Crystals Tumbled

The colour of fluorite (also called fluorspar) ranges anywhere from an almost clear with green hue to a mix of deep purple and green. Some fluorite even has an aqua colour. 
 

Hematite is polished oxide of iron and is heavily distributed in rocks and soils. It is colored black to steel or silver-gray, brown to reddish brown, or red.

Labradorite, which is named after a major discovery in Labrador, is found in volcanic deposits, also known as spectrolite. Its attractive blue and green iridescence makes it suitable in jewellery and as a glaze for ceramics. 
 

A pink to purple silicate. From the Greek word, lepidos, meaning scale which alludes to the scaly appearance usually common to the mineral. 
 

Prehnite is a silicate which is usually light green to yellow in colour. It is the first mineral to be named after someone; Colenel Hendrik Von Prehn. Prehnite rarely forms distinct crystals, usually it forms as stalactites or botroidals.
 

This angelite from Peru is a form of anhydrate that is blue. It is not a common mineral as it easily alters to the much more common mineral gypsum - from the addition of water to its chemical structure.

Green aventurine is translucent green quartz with chrome mica inclusions. It is often mistaken for jade. The name aventurine derives from the Italian a ventura meaning by chance.