a wide range dominated by quartz, jade cufflinks

Basically there are no internal defects among the cufflinks.  The malachite native of Brazil, is a fragile but beautiful stone. Malachite green because the color is exactly like the spots on the peacock feathers and such a beautiful name.
 The ancient Chinese called malachite "Green", "malachite green" or "green enamel mouth. Malachite is an ancient jade material. In the 13th century BC, Yin has been malachite stone hairpin crafts. Because of its bright bluish green, making it one of the most attractive decorative materials in the minerals. The world-famous producer in Zambia, Australia, Namibia, Russia, Zaire, the United States and other countries and regions. China's malachite is mainly produced in Guangdong spring, Daye, Hubei and Jiangxi Northwest. Very slightly included cufflinks is referred to as VS1 or VS2. Expand the Consumer Groups of the cufflinks
Malachite is a copper carbonate mineral is a monoclinic system. The crystal morphology was columnar or needle-like, very rare, usually in the hidden crystal bell milky, massive, hull shape, nodular and fibrous aggregates. You can see very small defects as well as the size of the cufflinks and location.  With concentric layered, fibers radially structure. Green, malachite green, dark green. Pattern often with a silky luster or shiny glass like transparent to opaque. The refractive index of 1.66 to 1.91, 0.25 of the birefringence, pleochroism is a colorless, yellow-green, dark green. Hardness of 3.5 to 4.5, a density of 3.54 g / cm to 4.1 g / cm 3. Brittle, conchoidal to irregular-shaped fracture. Case of hydrochloric acid react, and easily dissolved.
Quartz minerals are widely distributed in the Earth's crust, a wide range dominated by quartz, jade cufflinks. According to the degree of crystallinity (or recognizable degrees) is divided into aphanitic quartz jade cufflinks (chalcedony, agate) and significant crystalline quartz jade cufflinks (quartzite, wood alexandrite, etc.). Quartz jade cufflinks application has a long history, as early as 500,000 years ago, the Zhoukoudian Peking Man cultural sites in the production of stone tools of useful chalcedony. silica showed that the crystals appear, often formed in the outer or inner layer of agate crystal layer, the remaining aqueous solution was enclosed in the empty part of the agate center, and a water tank agate. Slightly included cufflinksis often known as SI1 and SI2.
Fire agate agate with layers containing iron oxide plate-like mineral crystals, flashing red gloss, the formation of stripe morphology was flame-shaped flame stripes can be a variety of colors of the flame bigger and more beautiful, and its economic value higher.