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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:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (74°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (74°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
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
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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CIF File Best | x | y | z | a | b | c
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Rotation
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Labels
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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 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)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
Please feel free to link to this page.
Please feel free to link to this page.
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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