Johachidolite
A valid IMA mineral species - grandfathered
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About Johachidolite
Formula:
CaAlB3O7
Colour:
Colorless, white, pale yellow, light green
Hardness:
7½
Specific Gravity:
3.4
Crystal System:
Orthorhombic
Name:
Named for its type locality, Johachido District, North Korea, an obsolete Japanese colonial-era name for the locality.
Unique Identifiers
Mindat ID:
2101
Long-form identifier:
mindat:1:1:2101:8
GUID
(UUID V4):
(UUID V4):
5535e0b5-22ff-49fb-8156-de9076992028
IMA Classification of Johachidolite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1942
Classification of Johachidolite
6.CC.05
6 : BORATES
C : Triborates
C : Phyllo-triborates
6 : BORATES
C : Triborates
C : Phyllo-triborates
24.5.3.1
24 : ANHYDROUS BORATES
5 : Miscellaneous
24 : ANHYDROUS BORATES
5 : Miscellaneous
10.1.16
10 : Borates with other anions
1 : Borates with halide
10 : Borates with other anions
1 : Borates with halide
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Jhd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Johachidolite
Transparency:
Transparent
Colour:
Colorless, white, pale yellow, light green
Streak:
White
Hardness:
7½ on Mohs scale
Fracture:
Sub-Conchoidal
Density:
3.4 g/cm3 (Measured)
Optical Data of Johachidolite
Type:
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.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong r> v
Pleochroism:
Non-pleochroic
Chemistry of Johachidolite
Mindat Formula:
CaAlB3O7
Elements listed:
Crystallography of Johachidolite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmma
Cell Parameters:
a = 9.767(2) Å, b = 11.723(3) Å, c = 4.3718(5) Å
Ratio:
a:b:c = 0.833 : 1 : 0.373
Unit Cell V:
408.3 ų
Z:
4
Morphology:
Occurs as grains and lamellar masses.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0007267 | Johachidolite | Kadiyski M, Armbruster T, Gunther D, Reusser E, Peretti A (2008) Johachidolite, CaAl[B3O7], a mineralogical and structural peculiarity European Journal of Mineralogy 20 965-973 | 2008 | Mogok district, Myanmar | 0 | 293 | |
0014687 | Johachidolite | Moore P B, Araki T (1972) Johachidolite, CaAl[B3O7], a borate with very dense atomic structure Nature Physical Science 240 63-65 | 1972 | Johachido, North Korea | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.632 Å | (100) |
1.964 Å | (49) |
1.820 Å | (27) |
2.434 Å | (25) |
2.001 Å | (25) |
1.754 Å | (21) |
3.506 Å | (18) |
Comments:
Johachido district, North Korea. The data are from Aristarain and Erd (1977).
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Johachidolite
General Appearance of Type Material:
Grains and lamellar masses.
Geological Setting of Type Material:
Nepheline dikes traversing limestone.
Reference:
Iwase, E., 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.
Other Language Names for Johachidolite
Common Associates
Associated Minerals Based on Photo Data:
8 photos of Johachidolite associated with Quartz | SiO2 |
4 photos of Johachidolite associated with Hackmanite | Na8Al6Si6O24(Cl2,S) |
4 photos of Johachidolite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
4 photos of Johachidolite associated with Phlogopite | KMg3(AlSi3O10)(OH)2 |
2 photos of Johachidolite associated with Apatite | Ca5(PO4)3(Cl/F/OH) |
1 photo of Johachidolite associated with Sodalite | Na4(Si3Al3)O12Cl |
1 photo of Johachidolite associated with Mica Group | |
1 photo of Johachidolite associated with Scapolite | |
1 photo of Johachidolite associated with Apatite Group | |
1 photo of Johachidolite associated with Feldspar Group |
Fluorescence of Johachidolite
Intense blue fluorescence (UV) due to traces of REEs.
Other Information
Thermal Behaviour:
Begins to fuse at about yellow heat, without giving off water. Readily fuses at read heat to a clear hard glass. The fused glass is very slowly soluble in cold l:l HCl.
Notes:
Insoluble or very slightly soluble in strong acids (HF, HCl, aqua regia) or in hot strong alkaline solutions.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Johachidolite
mindat.org URL:
https://www.mindat.org/min-2101.html
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Please feel free to link to this page.
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References for Johachidolite
Reference List:
Localities for Johachidolite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Myanmar | |
| www.ruby-sapphire.com (2000) +1 other reference |
Knut Eldjarn specimen +1 other reference | |
Dr. Marcus Origlieri specimens +1 other reference | |
North Korea (TL) | |
| Iwase et al. (1942) |
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Pein-Pyit, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar