Tuesday, 12 February 2013

Quartz And Diamond Crystal

IMPURE OF HEART- Colourless rock crystal is the purest form of quartz, the many other colours being caused by impurities. Amethyst and citrine contain iron, rose quartz contains titanium and iron, and smoky quartz contains aluminum.

Quartz And Diamond


QUARTZ IS SILICON DIOXIDE. It occurs as individual crysnd fine-grained masses in a large variety of forms, patterns, and colours. If conditions are right, giant crystals can grow, Brazil being famous for these. The largest recorded rock crystal was about 6 m (20 ft) long and weighed more than 48 tonnes. Other sources of fine quartz include the Swiss Alps, USA, and Madagascar. 

Quartz is tough and has no cleavage making it ideal for carving and cutting and it is widely used as a gemstone. The name quartz usually refers to individual crystals or coarse-grained aggregates while the fine-grained materials are called            chalcedonies or jaspers.

Single crystals


RARE BEAUTY -This 19th-century gold box is set with a superb rare citrine surrounded by a garnet, an amazonite, two pearls, two aquamarines, three agates, and three amethystsThe best-known single crystals of quartz are colourless rock crystal, purple amethyst, rose quartz, smoky quartz, and yellow citrine. These transparent crystals often occur in large enough pieces to be cut as gemstones.

Massive


There are several massive varieties of quartz which are composed of very tiny grains or fibres. Chalcedony such as carnelian, chrysoprase, and agate and jasper are distinguished by the different arrangements of these grains. Tiger's-eye and hawk's-eye form when tiny fibres of asbestos are replaced by quartz and iron oxides.

Diamond


Murchison Snuff Box- This gold box set with diamonds bears a portrait of Tsar Alexander ii of Russia. It was presented in 1867 by the Tsar to Sir Roderick Murchison, the second director of the british geological survey,in recognition of sir roderick’s geological work in Russia.THE NAME DIAMOND is derived from the Greek word adamas meaning "unconquerable", given to the stone because of its supreme hardness. Diamond is made of pure carbon and has an immensely strong crystal structure. It is this which makes it the hardest of all minerals.

Evidence suggests that diamonds were formed up to 200 km (125 miles) deep within the Earth, and some stones may be as much as 3,000 million years old. Diamonds were first discovered over 2,000 years ago and came mainly from river gravels in India.

In 1725, they were found in Brazil which was then the major source until production in South Africa became significant in 1870. Today, about 20 countries produce diamonds. 

Butterfly Brooch: This butterfly brooch is set with over 150 diamonds.   The top producer is Australia, which supplies a quarter of the world's needs, especially for industrial purposes. Diamond has great lustre and fire, properties which are best revealed in the brilliant cut.

Famous diamonds   


Diamonds of exceptional beauty and rarity are highly prized. Some have long, recorded histories while others have inspired fantastic legends. Most belong to the rich and famous.

Writer – Dr.R.F. Symes and Dr.R.R. Harding
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