Sample No.:	LAP 02272
Location:	LaPaz Ice Field
Field No.:	15449
Dimensions (cm):	3.5x3.25x2.25
Weight (g):	39.59
Meteorite Type:	LL6 Chondrite

   

Macroscopic Description: Kathleen McBride
90% of the exterior has thick, fractured black fusion crust. The interior is fine-grained crystalline, gray in color with a lot of rust.

Thin Section (,2) Description: Cari Corrigan, Tim McCoy
The meteorite is an equilibrated LL chondrite (Fa₃₀, Fs₂₅) of petrologic type 6. The section is cross cut by a network of shock melt veins that reach 0.5 mm in diameter. No high pressure silicate polymorphs were noted.

Macroscopic Description: Cecilia Satterwhite
Brown/black frothy fusion crust covers 80% of this ordinary chondrite's exterior surface. Flow lines are visible on the surface. The interior is dark gray with high oxidation. Within the matrix are numerous light gray, white and cream colored inclusions. Size ranges from 1-5 mm.

Thin Section (,2) Description: Cari Corrigan, Tim McCoy

Cross-Polarized Light	Plane-Polarized Light

The section exhibits numerous large (up to 2 mm), well-defined chondrules in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is abundant. The meteorite is moderately weathered. Silicates are unequilibrated; olivines range from Fa_9-31 and pyroxenes from Fs_1-18. The meteorite is an L3 chondrite (estimated subtype 3.8).

Sample No.: MAC 02453 Location: MacAlpine Hills Field No.: 14227 Dimensions (cm):   8.0x6.0x3.5 Weight (g): 410.40 Meteorite Type: CK5 Chondrite

Macroscopic Description: Kathleen McBride
The exterior has a no fusion crust and has a greenish tint. The gray crystalline interior has large gray crystals and small black and white inclusions. This carbonaceous chondrite was very hard.

Thin Section (,2) Description: Cari Corrigan, Tim McCoy

Cross-Polarized Light	Plane-Polarized Light

The section consists of large (up to 2 mm) chondrules in a matrix of granoblastic silicates, sulfides and magnetite. Weathering is minor. Silicates are homogeneous. Olivine is Fa₃₂ and orthopyroxene is Fs₂₆. The meteorite is a CK5 chondrite.

Macroscopic Description: Kathleen McBride, Cecilia Satterwhite
The exterior has brown/black fusion crust with oxidation haloes visible. The interior is dark gray to black with some rusty areas. Gray, white, and rusty millimeter sized inclusions are visible.

Thin Section (,2) Description: Cari Corrigan, Tim McCoy
These meteorites are so similar that a single description suffices. The sections exhibit numerous large (up to 4 mm), well-defined chondrules in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is present. Weathering ranges from minor to moderate. Silicates are unequilibrated; olivines range from Fa_0-25 and pyroxenes from Fs_1-20. The meteorites are L3 chondrites (estimated subtype 3.4).

MAC 02467 Cross-Polarized Light	MAC 02501 Cross-Polarized Light	MAC 02509 Cross-Polarized Light

MAC 02467 Plane-Polarized Light	MAC 02501 Plane-Polarized Light	MAC 02509 Plane-Polarized Light

Macroscopic Description: Cecilia Satterwhite
The brown exterior of this meteorite has some patches of black fusion crust. The interior consists of weathered black matrix with abundant mm sized light inclusions.

Thin Section (,2) Description: Cari Corrigan, Tim McCoy

Reflected Light

The section consists of 70-80% round, elongate and irregular metal particles typically 100-200 microns in diameter but reaching 1 mm. These particles are separated by terrestrial hydrated iron oxides. Chondrules occupy 20-30% of the rock and occur in similar shapes and sizes as metal. They are fine-grained and dominated by barred, microporphyritic and cryptocrystalline texture. Silicates are iron-poor (Fs_1-4). The meteorite is a metal rich chondrite and is similar to QUE 94411.

Macroscopic Description: Cecilia Satterwhite
The exterior is covered with black/brown fusion crust over 60% of its surface. It is heavily oxidized and fractures are visible. The interior is black with rusty brown areas and minor metal is visible. Inclusions are mm sized and range in color from white to gray.

Thin Section (,2) Description: Linda Welzenbach, Tim McCoy

Cross-Polarized Light	Plane-Polarized Light

The section shows an aggregate of distinct chondrules (up to 1 mm), chondrule fragments, and pyroxene grains in a matrix of metal, schreibersite, troilite, daubreelite and alabandite. Metal grains often contain euhedral pyroxene laths. Weathering is modest, with staining of some enstatite grains and minor alteration of metal and sulfides. Microprobe analyses show the pyroxene is Fs_1-4 and metal contains very low concentrations of Si (~0.3 wt.%). The meteorite is an enstatite chondrite, probably an EL4.

Macroscopic Description: Kathleen McBride
The exterior has smooth brown/black fusion crust on 75% of its surface. The interior has a black matrix with light colored chondrules.

Thin Section (,3) Description: Cari Corrigan, Tim McCoy

Cross-Polarized Light	Plane-Polarized Light

The section consists of numerous small chondrules (up to 1 mm), mineral grains and CAIs set in a black matrix; rare metal and sulfide grains are present. Chondrules exhibit significant alteration and shock flattening. Olivine compositions are Fa_1-40, with a peak at Fa_0-2. The matrix consists dominantly of an Fe-rich serpentine. The meteorite is a CM2 chondrite.

Macroscopic Description: Kathleen McBride
The exterior of these carbonaceous chondrites ranges from black to brown with rusty areas. Some metal is visible.

Thin Section (,2) Description: Cari Corrigan, Tim McCoy
The sections of these very small meteorites consist of a few small chondrules (up to 1 mm), mineral grains and CAIs set in a black matrix; rare metal and sulfide grains are present. Olivine compositions are Fa_1-39, with a peak at Fa_1-3. The matrix consists dominantly of an Fe-rich serpentine. The meteorites are CM2 chondrites.

MAC 02779 Cross-Polarized Light	MAC 02779 Plane-Polarized Light	MAC 02854 Plane-Polarized Light

Macroscopic Description: Kathleen McBride
25% of the exterior is covered with thick brown/black fusion crust. The interior is a gray matrix with rusty areas and gray chondrules.

Thin Section (,2) Description: Cari Corrigan, Tim McCoy

Plane-Polarized Light

The section consists of a single unaltered olivine in a groundmass of hydrated phyllosilicates, including those that replace chondrules. Olivine is Fa₂. The matrix consists dominantly of an Fe-rich serpentine. The meteorite is a CM chondrite intermediate between petrologic types 1 and 2.

Macroscopic Description: Cecilia Satterwhite
The exterior has frothy, black patches over 50% of its surface.

Thin Section (,2) Description: Cari Corrigan, Tim McCoy

Cross-Polarized Light	Plane-Polarized Light

This tiny section consists of a few small chondrules that have been completely replaced by phyllosilicate, set in an Fe-rich serpentine matrix. Unaltered olivine or pyroxene grains of sufficient size for microprobe analyses were not found. The meteorite is a highly altered CM chondrite probably of petrologic type 1.

Macroscopic Description: Cecilia Satterwhite
Black fusion crust covers 90% of the exterior. The surface is pitted and has oxidation haloes. The interior is dark gray to black with areas of heavy oxidation. Some metal is visible and inclusions are abundant. Inclusions range in size from 1-5 mm and are white and cream in color.

Thin Section (,2) Description: Linda Welzenbach, Tim McCoy

Cross-Polarized Light	Plane-Polarized Light

The section exhibits numerous small, well-defined chondrules (up to 2 mm) in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is extremely abundant. The meteorite is moderately weathered. Silicates are unequilibrated; olivines range from Fa_9-27 and pyroxenes from Fs_2-24. The meteorites are L3 chondrites (estimated subtype 3.7).

Sample No.: PCA 02065; PCA 02066 Location: Pecora Escarpment Field No.: 13676; 13634 Dimensions (cm):   1.5x1.5x1.0 5.5x3.5x2.0 Weight (g): 3.625; 57.065 Meteorite Type: Howardite

Macroscopic Description: Kathleen McBride
The fusion crust on these howardites range in color from brown to black and varies in thickness with some glassy spots. The interior matrix is light to medium gray in color with some rusty areas. The inclusions range from white to dark gray in color.

Thin Section (,3; ,4) Description: Cari Corrigan, Tim McCoy
These meteorites are almost certainly paired with each other and with the PCA 02009 howardite group, the original description for which is reprinted below:
These sections are similar enough that a single description will suffice. Each show a groundmass of comminuted pyroxene (up to 2 mm) and plagioclase with fine- to coarse-grained basaltic, impact-melt and diogentitic clasts ranging up to 3 mm. Minerals include abundant orthopyroxene with compositions ranging from Fs_17-60Wo_2-8 (Fe/Mn ~29), augite of Fs_~40, plagioclase (An_90-95) and SiO₂. These meteorites are howardites. They are almost certainly paired with each other and with PCA 02009.

PCA 02065 Cross-Polarized Light	PCA 02065 Plane-Polarized Light	PCA 02066 Cross-Polarized Light	PCA 02066 Plane-Polarized Light