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.
Visit gemdat.org for Unique Identifiers
Mindat ID:
2101
Long-form identifier:
mindat:1:1:2101:8
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 for Standard |
|---|---|---|
| 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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
relatively strong r> v
Pleochroism:
Non-pleochroic
Chemistry of Johachidolite
Mindat Formula:
CaAlB3O7
Element Weights:
Elements listed:
Crystallography of Johachidolite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/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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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.
Other Language Names for Johachidolite
Common Associates
Associations Based on Photo Data:
| 30 photos of Johachidolite associated with 'Hackmanite' | Na8Al6Si6O24Cl2 |
| 26 photos of Johachidolite associated with 'Scapolite' | |
| 19 photos of Johachidolite associated with Feldspar Group | |
| 18 photos of Johachidolite associated with 'Uranothorianite' | (Th,U)O2 |
| 8 photos of Johachidolite associated with Quartz | SiO2 |
| 4 photos of Johachidolite associated with Phlogopite | KMg3(AlSi3O10)(OH)2 |
| 4 photos of Johachidolite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 2 photos of Johachidolite associated with 'Apatite' | Ca5(PO4)3A |
| 1 photo of Johachidolite associated with Apatite Group | |
| 1 photo of Johachidolite associated with Mica 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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References for Johachidolite
Reference List:
Davies, W. O., Machin, M. P. (1968) Johachidolite, a revised chemical formula. American Mineralogist, 53 (11-12) 2082-2083
Aristarain, Lorenzo F., Erd, Richard C. (1977) Johachidolite redefined: a calcium aluminum borate . American Mineralogist, 62 (3-4) 327-329
Localities for Johachidolite
Showing 4 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Myanmar | |
| www.ruby-sapphire.com (2000) +1 other reference |
| - (n.d.) +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