Crystals Tumbled

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.
 

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.
 

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

Rose quartz is a member of the largest family of stones, the silica group, and is composed of silicon dioxide with traces of titanium. 
 

Quartz is a member of the largest family of stones, the silica group, it is the second most abundant mineral in the Earth’s continental crust. Since antiquity, it has been used to make jewellery and carvings.
 

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