Johachidolite

Big Photo

Myanmar
0.94 carats
© Palagems

Johachidolite is named after its discovery locality, in the Johachido district, Kenkyohokudo, North Korea.

Johachidolite forms transparent colorless, pale yellow, yellow, orange, brown equant subhedral crystals with vitreous lustre. The material has strong whitish blue fluorescence under LWUV.

The material of ultimate gem quality is reported from the Mogok region.

Johachidolite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 
 

Johachidolite Gemstones by Size

This table shows distribution of Johachidolite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.13 cts
Heaviest:0.94 cts
Average:0.34 cts
Total photos:9
Do you have a larger Johachidolite? Why not upload a photo?
0.13ct to 0.21ct0.21ct to 0.29ct0.29ct to 0.37ct0.37ct to 0.45ct0.45ct to 0.54ct0.54ct to 0.62ct0.62ct to 0.70ct0.70ct to 0.78ct0.78ct to 0.86ct0.86ct to 0.94ct
General Information
Chemical Formula
CaAlB
 
3
O
 
7
Michael O’Donoghue, Gems, Sixth Edition (2006)
Photos of natural/un-cut material from mindat.org
Physical Properties of Johachidolite
Mohs Hardness7.5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Specific Gravity3.45
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Optical Properties of Johachidolite
Refractive Index1.717 to 1.724
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Optical CharacterBiaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Birefringence0.007
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Colour
Colour (General)Yellow
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
TransparencyTransparent,Translucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Fluorescence & other light emissions
Fluorescence (Short Wave UV)A weak blue
Michael O’Donoghue, Gems, Sixth Edition (2006)
Fluorescence (Long-Wave UV)A strong whitish blue fluorescence
Michael O’Donoghue, Gems, Sixth Edition (2006)
Crystallography of Johachidolite
Crystal SystemOrthorhombic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
HabitEquant subhedral crystals
Michael O’Donoghue, Gems, Sixth Edition (2006)
Geological Environment
Where found:Occurs in a nepheline dike cutting limestone
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Johachidolite information at mindat.org
Significant Gem Localities
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 420
        • Pein-Pyit (Painpyit; Pyan Pyit)
Ted Themelis (2008) Gems & mines of Mogok
North Korea
 
  • North Hamgyong Province
    • Kilchu-gun
      • Changbaeng-myon
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 420
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