz County, USA

Found: Jan 2006

Classification: Ordinary chondrite (H, melt rock)

History: Russell Williams found a single stone in 14 pieces while prospecting for gold in the Little Harquahala Mountains of Arizona, La Paz County, on January 2006.

Petrography: (Laurence Garvie, ASU) Low-Ca pyroxene and olivine with lesser albitic plagioclase, Fe-Ni, troilite and minor Ca-phosphate, Cr-rich diopside, and Al-rich glass. Much of the metal has been oxidized. The rock is mostly recrystallized and fine-grained, without recognizable chondrules. The grains display a hypidiomorphic texture. The section is dominated by subhedral and polygonal low-Ca pyroxene (typically 0.1 to 0.3 mm, some to 0.7 mm) and euhedral to anhedral olivine (typically <50 μm, with sparse grains to 0.2 mm). The pyroxene occurs as clusters showing a granoblastic texture, with intervening finer-grained pyroxene, olivine, and intersertal plagioclase. The low-Ca pyroxene grains contain an abundance of chadacrysts and inclusions, primarily olivine, but also Cr-rich diopside, Al-rich glass, and troilite.

Geochemistry: (Laurence Garvie, ASU) Olivine Fa19.25 (range 18.43 to 19.68), with FeO/MnO = 38.49; low-Ca pyroxene Fs16.92Wo4.38 (Fs ranges from 16.10 to 18.66 and Wo from 3.19 to 7.12); and plagioclase An16.43Or2.36. One 50-μm diopside grain was found Fs9.28Wo39.22 with 1.2 wt% Cr2O3. Oxygen isotopes replicate analyses (R. Tanaka, OkaU) of acid washed, bulk sample by laser fluorination gave δ17O = 3.147 and 3.158‰; δ18O = 4.571 and 4.750‰; Δ17O = 0.739 and 0.656‰.

Classification: H chondrite melt rock, degree of weathering is moderate and shock is low. The meteorite lacks a chondritic texture but has mineral and oxygen isotope compositions with H-chondrite affinities. This stone shows similarities with NWA 2353, 2635, and 3145.

Specimens: ASU holds 25.98 g and three thin sections. Main mass R. Williams and J. Blennert.

Data from:
  MB99
  Table 0
  Line 0:
State/Prov/County:Arizona, La Paz County
Date:Jan 2006
Latitude:33°41.506'N
Longitude:113°38.167'W
Mass (g):262.2
Pieces:14
Class:H-melt rock
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):19.2 (18.4 to 19.7)
Ferrosilite (mol%):16.9
Wollastonite (mol%):4.38
Classifier:Laurence Garvie
Type spec mass (g):25.98
Type spec location:ASU
Main mass:finder
Finder:Russell Williams
Comments:Submitted by Laurence Garvie
Plots: O isotopes:  
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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Geography:

United States
Coordinates:
     Recommended::   (33° 41' 30"N, 113° 38' 10"W)

Statistics:
     This is 1 of 167 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1835 approved meteorites from United States (plus 358 unapproved names) (plus 28 impact craters)
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