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Rock Crystal
It belongs to the quartz group in mineralogy and is a common single crystal quartz gemstone.
。 In simple terms, it means
Quartz crystal with high transparency and good crystal form

。
Chemical composition
The main chemical components are
Silica (SiOSiO)
When pure, it is colorless and transparent.
。 When it contains trace amounts of iron (Fe), aluminum (Al), titanium (Ti) and other impurity elements, it will appear purple, yellow, pink, smoke and other different colors.
。
Physical properties
: The hardness of the crystal is higher, which is Mohs hardness.
7

? The texture is hard, but the performance is brittle.
。 Crystals are often hexagonal prismatic, with transverse striations on the cylindrical surface, and look very regular.
。
The origin of the name
: Its English name "Rock-crystal" comes from the Greek word "Krystallos", meaning "
White ice
The ancients believed that it was water frozen by the cold and would never melt.
。 In ancient China, it also had "
Shui Yu
”、“
Water essence
"Wait for the elegant name."
。
Main varieties
Crystals can be classified into many fascinating varieties based on color and internal inclusions.
：
By color
Amethyst, citrine, smoke crystal (tea crystal), powder crystal (hibiscus stone), black crystal, etc.
By inclusion
Hair crystal (containing needle-like mineral inclusions, such as rutile), water bladder crystal (containing visible liquid inclusions), etc.