By Roger R. Harding;R.F. Symes
Кристаллы и Драгоценные камни - информация относительно всех аспектов этой темы .Возраст 10 +This Eyewitness advisor to crystals and gem stones pres details on all facets of this subject, in addition to exhibiting the reader diamonds getting used to chop via a brick wall and the place crystals develop in your house. a long time 10+
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Кристаллы и Драгоценные камни - информация относительно всех аспектов этой темы . Возраст 10 +This Eyewitness consultant to crystals and gem stones pres info on all features of this subject, in addition to exhibiting the reader diamonds getting used to chop via a brick wall and the place crystals develop in your house.
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Extra info for Crystal and Gem (Eyewitness)
It is this which makes it the hardest of all minerals. Evidence suggests that diamonds were formed up to 125 miles (200 km) deep within the earth, and some stones may be as much as three billion years old. Diamonds were first discovered over 2,000 years ago and came mainly from river gravel in India. In 1725, they were found in Brazil, which remained the major source until production in South Africa became significant in 1870. Today, about 20Â€countries produce diamonds. The top producer is Australia, which supplies a quarter of the world’s needs, mainly for industrial purposes (p.
The name is derived from platina, meaning little silver. Platinum is often found in granules or small nuggets in placer deposits. There are major deposits in the USSR, Canada, and S. Africa but most are of very low concentration. RICH LAYER This piece of platinumbearing pyroxenite comes from a layer of igneous rock in South Africa called the Merensky reef. This layer is only about 12 in (30 cm) thick but is very rich in platinum. CROWN OF PLATINUM The crown of Queen Elizabeth the Queen Mother is made of platinum.
Traveling salesman Jean Baptiste Tavernier was a remarkable Frenchman who lived in the 17th century. He traveled in Europe and Asia, buying and selling gems. His accounts of his travels are in such detail that they are used to research the origins of famous diamonds. Cut synthetic ruby 1-carat ruby Carob seed Weight in beans Carob pod Priceless Painite is priceless. Only three crystals are known, and none have yet been on the open market. D. Pain and, when confirmed as a new species, was named after him.