NWA 16054 ( 34,460 g )

Endstück, Hochglanz poliert, Matrix hat viele kleine Gasbläschen.
Endcut, highly polished, matrix has abundant pores.
 
Northwest Africa 16054 (NWA 16054)
(Northwest Africa)
Purchased: 2023 Jun
Classification: HED achondrite (Eucrite, melt breccia)
History: The meteorite was purchased from a meteorite dealer on the mineral fair in Sainte-Marie-aux-Mines, France.
Physical characteristics: Five grayish fragments with some fusion crust.
Petrography: Eucrite-melt breccia composed of up to 1 cm basaltic and bulk rock clast plus up to 1.5 mm sized mineral fragments in abundant finely recrystallized shock melted matrix. Matrix has abundant pores and mineral grains entrained in the melt matrix often show resorption textures. Main minerals are exsolved pyroxenes and calcic plagioclase. Minor phases include silica, chromite, ilmenite, and FeS; no metal detected.
Geochemistry: low-Ca pyroxene: Fs58.6±0.5Wo3.8±0.6 (Fs57.9-59.2Wo3.0-4.6, FeO/MnO=28-30, n=7); augite exsolutions: Fs26.2±0.5Wo43.2±0.7 (Fs25.6-27.0Wo42.1-43.8, FeO/MnO=28-33, n=7); calcic plagioclase: An89.3±0.4 (An88.5-89.9, n=7)
 
Place of purchase:
Sainte-Marie-aux-Mines, France
Date:
P 2023 Jun
Mass (g):
1963
Pieces:
5
Class:
Eucrite-melt breccia
Shock stage:
high
Weathering grade:
low
Ferrosilite (mol%):
58.6; 26.2
Wollastonite (mol%):
3.8; 43.2
Classifier:
A. Greshake, MNB
Type spec mass (g):
28
Type spec location:
MNB
Main mass:
Hanno Strufe and Andreas Gruenemeyer
Comments:
Submitted by Ansgar Greshake