Please help identify and if it’s worth selling

[Asabovesobelow]

Hi fellow rock hounds

This is one of my larger crystals which was passed down to me. I think it is a type quartz but has some unique points with a main flat face and diamond shape faces on various points.
Any info greatly appreciated.
Thanks, Sarah

 

[Dihusky]

Yes a quartz cluster, I find these quite frequently in our area.