Question

What is the hardest known material?

Answer 1

It is diamond which is a non metal

Answer 2

$\bold\red\LaTeX:--\:AnSwEr$

{ Diamond and Wurtzite }

REASON:---

{ wurtziteboron nitride has a similar structure to diamond, but is made up of different atoms. }

thus, wurtziteboron and diamond are a had d material.

hope it helps:--

T!—!ANKS!!!