.118 grams NWA 7485 Meteorite Eucrite-mmict - fragment + COA (TKW is 360 grams)

Description

Northwest Africa 7485
Name:
Northwest Africa 7485
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 7485
Observed fall:
No
Year found:
2012
Country:
Morocco
Mass
360 grams
Meteoritical Bulletin:
(2012)
Eucrite-mmict
Recommended:
Eucrite-mmict
This is 1 of 263 approved meteorites classified as Eucrite-mmict.
Approved 8 Nov 2012
Northwest Africa 7485
(NWA 7485)
Morocco
Purchased: May 2012
Classification: HED achondrite (Eucrite, monomict)
History
: Purchased by Sean Tutorow in May 2012 from a Moroccan meteorite dealer.
Physical characteristics
: Single stone, dark brown exterior, some weathered fusion crust, saw cut reveals patches of dark-gray and light-gray, slight oxidation.
Petrography
: (C. Agee,
UNM
) Microprobe examination of a polished mount shows a brecciated texture with approximately 60% pyroxene and 30% plagioclase, many pyroxenes with exsolution lamellae. Numerous shock melt veins up to 500
μm
wide. Accessory silica, ilmenite, chromite, troilite, and low-Ni iron metal.
Geochemistry
: (C. Agee and M. Spilde,
UNM
) Pyroxene Fs
47.5±14.6
Wo
19.1±17.6
, Fe/Mn=31±1, n=36, with equilibrated trend Fs
61.0
Wo
1.8
to Fs
27.0
Wo
43.2
; plagioclase Or
0.5±0.4
Ab
10.3±1.6
An
89.2±2.0
, n=7.
Classification
: Achondrite (eucrite, monomict). Equilibrated main group eucrite.
Specimens
: 20.41 g including a probe mount on deposit at
UNM
, Sean Tutorow holds the main mass.
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