Lunar Meteorite: Calcalong Creek

Western Australia

Slices of Calcalong Creek. Photo credits: Robert Haag (left) and David Kring (right)

Two (?) slices of Calcalong Creek. Note the vesicular fusion crust. Photo credit: Jim Strope

Two sides of a 0.25-g slice of Calcalong Creek. Millimeter ticks. Photo credit: Luc Labenne

Outside and inside of a 0.21-g piece of Calcalong Creek. Note the vesicular fusion crust. Thanks to Dolores Hill for the sample. Image credit: Randy Korotev

Photomicrograph of a thin section (field of view: 1.1 cm across). Most of the clasts are grains of plagioclase and pyroxene. Image credit: Dolores Hill (Figure 1a from Hill & Boynton, 2003). There are no vesicles in the interior of the meteorite.

from The Meteoritical Bulletin, no. 71

Calcalong Creek

Wiluna District, Western Australia, Australia
Found: after 1960
Mass: 19 g (1 piece)

Lunar meteorite

A stone of 19 g was found by an Aborigine meteorite hunter in the Millbillillie strewnfield. It has a complete fusion crust, the interior shows a microbreccia with white angular clasts in a dark matrix (impact melt breccia, calculated from the bulk analysis: 50% anorthosite, 20% KREEP, 15% Luna- 16 type low-Ti mare basalt and 15% Sc-Cr-V components). Information and analysis, Fe/Mn = 73-78, KREEP pattern of REE, Dolores H. Hill, Lunar Planetary Laboratory, University of Arizona, Tucson AZ 85726, USA. See also, D. H. Hill, W. V. Boynton and R. A. Haag, Nature, 1991, in press. The main mass is with Robert Haag, P. O. Box 27527, Tucson, AZ 85726, USA.

Randy Says…

Because Calcalong Creek is a regolith breccia, it has a vesicular fusion crust, as do some lunar meteorites from Antarctica. The vesicles form from release of solar-wind implanted gases during the heating melting of the exterior associated with atmospheric entry.

It’s compositionally distinct from Lynch 002, the only other lunar meteorite from Australia, but similarly rich in incompatible elements like Th.  The two Australian lunar meteorites were found 859 km apart.

More Information

Meteoritical Bulletin Database

Calcalong Creek


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