Quote Originally Posted by thebigspendur View Post
Its very difficult to tell most minerals from just looking at them. But if it was quartzite it would have a grainy appearance if you had a rough surface. Beryl is totally different and comes in all shades of green and other colors too.
Yes it is very difficult to tell just by looking.
And as a long time field geologist I know
that quartzite, chert and flint can come in all
shades of color, texture and grain size.

It is a beautiful stone no matter what it is.