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NWA 7203 Angrite

NWA 7203 was a single 107 gram fusion crusted stone from Morocco. It was purchased by Luc Labenne in Tucson in 2011.

This meteorite is a quenched angrite from a surface or near surface magma on the angrite parent body. Its texture is dendritic, a result of rapid cooling of the magma. The branches are composed of olivines and feldspar. The space between the branches is filled with pyroxene.

The centers of the branches are composed of intergrown Kirschsteinite olivine (elevated calcium) and faylitic (high iron) olivine. They are brightly colored in thin section in cross-polarized light, XPL. The feldspar is a plagioclase and is the calcium end member, anorthite. In XPL it appears white through shades of gray.

The interstitial pyroxene is an aluminum-titanium-rich clinopyroxene. In plane polarized light, PPL, it is a light rust color.

Thin shock melt veins suggest moderate shock unlike most other angrites.

Fusion crusted slice of NWA 7203 angrite about 3cm by 3cm.

 

 

Thin section sample from 1/4 of the above slice.

 

 

NWA 7203 angrite thin section PPL. Field of view, FOV, is 5.5mm wide.

 

 

NWA 7203 angrite thin section XPL. FOV = 5.5mm.

 

 

NWA 7203 angrite thin section XPL. FOV = 4.6mm.

 

 

NWA 7203 angrite thin section XPL. FOV = 2.9mm.

 

 

NWA 7203 angrite thin section XPL. FOV = 0.5mm.

 

 

NWA 7203 angrite thin section XPL. FOV = 0.5mm.

 

 

NWA 7203 angrite thin section XPL. FOV = 0.4mm.

 

 

NWA 7203 angrite thin section XPL. FOV = 0.3mm.

 

 

NWA 7203 angrite thin section PPL. FOV = 0.4mm.

 

 

NWA 7203 angrite thin section XPL. FOV = 0.4mm.
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