TIL of a meteorite originating from the Mars moon Phobos that fell on the territory of a russian military base in Yemen in 1980. It contains the mineral Florenskiite, not found anywhere else on Earth.

What the other poster means is that the current undestanding of physics basically knows how elements are made. They are like constructor toys made out of parts. There are limited number of ways to construct elements. We have found and studied most of the ways you can put these parts together.

So there are no "hidden" ways to put them together lurking "between" the ones we know. In a periodic table, they are all in sequence. It's either you "put part #4 in the 3rd or 4th slot" and you get a different element. There are exotic ways to construct superheavy elements with lots of parts, but they don't want to hold together and exist for only few moments. At the lowest end, you've got just 2 basic parts (hydrogen).

/r/todayilearned Thread Parent Link - astrobio.net