CK Carbonaceous Chondrite with Very Fresh Fusion Crust - 61.2g

  On Offer:  61.2 gram CK5 carbonaceous chondrite fragment with fresh fusion crust Description: Exceptional 61.2 gram CK carbonaceous chondrite fragment with fresh fusion crust on one side, and an interior exposing wellformed black chondrules in a dark grey matrix on the other. The texture of this CK highly resembles the type material of Karoonda, being very loosely compressed and much less dense than most other CK meteorites. This particular specimen appears to have an extraordinary amount of pre-solar refractory material or CAIs, unlike most of the others we have which do have some of this refractory material but not nearly to the extent this specimens displays.    Official Name: NWA 12925 Type: CK5 Carbonaceous Chondrite What you get: 61.2g CK5 Carbonaceous Chondrite Meteorite Fragment Specimen as shown, Membrane Storage/Display Box, & signed Certificate of Authenticity. I offer a 100% no questions asked 30 day return policy.    OFFICIAL METEORITICAL SOCIETY ENTRY BELOW Northwest Africa 12925 Basic information Name: Northwest Africa 12925     This is an OFFICIAL meteorite name.Abbreviation: NWA 12925Observed fall: NoYear found: 2018Country: (Northwest Africa)Mass: 3.8 kg Classification  history: Recommended:   CK5    [explanation] This is 1 of 162 approved meteorites classified as CK5.   [show all]Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites Comments: Approved 21 Nov 2019 Writeup Writeup from MB 108: Northwest Africa 12925 (NWA 12925) (Northwest Africa) Purchased: 2018 Classification: Carbonaceous chondrite (CK5) History: Purchased Dec. 2018 by Dustin Dickens in Morocco from anonymous dealer. Physical characteristics: Dark, fusion crusted exterior, saw cut and broken surfaces reveal a very dark gray interior, some scattered CAIs visible, a few large (>1mm) chondrules are present. Friable. Petrography: (C. Agee, UNM) This meteorite consists numerous texturally equilibrated chondrules, ubiquitous Cr-bearing magnetite and pentlandite. Olivine is nickel-bearing. Matrix appears to be recrystallized with some fine-grained plagioclase. Geochemistry: (C. Agee, UNM) Olivine Fa30±0.8, Fe/Mn=102±8, NiO=0.48±0.05 (wt%), n=20; low-Ca pyroxene Fs26.8±0.9Wo1.2±1.3, Fe/Mn=68±7, n=6; clinopyroxene Fs13.8±4.4Wo34.9±11.9, Fe/Mn=58±7, n=6. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O= 1.584, 1.005, 1.067; δ17O= -3.141,-3.415, -3.581; Δ17O= 3.242, 2.808, 2.958 (linearized, all per mil, TFL slope=0.528). Classification: Carbonaceous chondrite CK5. Specimens: 20.5 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass. Data from:  MB108  Table 0  Line 0: Place of purchase: Morocco Date: P 2018 Mass (g): 3800 Pieces: 1 Class: CK5 Shock stage: low Weathering grade: low Fayalite (mol%): 30±0.8 Ferrosilite (mol%): 26.8±0.9, 13.8±4.4 Wollastonite (mol%): 1.2±1.3, 34.9±11.9 Classifier: C. Agee, UNM Type spec mass (g): 20.5 Type spec location: UNM Main mass: Dustin Dickens Comments: Field name DD-50; submitted by C. Agee, UNM Plots: O isotopes:   Institutions   and collections UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website  (institutional address; updated 12 Feb 2015)