I purchased a meteorite fragment from the Sikhote-Alin event that fell in 1947 in southeastern Siberia. I've taken an interest in meteorites.
This one caught my eye due to it's unique shape and also that it was a whole fragment and not a slice.
The Sikohote-Alin was massive (70 metric tonnes that reached the ground). The largest observed to date. (from Wiki) It had a mass of 220,000 pounds before entering the atmosphere.
Composition: 93% iron, 5.9% nickel, 0.42% cobalt, 0.46% phosphorus, and 0.28% sulfur, with trace amounts of germanium and iridium. Minerals present include taenite, plessite, troilite, chromite, kamacite, and schreibersite.
I've been wanting to obtain a meteorite for awhile. I'm eying Martian meteorite fragments but they are pretty expensive for some really small samples. Still, it would be cool to own a piece of Mars.
http://www.imca.cc/mars/martian-meteorites.htm
I'm also thinking about collecting Roman coins. I'd like to get one coin of each of the roman emperors. I think I'll start off with the first five (Augustus, Tiberius, Caligula, Claudius and Nero). I'd like to get a coin with Alexander the Great on it as well from ~330-323 BC.
Does anyone else have meteorites, ancient coins or anything else of interest? I spent a lot of time exploring Roman ruins in Italy. I always wanted a stone from the Appian way (via Appia). "All roads lead to Rome" It ends in the Forum. Kind of hard to verify a stone from there though.