Sample No.: LEW88516

Location: Lewis Cliff

Field Number: 5348

Dimensions (cm): 2 x 2 x 1.5

Weight (g): 13.2

Meteorite Type: Shergottite

Macroscopic Description: Cecilia Satterwhite

Pitted and mostly shiny fusion crust covers 80% of LEW88516. The sample's interior consists of green/black matrix which appears glassy and has conchoidal fractures. Several dark colored inclusions are present.

Thin Section (,3) Description: Brian Mason

The section shows that this meteorite is an achondrite with the approximate composition (volume percent): olivine 50, pyroxene 35, maskelynite 8, opaques (mostly chromite, with a little troilite) 2, brown glass 5. Olivine is present as rounded anhedral to subhedral grains, up to 1.8 mm long, and weakly pleochroic in pale brown. Pyroxene occurs as colorless subhedral grains up to 3 mm long, showing undulose extinction, and maskelynite is interstitial to the olivine and pyroxene. Dark brown glass containing numerous birefringent needly-like crystals (probably olivine) occurs as veinlets and patches up to 1.5 mm across. A little fusion crust is present on one edge. Microprobe analyses gave the following compositions: olivine, Fa33; pyroxene, Wo5Fs28; maskelynite, An53. The meteorite is a shergottite; it resembles ALHA 77005 in texture and mineral compositions.