Description
Provenance : Fabien Kuntz > me
Sold with label/certificate.
Northwest Africa 6933 (NWA 6933)
(Northwest Africa)
Purchased: 2010
Classification: HED achondrite (Eucrite)
Petrography: (K. Metzler, IfP) Coarse-grained eucritic clasts with ophitic to subophitic textures and mineral fragments (pyroxene, plagioclase, silica polymorph) set in a dark gray matrix. The matrix represents a crystallized melt with subophitic texture consisting of pyroxene and skeletal plagioclase crystals. Lithic clasts and mineral fragments are strongly recrystallized. Some pyroxene fragments contain Fe-rich olivine veins. Accessories are ilmenite, troilite, and metal (mostly oxidized). Calcite veins occur.
Geochemistry: Plagioclase compositions: An 89.1±2.0 (85-93; n=15). Olivine veins: Fa75.
Classification: Eucritic melt rock
Place of purchase:MoroccoDate:P 2010Mass (g):835Pieces:1Class:EucriteShock stage:moderateWeathering grade:highFayalite (mol%):75 (n=1)Ferrosilite (mol%):45.2±11.8 (28-59; n=15)Wollastonite (mol%):22.2±15.4 (6-43)Classifier:K. Metzler, IfPType spec mass (g):20Type spec location:IfPMain mass:F. Kuntz, FranceComments:Submitted by K. Metzler
