On Offer: 15.5 gram CK5 carbonaceous chondrite fragment with fresh fusion crust

Description: Exceptional 15.5 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.

Official Name: NWA 12925

Type: CK5 Carbonaceous Chondrite

What you get: 15.5g CK5 Carbonaceous Chondrite Meteorite Fragment Specimen as shown, Membrane Storage/Display Box, and signed Certificate of Authenticity.

I offer a 100% no questions asked 30 day .

OFFICIAL METEORITICAL SOCIETY ENTRY BELOW

Northwest Africa 12925Basic informationName: Northwest Africa 12925
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12925
Observed fall: No
Year found: 2018
Country: (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 2019Writeup
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 Fa 30 0.8, Fe/Mn=102 8, NiO=0.48 0.05 (wt%), n=20; low-Ca pyroxene Fs 26.8 0.9Wo 1.2 1.3, Fe/Mn=68 7, n=6; clinopyroxene Fs 13.8 4.4Wo 34.9 11.9, Fe/Mn=58 7, n=6. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave 18O= 1.584, 1.005, 1.067; 17O= -3.141,-3.415, -3.581; 17O= 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:MoroccoDate:P 2018Mass (g):3800Pieces:1Class:CK5Shock stage:lowWeathering grade:lowFayalite (mol%):30 0.8Ferrosilite (mol%):26.8 0.9, 13.8 4.4Wollastonite (mol%):1.2 1.3, 34.9 11.9Classifier:C. Agee, UNMType spec mass (g):20.5Type spec location:UNMMain mass:Dustin DickensComments:Field name DD-50; submitted by C. Agee, UNMPlots:O isotopes: Institutions
and collectionsUNM: Institute of Meteoritics MSC03 2050 University of Mexico Albuquerque NM 87131-1126 USA, United States; Website

(institutional address; updated 12 Feb 2015)

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Product Attributes:

Country/Region Of Manufacture: Unknown

New Fall: Fresh crust

Weight (lbs.): 0.50 lb

Length (in.): 12

Width (in.): 10

Height (in.): 3