Petrified Wood, Sounds Like Glass?

[Beeba]

I believe this is Petrified Wood, but it's not like my other ones. There appears to be little fractures all over, and when I tap it, it sounds like glass. And there's what looks to me like a black rock in there. Could it be shale, or limestone? 

[Rockwood]

Sorry, this isn't wood. It looks like chert to me. 

[Fin Lover]

I'm not seeing fossilized wood here, either.

[Beeba]

Okay thanks. By the way, do you know why it sounds like glass. 

[Rockwood]

Essentially, it is very much like glass. 

[Samurai]

1 hour ago, Beeba said:

Okay thanks. By the way, do you know why it sounds like glass. 

Chert has a formula of SiO2 with some impurities but almost all sillica 

 

Industrial/common Glass has a majority of about 70%-80% SiO2

 

Edited August 4 by Samurai