H15 - "NWA 12925" Top Rare CK5 Carbonaceous Chondrite Meteorite 2.01g

Description

DESCRIPTION
"NWA 12925" Top Rare CK5 Carbonaceous Chondrite Meteorite
TYPE:
"NWA 12925" Top Rare CK5 Carbonaceous Chondrite
FALL/FIND LOCATION:
North West Africa
WEIGHT:
2.01 g
REF.:
H15
Observations:
The authenticity of this specimen is guaranteed
by the Geologist J.A.Poblador, member of International Meteorite Collectors Association IMCA 5681 and Global Meteorite Association G0043.
Northwest Africa 12925
Basic information
Name:
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:
Meteoritical Bulletin:
Meteorit. Planet. Sci.
55
, 1146-1150">MB 108
(2020)
CK5
Recommended:
CK5
[explanation]
This is 1 of 177 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 Fa
30±0.8
, Fe/Mn=102±8, NiO=0.48±0.05 (wt%), n=20; low-Ca pyroxene Fs
26.8±0.9
Wo
1.2±1.3
, Fe/Mn=68±7, n=6; clinopyroxene Fs
13.8±4.4
Wo
34.9±11.9
, Fe/Mn=58±7, n=6. Oxygen isotopes (K. Ziegler,
UNM
): 3 acid-washed fragments analyzed by laser fluorination gave δ
18
O= 1.584, 1.005, 1.067; δ
17
O= -3.141,-3.415, -3.581; Δ
17
O= 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
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