The hilt is an unknown black material, hard but also comfortable.

Now prepare for liquid-state technology, a new class of materials unknown in nature.

Or did they mark the landing strips with a raw material unknown to us?

He carried a 6' striking staff of unknown materials.

Next, the teacher should read the material, because unknown material cannot be taught.

His mouthpiece was made from unknown material similar to plastic but much stronger.

It seems pointless to give people what they already have, especially when there's a vast amount of great, relatively unknown material to choose from.

Analysis is a way to experience and integrate the unknown material.

The aliens were dressed in garments of an unknown material.

The unknown material fell again a reported six more times in the Oakville area.