西北非洲13272号陨石 - 非球粒陨石-未分组 - 高度: 3.5 cm - 宽度: 3 cm - 5.1 g - (1)
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Northwest Africa 13272，一颗未分组的碱性陨石，来自毛里塔尼亚州的祖埃拉特，重量为5.1克，尺寸高3.5厘米，宽3厘米，厚0.2厘米。
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卖家的描述
Slice. Weight 5.1 grams
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Northwest Africa 13272 (NWA 13272)
(Northwest Africa)
Purchased: 2019 Dec
Classification: Ungrouped achondrite
History: Found in Mauritania and purchased by Rachid and Jaouad Chaoui in December 2019 from a dealer in Zouerat, Mauritania.
Physical characteristics: The specimen lacks fusion crust and is coated by a shiny brown desert patina. Polished interior surfaces reveal the presence of rare tiny specks of partially altered metal.
Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen has a fine grained, poikilitic igneous texture. Composed predominantly of polysynthetically-twinned, compositionally-zoned pyroxene oikocrysts (with domains of orthopyroxene, pigeonite and subcalcic augite) enclosing chadacrysts of olivine, together with interstitial devitrified silicic glass (pale pink in thin section) plus accessory troilite (some Cr-bearing), Ti-poor chromite and very rare kamacite (some altered to Fe hydroxides). Olivine is preferentially stained pale orange in thin section, and there are some cross-cutting dilation veins filled with comminuted olivine and orthopyroxene. Minor secondary calcite and anhydrite are present.
Geochemistry: Olivine (Fa24.0-29.5, N = 8), orthopyroxene (Fs17.9-19.0Wo2.0-3.8, N = 5), pigeonite (Fs18.9-19.0Wo7.2-9.0, N = 2), subcalcic augite (Fs12.2-12.6Wo33.7-37.1, N = 4). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed bulk subsamples by laser fluorination gave, respectively, δ17O 4.120, 4.159, 4.045; δ18O 5.908, 6.096, 5.717; Δ17O 1.001, 0.940, 1.026 per mil.
Classification: Achondrite (ungrouped, igneous, with oxygen isotopic affinity to L chondrites).
Slice. Weight 5.1 grams
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Northwest Africa 13272 (NWA 13272)
(Northwest Africa)
Purchased: 2019 Dec
Classification: Ungrouped achondrite
History: Found in Mauritania and purchased by Rachid and Jaouad Chaoui in December 2019 from a dealer in Zouerat, Mauritania.
Physical characteristics: The specimen lacks fusion crust and is coated by a shiny brown desert patina. Polished interior surfaces reveal the presence of rare tiny specks of partially altered metal.
Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen has a fine grained, poikilitic igneous texture. Composed predominantly of polysynthetically-twinned, compositionally-zoned pyroxene oikocrysts (with domains of orthopyroxene, pigeonite and subcalcic augite) enclosing chadacrysts of olivine, together with interstitial devitrified silicic glass (pale pink in thin section) plus accessory troilite (some Cr-bearing), Ti-poor chromite and very rare kamacite (some altered to Fe hydroxides). Olivine is preferentially stained pale orange in thin section, and there are some cross-cutting dilation veins filled with comminuted olivine and orthopyroxene. Minor secondary calcite and anhydrite are present.
Geochemistry: Olivine (Fa24.0-29.5, N = 8), orthopyroxene (Fs17.9-19.0Wo2.0-3.8, N = 5), pigeonite (Fs18.9-19.0Wo7.2-9.0, N = 2), subcalcic augite (Fs12.2-12.6Wo33.7-37.1, N = 4). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed bulk subsamples by laser fluorination gave, respectively, δ17O 4.120, 4.159, 4.045; δ18O 5.908, 6.096, 5.717; Δ17O 1.001, 0.940, 1.026 per mil.
Classification: Achondrite (ungrouped, igneous, with oxygen isotopic affinity to L chondrites).
详细资料
物品件数
1
陨石类型
Northwest Africa 13272 - Meteorite, Achondrite-ung
重量
5,1 g
国家
Zouerat, Mauritania
高度
3,5 cm
宽度
3 cm
深度
0,2 cm
