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| Reckling Peak 17052 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Reckling Peak 17052 This is an OFFICIAL meteorite name. Abbreviation: RKP 17052 Observed fall: No Year found: 2018 Country: Antarctica [Collected by Programma Nazionale di Ricerche in Antartide (PNRA), Italy] Mass:  0.8 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 453 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||||||
| Comments: | Approved 20 Dec 2022 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 111:
Reckling Peak 17052 (RKP 17052) 76°13’09.5"S, 158°22’51.9"E Antarctica, Antarctica Find: 2018 Jan 20 Classification: HED achondrite (Howardite) History: A small (~7 mm across), half fusion-crusted stony fragment was recovered from the Reckling Moraine ice field, Antarctica, during the 2017-2018 Italian Programma Nazionale delle Ricerche in Antartide (PNRA) meteorite search campaign. Physical characteristics: Small (~0.7 mm across), half fusion-crusted stony fragment Petrography: A section across the whole specimen reveals that RKP 17052 is a polymict breccia dominated by lithic clasts and mineral fragments of eucritic and diogenitic compositions (pigeonite, augite, plagioclase; olivine ) typically up several hundreds of µm in size, set in a more fine–grained fragmental matrix. Few anhedral patches of Fe-Ni metal (kamacite with lesser taenite) up to 400 µm in size are scattered within the clastic groundmass. Digital image analyses allows discrimination of silicates, chromite, Fe,Ni metal and sulphides accounting for 96.2, 1.7, 1.3 and 0.80 vol.% respectively. A portion of a large igneous clast >2 mm across is observed on one side of the section. It shows a microporphyritic texture given by subhedral-to-anhedral phenocrysts of enstatite and olivine and up to 300 µm in size set in a more fine-grained matrix composed mainly by xenomorphic intergrowths of enstatite and olivine plus accessory Fe-sulfide and chromite. Enstatite and olivine occur in ol-orthopyroxenite modal proportions, 61 and 39 vol%, respectively. Magnetic susceptibility: 4.25 (log chi) measured by SM30 susceptivimeter. Geochemistry: The mineral chemistry of the host breccia is: pigeonite En63±11Wo3±2; augite, En37±3Wo39 ± 6; plagioclase An89±6 Ab11±5; olivine Fo68±11; kamacite ~4 wt% Ni; taenite ~50 wt% Ni. The mineral chemistry of the ol-orthopyroxenite clast is: enstatite En73±2Wo2±0.3) olivine (Fo64±0.2). Fe/Mn atomic ratios in pyroxene and olivine from the large orthopyroxenite clast and host breccia are indistiguishable and average 38.6±11.6 (namely 33.2±2.3 and 53.4±3.0 in the clast and 31.2±3.7 and 53.4±7.2 in the host breccia, respectively Classification: Howardite (metal-rich) | ||||||||||||||||||||||||||||||
| Data from: MB111 Table 0 Line 0: |
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| Institutions and collections |
DST-PI: Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy (institutional address; updated 17 Oct 2011) MNA-SI: Museo Nazionale dell'Antartide, Università di Siena, Via Laterina 8, I-53100 Siena, Italy; Website (institutional address; updated 13 Dec 2011) |
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| References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:
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Statistics: This is 1 of 8 approved meteorites from Antarctica, Antarctica This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||||||||
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