Northwest Africa 7135 (NWA 7135)<\/p>\n
Northwest Africa<\/p>\n
Purchased: 2010 Oct<\/p>\n
Classification: Ungrouped chondrite<\/p>\n
History: Purchased by Fabien Kuntz in October 2010 from a Moroccan dealer at the Munich Show.<\/p>\n
Physical characteristics: Brown stone (51.3 g) lacking fusion crust and with evident light-colored, round chondrules.<\/p>\n
Petrography: (A. Irving and S. Kuehner, UWS) Composed of separated, mostly spherical, relatively small chondrules (mean 0.69\u00b10.53 mm, n=40) in a matrix (~30 vol.%) rich in altered kamacite. Some chondrules contain interstitial feldspathic glass. Minerals are olivine, zoned orthopyroxene, pigeonite, diopside, subcalcic augite, Cr-rich chromite, pyrrhotite, pentlandite, daubreelite, oldhamite, schreibersite and rare barite. The presence of highly reduced sulfides and phosphides suggest an atypical ordinary chondrite.<\/p>\n
Geochemistry: Olivine, predominantly Fa4.8-6.3 (N = 15), with some more ferroan grains Fa19.8-19.9 (N = 2); orthopyroxene, Fs7.0-21.8Wo0.4-1.5 (N = 3); pigeonite, Fs17.3Wo6.9; subcalcic augite, Fs13.3-22.2Wo25.4-29.9 (N = 2). The mean olivine composition (Fa6) is much more magnesian than for H chondrites of similar subtype. Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, \u03b417O = 3.207, 3.649, 3.262, 3.379, 3.859; \u03b418O = 5.175, 6.072, 5.326, 5.333, 6.450; \u039417O = 0.475, 0.443, 0.450, 0.563, 0.453 (all per mil). Oxygen isotopes plot in a region above the TFL and at relatively high \u03b418O values.<\/p>\n
Classification: Ungrouped chondrite, high metamorphic type 3 or type 4.<\/p>\n
Specimens: 10.44 g including one polished thin section at PSF; main mass with Kuntz.
\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"
A. J. Irving, S. M. Kuehner, K. Ziegler, F. Kuntz, P. P. Sipiera 46th Lunar and Planetary Science Conference (2015), Abstract #2437 PDF LINK<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59,1557,7],"tags":[1560,962],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/3469"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3469"}],"version-history":[{"count":5,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/3469\/revisions"}],"predecessor-version":[{"id":3778,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/3469\/revisions\/3778"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3469"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3469"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3469"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}