diatom

In particular the type of diatom that blooms matters.

Great follow up to the diatom bloom analogy.

I guess we can't really exclude the possibility, that this fossilized diatom cam from earth, traveled through space and came back to earth?

There is not reason for a diatom to deliberately settle inside an opaque bone.

"Shards of glass" does bring to mind a broken diatom frustule, which is literally a shard of sharp silica when viewed under a microscope.

There are different grades of quality in diatomaceous earth, some are safer, other not so.

Funnily enough the most prevalent siliceous rock is... diatomite.

300 picometers is roughly the diameter of a helium diatom.

That said, it doesn't exclude the possibility of diatoms having perhaps taken a lengthy space trip at some point in their evolutionary history.

It has components of different hardness, the relevant factor being the crushed frustules of ancient diatoms, or diatomaceous silica.

I see. What about candidates for a high silica rock that might have been metamorphized diatom deposits?If this theory was correct and diatoms were the original life form, it would suggest they might be more primitive, genetically, assuming little subsequent evolution.

Incidentally, I've also worked with phaeodactylum tricornutum, which is an eukaryotic diatom, that has 60% of its ORFs prokaryotic in origin....

Indeed - I'd opine that the meteor in question was probably terrestrial in origin, as diatom genetics demonstrate that evolution is live and kicking in diatom populations.

Neither air nor water work as reference points for driving, as the scale in both those worlds is analogous to the variance in insect size [ant to dragonfly] or water creature [diatom to jelly fish] while the road is much more like the difference in dog breeds.