Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

MIL 090444

Newsletter

34,2

Location

Miller Range

Field Number

20973

Dimensions (cm)

1.25 x 0.75 x 0.75

Weight (g)

1.06

Original Classification

CV3 Chondrite

Pairing

MIL 07590; MIL 07385; MIL 07403; MIL 07597; MIL 07669; MIL 07671; MIL 07678; MIL 07681; MIL 07683; MIL 07684; MIL 07685; MIL 07686; MIL 07690; MIL 07691; MIL 07694; MIL 07696; MIL 07697; MIL 07698; MIL 07699; MIL 090072; MIL 090170; MIL 090171; MIL 090172; MIL 090173; MIL 090174; MIL 090175; MIL 090176; MIL 090177; MIL 090178; MIL 090179; MIL 090184; MIL 090354; MIL 090444; MIL 091010

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 1-35

Weathering

Fracturing

Macroscopic Description - Kathleen McBride

Most of these carbonaceous chondrites have some brown/black fusion crust with polygonal fractures. The interior matrices are black with various colored chondrules and show moderate weathering.

Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach, Nicole Lunning

These meteorites are so similar that a single description suffices. The sections exhibit large chondrules (up to 3 mm) and CAIs in a dark matrix. Olivines range from Fa_0-36 and low-Ca pyroxene is Fs_1-5. The meteorites are unequilibrated carbonaceous chondrites, probably reduced CV3. These are likely paired with the MIL 07590 pairing group previously reported.

Antarctic Meteorite Images for Sample MIL 090444

Field Photo(s) :

ANSMET MIL 090444 - Field Number: 20973, NASA Photo Number: jsc2020e011033

Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah