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Johachidolite

Big Photo

Pein Pyit (Painpyit), Mogok, Sagaing District, Mandalay Division, Burma (Myanmar)
© Knut Eldjarn

Show Johachidolite Photos (4)
Formula:
CaAlB
 
3
O
 
7
System:OrthorhombicColour:Colorless to whitish
Lustre:Hardness:7½
Name:Named for its type locality, Johachido District, North Korea, an obsolete Japanese colonial-era name for the locality.
This page provides mineralogical data about Johachidolite.

Classification of Johachidolite

IMA status:Approved
Explanation of status:Redefined in 1977
Strunz 8th edition ID:5/L.03-10
Nickel-Strunz 10th (pending) edition ID:6.CC.05

6 : BORATES
C : Triborates
C : Phyllo-triborates
Dana 8th edition ID:24.5.3.1

24 : ANHYDROUS BORATES
5 : Miscellaneous
Hey's CIM Ref.:10.1.16

10 : Borates with other anions
1 : Borates with halide
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Type Occurrence of Johachidolite

Type Locality:Sangpal-tong, Changbaeng-myon, Kilchu-gun, North Hamgyong Province, North Korea
General Appearance of Type Material:Grains and lamellar masses.
Year of Discovery:1942
Geological Setting of type material:Nepheline dikes traversing limestone.

Physical Properties of Johachidolite

Diaphaneity (Transparency):Transparent
Colour:Colorless to whitish
Streak:White
Hardness (Mohs):7½
Fracture:Sub-Conchoidal
Density (measured):3.4 g/cm3

Crystallography of Johachidolite

Crystal System:Orthorhombic
Cell Parameters:a = 7.96Å, b = 11.72Å, c = 4.37Å
Ratio:a:b:c = 0.679 : 1 : 0.373
Unit Cell Volume:V 407.68 ų (Calculated from Unit Cell)
Morphology:Occurs as grains and lamellar masses.

Optical Data of Johachidolite

Type:Biaxial (+)
RI values: nα = 1.712(2) nβ = 1.717(1) nγ = 1.726(1)
Maximum Birefringence:δ = 0.014

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:relatively strong r> v
Pleochroism:Non-pleochroic

Chemical Properties of Johachidolite

Formula:
CaAlB
 
3
O
 
7
Essential elements:Al, B, Ca, O
All elements listed in formula:Al, B, Ca, O

Relationship of Johachidolite to other Species

Related Minerals - Hey's Index Grouping:

- +
10.1.1Teepleite
Na
 
2
[Cl|B(OH)
 
4
]
10.1.2Bandylite
Cu[Cl|B(OH)
 
4
]
10.1.3Berborite
Be
 
2
[(OH,F)|BO
 
3
] · H
 
2
O
10.1.4Fluoborite
Mg
 
3
[(F,OH)
 
3
|BO
 
3
]
10.1.5Boracite
Mg
 
3
[Cl|B
 
7
O
 
13
]
10.1.6Karlite
Mg
 
7
[(OH,Cl)
 
5
|(BO
 
3
)
 
3
]
10.1.7Shabynite
Mg
 
5
[(Cl,OH)
 
2
|(OH)
 
5
|BO
 
3
] · 4H
 
2
O
10.1.8/9/10Hilgardite
Ca
 
2
B
 
5
O
 
9
Cl·H
 
2
O
10.1.11Solongoite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)(OH)Cl
10.1.12Hydrochlorborite
Ca
 
4
B
 
8
O
 
15
Cl
 
2
·21H
 
2
O
10.1.13Ekaterinite
Ca
 
2
[(Cl,OH)
 
2
|B
 
4
O
 
7
] · 2H
 
2
O
10.1.14Volkovskite
KCa
 
4
[B
 
5
O
 
8
OH]
 
4
[B(OH)
 
3
]
 
2
Cl·4H
 
2
O
10.1.15Chelkarite
CaMgB
 
2
O
 
4
(Cl,OH)
 
2
·5H
 
2
O Or near, with Cl:OH = 3:1
10.1.17Satimolite
KNa
 
2
Al
 
4
[Cl|B
 
2
O
 
5
]
 
3
 · 13H
 
2
O
10.1.18Chambersite
Mn
2+
3
[Cl|B
 
7
O
 
13
]
10.1.19Congolite
(Fe
2+
 
,Mg)
 
3
B
 
7
O
 
13
Cl
10.1.20Ericaite
Fe
2+
3
[Cl|B
 
7
O
 
13
]

Other Names for Johachidolite

Other Languages:
German:Johachidolit
Simplified Chinese:硼铝钙石
Spanish:Johachidolita

Other Information

Fluorescence in UV light:Intense blue fluorescence (UV) due to traces of REE's.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Johachidolite

Reference List:Iwase and Saito (1942) Sci. Papers Inst. Phys. Chem. Res., Tokyo: 39: 300.

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.

American Mineralogist (1977): 62: 327-329.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Milen Kadiyski, Thomas Armbruster, Detlef Guenther, Eric Reusser,
Adolf Peretti. - Johachidolite, CaAl[B3O7], a mineralogical and
structural peculiarity. Eur. J. Mineral. (in press)

Articles/Blogs about Johachidolite

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    Localities for Johachidolite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Burma (Myanmar)
     
    • Mandalay Division
      • Sagaing District
    		http://www.ruby-sapphire.com/r-s-bk-burma2.htm
    North Korea
     
    • 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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