Painite is a very rare

borate mineral The borate minerals are minerals which contain a borate anion group. The borate (BO3) units may be polymerised similar to the SiO4 unit of the silicate mineral class. This results in B2O5, B3O6, B2O4 anions as well as more complex structures whic ...

. It was first found in

Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John C. Wells, Joh ...

by British

mineralogist Mineralogy is a subject of geology specializing in the scientific study of the chemistry, crystal structure, and physical (including optical) properties of minerals and mineralized artifacts. Specific studies within mineralogy include the proces ...

and gem dealer Arthur C.D. Pain who misidentified it as

ruby A ruby is a pinkish red to blood-red colored gemstone, a variety of the mineral corundum ( aluminium oxide). Ruby is one of the most popular traditional jewelry gems and is very durable. Other varieties of gem-quality corundum are called sa ...

, until it was discovered as a new gemstone in the 1950s. When it was confirmed as a new mineral species, the mineral was named after him. Due to its rarity, painite can cost in the range of between US$50,000 to $60,000 per carat. The chemical makeup of painite contains

calcium Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to ...

zirconium Zirconium is a chemical element with the symbol Zr and atomic number 40. The name ''zirconium'' is taken from the name of the mineral zircon, the most important source of zirconium. The word is related to Persian '' zargun'' (zircon; ''zar-gun'', ...

boron Boron is a chemical element with the symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the ''boron group'' it has th ...

aluminium Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. I ...

and

oxygen Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as wel ...

(CaZrAl₉O₁₅(BO₃)). The mineral also contains trace amounts of

chromium Chromium is a chemical element with the symbol Cr and atomic number 24. It is the first element in group 6. It is a steely-grey, lustrous, hard, and brittle transition metal. Chromium metal is valued for its high corrosion resistance and hardne ...

and

vanadium Vanadium is a chemical element with the symbol V and atomic number 23. It is a hard, silvery-grey, malleable transition metal. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer ( pas ...

, which are responsible for Painite's typically orange-red to brownish-red color,Painite history at Caltech
Minerals.gps.caltech.edu. Retrieved on 2012-05-28. similar to

topaz Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al Si O( F, OH). It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can mak ...

. The mineral's rarity is due to the fact that zirconium and boron rarely interact with each other in nature. The crystals are naturally

hexagonal In geometry, a hexagon (from Greek , , meaning "six", and , , meaning "corner, angle") is a six-sided polygon. The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°. Regular hexagon A '' regular hexagon'' has ...

in shape, and, until late 2004, only two had been cut into faceted gemstones.Ten gemstones that are rarer than diamond
io9.com

Discovery and occurrence

Extensive exploration in the area surrounding

Mogok Mogok (, ; Shan: , ) is a town in the Thabeikkyin District of Mandalay Region of Myanmar, located north of Mandalay and north-east of Shwebo. History Mogok is believed to have been founded in 1217 by three lost Shan hunters who discovered r ...

, which comprises a large part of the extremely small region the mineral is known to exist in, has identified several new painite occurrences that have been vigorously explored resulting in several thousand new available painite specimens.Painite history at Caltech
Minerals.gps.caltech.edu. Retrieved on 2012-05-28. File:Painite-266170.jpg, Striated, euhedral painite crystal (size: 0.9×0.8×0.7 cm) File:Painite-255206.jpg,

Corundum Corundum is a crystalline form of aluminium oxide () typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral. It is a naturally transparent material, but can have different colors depending on the pres ...

var.

on a large painite crystal,

, Burma. (size: 3.7×3.1×2.3 cm)

References

External links

* {{Gemstone Gemstones Borate minerals Zirconium minerals Aluminium minerals Calcium minerals Hexagonal minerals Minerals in space group 176

Discovery and occurrence

See also

References

External links