send me photos of large rocks that they think might be meteorites. If it's
big, it's probably not a meteorite. Here are some statistics.
shows that the most common mass for a stony meteorite is in the range
128-256 grams (4.5-9 oz).
shows that half of stony meteorites are less than 283 g (10 oz.) in mass.
Only 10% are greater than 5400 g (12 lbs.)
Caveat 1: I took
these data from the online
database of the Meteoritical Society in November of 2010. The
"mass" is the total mass of all stones of a meteorite. Large
meteorites fragment as they come through the atmosphere and land, so these
charts exaggerate the size of any
given stone of a meteorite. That is, although 50% of meteorites are
less than 283 grams in total mass, 50% of meteorite fragments are much less than 283 in mass. The
numbers arenít really known. For example, the largest meteorite represented
here is Jilin,
which had an estimated mass of 4,000 kg. The largest surviving fragment was
1170 kg. This is probably the largest know fragment of any stony meteorite.
There were hundreds of smaller fragments.
Caveat 2: A large fraction
of the meteorites represented here are from the Sahara Desert. Sometimes
for Saharan meteorites, different fragments of a single meteorite are given
different names. This "source of error" is probably minor.