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Little Harquahala Mountains | |||||||||||||||||||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||||||||||||||||||
Classification history: |
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 | ||||||||||||||||||||||||||||||||||||
Writeup![]() |
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: |
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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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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Geography:![]() |
Statistics: This is 1 of 178 approved meteorites from Arizona, United States (plus 1 impact crater) This is 1 of 1894 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters) | ||||||||||||||||||||||||||||||||||||
Proximity search: |