The classical colour is light apple green (from South Africa) but the material which is attractive yellow to yellow-green (from Australia) and yellow-green with dark Epidot needles (from central Africa), is now also on the market. Named after Governor Prehn who discovered it in South Africa in the 19th century, this material usually crystallizes in a nodular form on other materials such as chalcedony, basalt or limestone. A rarer crystallized form is in bright green plates. A good Feng Shui stone for bringing order to a cluttered household, encouraging the letting go of possessions. It enhances the visualization process and encourages deeper levels of meditation and dreams. A healing stone for disorders of the bladder, kidneys and bloodstream.