Apparently there are 3 solid states of carbon.  This is explained a bit further here:

Phases are distinct forms of the same material. Graphite is one of the solid phases of carbon; diamond is another.

“We’ve now created a third solid phase of carbon,” says Jay Narayan, the John C. Fan Distinguished Chair Professor of Materials Science and Engineering at NC State and lead author of three papers describing the work. “The only place it may be found in the natural world would be possibly in the core of some planets.”

Q-carbon has some unusual characteristics. For one thing, it is ferromagnetic – which other solid forms of carbon are not.

“We didn’t even think that was possible,” Narayan says.

In addition, Q-carbon is harder than diamond, and glows when exposed to even low levels of energy.

Well now they don’t have to go to distant planets or mine meteors to find this stuff 😉  The q-carbon that is.

And we hope you enjoy the video on ferrofluids which was only invented within the last few decades.

thanks to phys.org for the great info

thanks to aip for the great info