Why this rock is probably not a meteorite:

1) No fusion crust.  A freshly fallen meteorite will have some fusion crust.

2) The finder described the rock as "very light... with porous texture."  No known type of meteorite is "very light" (low density) and none are porous. 

3) The clasts stand out in positive relief (they "stick out").  In meteorite breccias, the matrix is as hard as the clasts, so on a broken surface the clasts are neither "innies" nor "outies." 

4) The clast at the left appears to be that of an amygdoidal basalt (see nos. 16, 17, 28, & 30) with the amygdules filled with some secondary mineral (calcite?). No known meteorite is an amygdoidal basalt.
What is it?

Some type of terrestrial basalt conglomerate.

The finder heard something hit the house and found this rock in a bush.  No rocks like this occur in the yard.  

We have listened to or read several stories from persons who heard something hit the house, a tree, or the ground. When they searched, they found a strange rock that hadn't been there the day before. None of the offending rocks that we have examined have been meteorites.  

This rock was described as being the size of a grapefruit. We can't help observing that such a rock is a good throwing size. 


Prepared by:

Randy L. Korotev

Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you’ve found until you read this and this.