Most glass is shiny but can be made to look dull.
Naturally it will break with a rough surface, before it is used it is often polished to a smooth surface, large blocks are removed from quarries that have smooth surfaces from the saw.
rough
Smooth.
Shiny
dull
Shiny
The carbon allotrope 'diamond' in its natural un-cut state is dull. however, when a jeweller cuts it , it becomes very shiny; a' girls best friend'. Other allotropes of carbon are graphite - dull, and buckminster fullerene ??? dull or shiny.
Sodium is shiny, but it reacts very quickly with oxygen in the air to form lithium oxide, which is a dull black color.
dull
Shiny
dull
dull
dull
dull
shiny
Shiny.
It is shiny.
It is shiny.
Shiny
Shiny