Description: NORTHWEST AFRICA 15581 (NWA 15581)CK5 CARBONACEOUS METEORITE FOUND IN APRIL 2022IN MALI 🇲🇱 125 GRAMS GUARANTEED AUTHENTICITY YOU ARE BUYING 100% A GUARANTEED AUTHENTIC METEORITE combined with a signed certificate of authenticityFirst express class delivery and provenance provided. I SHIP WORLDWIDE WITH FEDEX, DHL, UPS OR SIMILAR EXPRESS SERVICE, TRACKED & TRACED OFFICIAL CLASSIFICATION DATA SOURCE: THE METEORITICAL SOCIETY INTERNATIONAL SOCIETY FOR METEORITICS AND PLANETARY SCIENCE LUNAR AND PLANETARY INSTITUTE METEORITICAL BULLETIN DATABASE Northwest Africa 15581Basic informationName: Northwest Africa 15581 This is an OFFICIAL meteorite name. Abbreviation: NWA 15581 Observed fall: No Year found: 2022 Country: (Northwest Africa) Mass: 1577 g Classification history:Recommended: CK5 Comments:Approved 11 Apr 2024WriteupWriteup from MB 113: Northwest Africa 15581 (NWA 15581)(Northwest Africa)Purchased: 2022 AprClassification: Carbonaceous chondrite (CK5)History: Purchased by Mbark Arjdal in April 2022 from a Malian dealer.Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Sparse well-defined, mostly porphyritic chondrules containing Cr-magnetite stained by Fe terrestrial hydroxides are set in a fine grained matrix containing stained Cr-magnetite, subcalcic augite, intermediate plagioclase and composite grains of ilmenite+Cr spinel. Minor secondary calcite, barite and Fe oxide are present.Geochemistry: Olivine (Fa30.5±0.3, range Fa30.0-30.8, N = 5), low-Ca pyroxene (Fs27.6±1.3Wo0.9±0.4, range Fs26.6-29.2Wo0.4-1.3, Al2O3 3.1-5.3 wt.%, N = 4), pigeonite (Fs23.8Wo9.6, Al2O3 3.0 wt.%), subcalcic augite (Fs14.7Wo30.9, Al2O3 2.2 wt.%), plagioclase (An30.3Or2.5; An50.2Or1.0; N = 2), magnetite (Cr2O3 3.7-3.9 wt.%, N = 3).Classification: Carbonaceous chondrite (CK5).Specimens: 22.9 g plus one polished thin section at UWB; remainder with Mr. M. Arjdal.Data from: MB113 Table 0 Line 0:Place of purchase:MaliDate:P 2022 AprMass (g):1577Pieces:15Class:CK5Shock stage:lowWeathering grade:lowFayalite (mol%):30.6±0.3Ferrosilite (mol%):27.6±1.3Wollastonite (mol%):0.9±0.4Classifier:A. Irving, UWS, and P. Carpenter, WUSLType spec mass (g):22.9Type spec location:UWBMain mass:M. ArjdalComments:Work name Arj ZM 805; submitted by A. Irving CK5 means:"A carbonaceous chondrite of the CK group that is anomalous and petrologic type 5."The highlighted words are defined as follows:carbonaceous chondrite: A major class of chondrites that mostly have Mg/Si ratios near the solar value and oxygen isotope compositions that plot below the terrestrial fractionation line.CK group : The Karoonda (CK) chemical group of carbonaceous chondrites, distinguished by abundant fine-grained matrix (~75 vol%), mm-sized chondrules that lack igneous rims, relatively few refractory inclusions, and a high degree of oxidation; most CK chondrites have been metamorphosed to type 4 or higher.anomalous: Designates meteorites that have been determined to be a member of a specific group, but have certain properties that are unusual or distinctive.type 5: Designates chondrites that have been metamorphosed under conditions sufficient to homogenize olivine and pyroxene, convert all low-Ca pyroxene to orthopyroxene, cause the growth of various secondary minerals, and blur chondrule outlines.
Price: 995 USD
Location: Newtownabbey
End Time: 2025-01-12T17:29:07.000Z
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Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Country/Region of Manufacture: Mali