A series of precious stones 11/32 Description What is peridot? Peridot is derivative from the French term peritot which means […]

A series of precious stones 10/32 Description What is Amethyst? Amethyst can occur as crystals that are six sided on […]

A series of precious stones 9/32 Description Topaz is one of the most precious gems which stand for beauty and […]

A series of precious stones 8/32 Description What is Aquamarine? Aquamarine is one of the most admired and very famous […]

A Series of precious stones 7/32 Description Opal fits into the group of amorphous mineraloids because, unlike the others mineral […]

After a dozen of years from my first book about Sudan “Directory of Major Companies in Sudan – Reference Book”, […]

A Series of Precious Stones 6/32 Description Tourmaline is a crystal silicate mineral compounded with elements such as magnesium , […]

A series of Precious Stones 5/32. Description The spinels are any of a class of minerals of general formulation A2+B23+O42- […]