[longshadow]

But how can something that large (1/10th mm) go through the earth (about 4000 miles of which is molten and solid iron)... and keep going. I would expect more of a crater and explosion.

Think of these things as being incredibly small, sharp needles that are made of "unobtainium," weigh a ton, and are going almost a million miles per hour. They blast their way through almost anything because they are virtually indistructable, have almost no cross-sectional area (and hence don't encounter much matter when they penetrate) and have a kinetic energy that Indy race car drivers can only dream of.

Pretty weird stuff.....

[edwin hubble]

...
Ok, these stranglets are 0.1 mm in diameter and 1000 kg at 400,000 m/s
Thats 40 gigawatts in the 19 seconds it is passing through the Earth. (if all energy were consumed... which it is not)
The energy is about a quarter of the Hiroshima device.

So, what would a meteorite of the same energy look like?
If that had been a typical meteorite (of density=5 g/cm^3) of the same energy it would be 20x20x20 feet and travelling at 25000 mph.

Your reference to unobtainium, and the ease which which strangelets go through the Earth's iron core:
I guess the real-world analogy is the depleted uranium rounds going through tank armor like butter. Well, the density is an instructive analogy, but the speed isn't.

What I find interesting is the seemingly unending succession of surprises we get from nature.