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rose gold bracelets for her The best textbook for explaining gems: 방해석

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Calcite is a calcium-containing carbonate mineral. It is a very important mineral in the earth’s crust. It is often used as a teaching material to explain the characteristics of gems, but it is rarely used as jewelry because it has a very high birefringence difference and a perfect solution. 이유, although other gems also have these characteristics, they are not as obvious as calcite: the more common calcite is transparent and colorless iceland spar, followed by nail-head or nail-head with special crystals. Dog-tooth crystal clusters, marble (Marble) is also a kind of calcite, usually opaque block crystals.

Calcite is a calcium-containing carbonate mineral, often mixed with many other metal elements such as magnesium, 철, 망간, 등., so the color of calcite is very many, almost all colors are available. The refractive index of calcite is 1.486-1.658, and the birefringence difference is as high as 0.172. This feature makes it used as a dichroscope in gem instruments to examine the dichroism or pleochroism of birefringent gemstones; In use, it is also widely used as a polarizer. Calcite has three complete sets of cleavage. 그러므로, the crystals of calcite are often in the form of cubes, showing three obvious cleavage surfaces, making it the best teaching material for mineral cleavage.

Iceland Spar is a colorless and transparent calcite crystal, which can best show the strong birefringence phenomenon of calcite. Place the iceland Spar on a lined paper, and the lines underneath clearly become double shadows. This phenomenon can also be observed in other gems with a large difference in birefringence, but it is not as obvious as calcite. 동시에, the three complete sets of cleavage surfaces are completely presented, and the flat surface does not undergo any cutting procedures.

Marble is a metamorphic calcite, which may appear green, 회색, 갈색과 빨간색, mixed with other accessory minerals such as limestone. Sometimes it is not regarded as a kind of calcite, because its composition is more complex, but its Most of the ingredients are still calcite. The use of marble is widely used in building materials. Many buildings use marble for wall tiles or decoration, but seldom used for jewelry.

 

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월별 생산 능력은 최대입니다 50,000 조각 팔찌 목걸이 귀걸이 링 보석.,보석 체인점,콘센트 상점,보석 도매기,트레이더 및 보석 브랜드 회사,Professional은 고품질의 맞춤형 보석 및 대량 생산을 제공합니다. 925 스털링 실버 보석 서비스.