Sample Petrographic Description
Sample Number | ALH 84030 |
Newsletter | 8,2 |
Location | Allan Hills |
Field Number | 1566 |
Dimensions (cm) | 2.0 x 1.8 x 1.5; 1.5 x 1.0 x 1.0 |
Weight (g) | 6.21 |
Original Classification | C2 Chondrite |
Updated Classification | CM1/2 Chondrite |
Pairing | ALH 83100; ALH 83102; ALH 83106; ALH 84029; ALH 84030; ALH 84031; ALH 84032; ALH 84034; ALH 84035; ALH 84040; ALH 84041; ALH 84042; ALH 84043; ALH 84044; ALH 84045; ALH 84047; ALH 84048; ALH 84049; ALH 84051; ALH 85004; ALH 85106; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0-2 | |
Weathering | |
A | |
Fracturing | |
B/C | |
Macroscopic Description - Carol Schwarz | |
This specimen consists of two pieces, one extremely fractured, which are black and fine-grained and similar to ALH83100. One piece was chipped to reveal a black fine-grained interior. | |
Thin Section Description (,4) - Glenn MacPherson | |
This meteorite resembles ALH84030, ALH84031, ALH84032, ALH84034, ALH84042, and ALH84044. All are very similar to one another and all resemble ALH83100, with which they are probably paired. Alteration is extensive and the major component is a brown to black phyllosilicate matrix that encloses green to pale brown phyllosilicate pseudomorphs of chondrules, crystals and inclusions. Calcite is abundant. Sporadic primary olivine crystals are preserved and are mostly Fa0-2, although a few as iron-rich as Fa37 were found. Chromite, pentlandite, and (?) magnetite are accessory. Chondrules and inclusions range up to a little over 1 mm in diameter. Inclusions are completely altered. This is a C2 chondrite. | |
Reclassification Notes (AMN 45,2) | |
ALH 84030 has similar appearance and location to ALH 83100 and ALH 83102 and so they have been paired. |
Antarctic Meteorite Images for Sample ALH 84030 | ||||
Thin Section Photo(s) : | ||||