Featured large Crystal/rock specimen

hi folks, picked this up at a car boot today, just thought it looked interesting

i'm presuming crystal/quartz as its slightly transparent

anyone have an idea ?

thanks

 

Nice chunk. You thinking green fluorite?

 

not sure buddy, its got to be something like that, looking into it i think fluorite might be too soft

 

luv the colors , they tell of earths history ..geologically

 

Sure looks like raw fluorite to me. Can you scratch it with a steel knife?

 

Fluorite is soft. If all else fails it'll be a pretty doorstop.

 

What does UV do to/for it?

 

Hi mate, yeah it will scratch with a knife, so is a possibilty

 

i thought about that earlier whit but can't find me torch

glows bright green by saber light though

 

My first impression was onyx.

 

The colors are typical of fluorite. Don't use it as a doorstop; fluorite has great cleavage & will easily fracture along molecular planes. And don't keep it in the sun; it can fade.

A rather anemic specimen of rainbow fluorite, I would say.

 

great info thanks bronwen

 

Another positive for fluorite. Never use fluorite as a doorstop.

 

yeah this could take a door no probs Aj, which is why i'm still questioning it being fluorite (a bit)

the base shows a more quartzy look, so perhaps a mix ?

 

it does look a bit beach or nature tumbled as well

 

Fluorite often 'grows' on quartz or other stones.

 

cool, there you go then, think we've cracked it

 

might look lovely polished to show the coloured layers coming through