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Golden Gate Mountain | |||||||||||||||||||||||||||||||||||||
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Basic information | Name: Golden Gate Mountain This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2011 Country: United States Mass: 16.7 g | ||||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 6484 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 18 Jul 2020 | ||||||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Golden Gate Mountain 32°08.999’N, 111°06.817’W Arizona, USA Find: 2011 May 1 Classification: Ordinary chondrite (H4) History: Ingrid "Twink" Monrad found the meteorite on May 1, 2011, while she was meteorite hunting in the area where the Cat Mountain meteorite was found. The stone was found on top of the sand in a little dry streambed and was attracted to a magnet. Physical characteristics: The 16.7 g complete stone is approximately 1.5 × 2.5 × 1.25 cm. It exhibits patchy, remnant fusion crust along with desert varnish in some places. The exposed meteorite displays a caramel color that is in contrast to the black and brown-stained interior cut face. Deep fractures penetrate the entire rock, some containing thin deposits of caliche. Numerous well-delineated chondrules are visible in the hand specimen. Petrography: (K. Domanik and D. Hill, UAz) Microprobe examination of a polished mount shows numerous distinct, round to irregularly shaped chondrules that range from 50 to 1300 μm in size. Most chondrules are less than 100 μm in diameter. POP, PO, and PP chondrules predominate with a few RP and BO also present. 10 to 50 μm plagioclase patches occur almost exclusively within chondrules and typically contain abundant, small, quench crystals of clinopyroxene. The matrix consists of smaller chondrule fragments. Numerous veins and grains of highly oxidized (weathered) metal and troilite form complex networks. Minor amounts of chromite, merrillite, and chlorapatite are also present. Geochemistry: Mineral compositions and geochemistry: (K. Domanik, UAz) EMPA: Olivine Fa18.1±0.2, Fe/Mn=36.1±2.1, (N=57); low-Ca pyroxene Fs16.0±0.2Wo1.1±0.4, Fe/Mn=22.4±3.1, (N=31); plagioclase An10.9±4.7Ab83.8±3.5 Or5.3±1.4, (N=6); kamacite Fe=92.9±0.4, Ni=6.5±0.1, Co=0.66±-0.04 (all in wt%), (N=6). Classification: H4 (severe weathering) Specimens: 13 g main mass, Ingrid "Twink" Monrad; 3.7 g UAz | ||||||||||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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Institutions and collections |
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 179 approved meteorites from Arizona, United States (plus 1 impact crater) This is 1 of 1925 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters) | ||||||||||||||||||||||||||||||||||||
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Revision history: |
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