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. 
 

Honey calcite is also known as amber or gold calcite. Calcite is composed of the same material as limestone: calcium carbonate. This transparent crystal can be found in a variety of colours, such as honey, when it is charged with impurities.
 

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.

Black is one of the many colours of tourmaline. However, since it is pleochroic, it might be green when viewed along a different axis.