RM031 Bloodstone

Class: 5E (19)
Name: Daniel Mak
Year: 2017 – 2018
地質年代:(化石) (岩石)

化學組成, 鍵及結構:(礦物)

Geological Age: (Fossil) (Rock)

Chemical composition, bonding and structure: (Mineral)

形成:(岩石) (礦物)




Bloodstone, is a variety of jasper or chalcedony which is a cryptocrystalline mixture of quartz. Quartz crystals typically grow in hot watery solutions at temperatures between 100°C and 450°C and often at very high pressures. It can also form in silica-rich molten rock during cooling and solidification. There are many different varieties of quartz, several of which are semi-precious gemstones, bloodstone is one of the examples. It forms at shallow depths and low temperatures by precipitation from silica-rich groundwaters in fractures and cavities.






Bloodstone is a cryptocrystalline quartz. It has a hardness of approximately 7 on the Mohs hardness scale. Some of the bloodstone have the color of deep forest green with a light splatter of sharply contrasting and clearly visible blood-red dots on top. However, usually there are dots, bands, or streaks of white, yellow, orange, and brown.



用途:(岩石) (礦物)

Long time ago, it has been a stone of men’s jewelry. It was often cut with a signet design, mounted into a ring, and used to seal documents and letters. Nowadays, top-quality bloodstone is almost always cut into cabochons. Some is also cut into wands, small sculptures, bowls, and other utility objects. Occasionally it is cut into large faceted stones. A large amount of middle to lower grade material is processed in rock tumblers to produce tumbled stones.

分佈:(岩石) (礦物)



Most of the bloodstone used today is mined and cut in India. It is also found in Armenia, Azerbaijan, Brazil, Bulgaria, China, Australia, and the United States. There is also an outcrop of bloodstone on the Isle of Rum, in Scotland.



More to learn:

For at least two thousand years, many people have believed that bloodstone has “healing and protective properties” that are beneficial to people who own it, wear it, or carry it on their person. It has been thought to control bleeding and inflammation, among other things.

For these reasons many people wear bloodstone rings or pendants as a talisman. Within the past few decades, these beliefs have seen a revival in the United States as part of the New Age movement. There is no scientific or medical evidence that these beliefs have any medical value beyond the placebo effect.