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About JohachidoliteHide

Colorless, white, pale yellow, light green
Specific Gravity:
Crystal System:
Named for its type locality, Johachido District, North Korea, an obsolete Japanese colonial-era name for the locality.

Classification of JohachidoliteHide

Approved, 'Grandfathered' (first described prior to 1959)

C : Triborates
C : Phyllo-triborates

5 : Miscellaneous

10 : Borates with other anions
1 : Borates with halide

Physical Properties of JohachidoliteHide

Colorless, white, pale yellow, light green
7½ on Mohs scale
3.4 g/cm3 (Measured)    

Optical Data of JohachidoliteHide

Biaxial (+)
RI values:
nα = 1.712(2) nβ = 1.717(1) nγ = 1.726(1)
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
relatively strong r> v

Chemical Properties of JohachidoliteHide


Crystallography of JohachidoliteHide

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cell Parameters:
a = 9.767(2) Å, b = 11.723(3) Å, c = 4.3718(5) Å
a:b:c = 0.833 : 1 : 0.373
Unit Cell V:
408.3 ų
Occurs as grains and lamellar masses.

Type Occurrence of JohachidoliteHide

General Appearance of Type Material:
Grains and lamellar masses.
Geological Setting of Type Material:
Nepheline dikes traversing limestone.

Other Language Names for JohachidoliteHide

Simplified Chinese:硼铝钙石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz7 photos of Johachidolite associated with Quartz on mindat.org.
Muscovite4 photos of Johachidolite associated with Muscovite on mindat.org.
Hackmanite3 photos of Johachidolite associated with Hackmanite on mindat.org.
Sodalite1 photo of Johachidolite associated with Sodalite on mindat.org.
Mica Group1 photo of Johachidolite associated with Mica Group on mindat.org.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.1.1TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.2BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.3BerboriteBe2(BO3)(OH,F) · H2OTrig.
10.1.5BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
10.1.8/9/10HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
10.1.12HydrochlorboriteCa4B8O15Cl2 · 21H2OMon.
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2OHex.
10.1.14VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2OTric. 1 : P1
10.1.15ChelkariteCaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1Orth.
10.1.17SatimoliteKNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2OTrig. 3m (3 2/m) : R3m
10.1.18ChambersiteMn2+3(B7O13)ClOrth. mm2 : Pca21
10.1.19Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c

Fluorescence of JohachidoliteHide

Intense blue fluorescence (UV) due to traces of REEs.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for JohachidoliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Iwase, E. and Saito, N. (1942): Johachidolite - a new mineral of hydrous fluoborate of sodium, calcium and aluminium. Scientific Papers of the Institute of Physical and Chemical Research, Tokyo, 39, 300-304.
American Mineralogist (1948): 33: 98.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 384.
Moore, P.B. and Araki, T. (1972): Johachidolite, CaAl[B3O7], a borate with very dense atomic structure. Nature Physical Science, 240, 63-65.
Aristarain, L.F. and Erd, R.C. (1977): Johachidolite redefined: a calcium aluminum borate. American Mineralogist, 62, 327-329.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Peretti, A., Peretti, F., Tun, N.L., Günther, D., Hametner. K., Bieri, W., Reusser, E., Kadiyski, M., Armbruster, T. (2007): Gem quality johachidolite: occurrence, chemical composition and crystal structure. Contrib. Gemol., 2007 (5), 1-53.
Milen Kadiyski, Thomas Armbruster, Detlef Günther, Eric Reusser, Adolf Peretti (2008): Johachidolite, CaAl[B3O7], a mineralogical and structural peculiarity. Eur. J. Mineral. 20, 965-973.

Internet Links for JohachidoliteHide

Localities for JohachidoliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Mandalay Region
    • Pyin-Oo-Lwin District
http://www.ruby-sapphire.com/r-s-bk-burma2.htm; Nobuaki Fukuchi and Hiroharu Mastueda (2009): Johachidolite from Mogok, Myanmar. 2009 Annual Meeting of Japan Association of Mineralogical Sciences, Abstracts Volume, Abs. R4-P10, p. 118.
Knut Eldjarn specimen
Dr. Marcus Origlieri specimens; Ted Themelis (2008) Gems & mines of Mogok
North Korea (TL)
  • North Hamgyong Province
    • Kilchu-gun
      • Changbaeng-myon
Iwase, E. and Saitou, N. (1942) Reports of Scientific Research Institute, 39, 1077.
Mineral and/or Locality  
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