Thursday, December 6, 2012

Gemstone of the Week: Johachidolite

(Johachidolite image found on

Johachidolite is another very rare gemstone and is named after the Johachido District (an obsolete Japanese colonial-era name for what is now part of North Korea) in 1942.  Johachidolite has a hardness of 7.5 and may be transparent to translucent.  Its colour may be white, colourless, yellow, or pale yellow and has a vitreous luster.  An interesting thing about this gemstone is that some specimens have been known to fluoresce a strong whitish-blue under long-wave UV lighting and pale blue to purple under short-wave UV lighting and some week phosphorescence. It tends to form as orthorhombic dipyramidal crystals and occurs as granular or lamellar masses.  Currently, Johachidolite is only known to be found in North Korea and Burma/Myanmar. Due to the rarity of this gemstone expect to have to pay high prices for faceted gems.