Can someone explain to me how those two are formed naturally?

I know what they are, it's just how they are formed in nature baffles me.

Regular nanotubes or carbon nanotubes?

Carbon nanotubes, sorry for not stating that clearer

definantly not pressure

I think that pressure has something to do with it

take a look at the image, it's so compacted...

I think pressure is a major factor

 

Can someone explain to me how those two are formed naturally?

On earth they are artificial allotropic modifications, but I think scientist managed to find them on some meteors. Care to share a link?

Are you sure it's not made on Earth?

I think they're natural allotropes

http://en.wikipedia.org/wiki/Carbon_nanotube#Natural.2C_incidental.2C_and_controlled_flame_environments

 

One of my friends once explained to me how he makes carbon nanotubes in his lab, but I can't remember much more than it's REALLY annoying to make graphine... (monolayer graphite)

These are all carbon allotropes though, right?

Carbon's natural allotropies are diamond and graphite, and fulleren is artificial. With fulleren we understand molecules which can contain from tens to hundreds of carbon atoms. The most stable is considered Buckminster fulleren, made up of 60 C atoms, forming so pentagons and hexagons. The name buckminster fulleren was given due to the philosopher and architect Buckminster Fuller!

 

There is the amorphous carbon too, but that is not considered as a typical alloptropy due to not being 100% carbon!

Carbon's natural allotropies are diamond and graphite, and fulleren is artificial. With fulleren we understand molecules which can contain from tens to hundreds of carbon atoms. The most stable is considered Buckminster fulleren, made up of 60 C atoms, forming so pentagons and hexagons. The name buckminster fulleren was given due to the philosopher and architect Buckminster Fuller!

 

There is the amorphous carbon too, but that is not considered as a typical alloptropy due to not being 100% carbon!

 

According to the wp page you can get other allotropes from fire...

you can get other allotropes from fire...

 

I heard that somewhere too,

I'm just not entirely sure of the process