Kotoite (original) (raw)
A valid IMA mineral species - grandfathered
About KotoiteHide
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Colour:
Colorless; colorless in transmitted light
Lustre:
Vitreous, Sub-Vitreous
Crystal System:
Orthorhombic
Name:
Named in honor of Bundjirô Kotô (小藤文次郎) (8 April 1856, Iwami Province (now Shimane Prefecture) Japan - 8 March 1935, Tokyo, Japan), geologist and petrographer. He was a Professor of Geology, Science College, Imperial University of Tokyo, who first described the ore deposits of the type locality of Hol Kol.
Type locality has white to colorless masses in dolomite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2262:6
df31da50-b223-465c-a1ba-1c71ad92d2cc
IMA Classification of KotoiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
Classification of KotoiteHide
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6.AA.35
6 : BORATES
A : Monoborates
A : BO3, without additional anions; 1(D).
24.3.2.1
24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
9.2.3
9 : Borates
2 : Borates of Be and Mg
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Ko | 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 KotoiteHide
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Transparency:
Transparent, Translucent
Comment:
Generally low lustered granular
Colour:
Colorless; colorless in transmitted light
Parting:
On {101}. Also exhibits translation gliding.
Density:
3.10 g/cm3 (Measured) 3.06 g/cm3 (Calculated)
Optical Data of KotoiteHide
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RI values:
_n_α = 1.652 _n_β = 1.653 _n_γ = 1.673
2V:
Measured: 21° , Calculated: 26°
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic
Chemistry of KotoiteHide
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Crystallography of KotoiteHide
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Crystal System:
Orthorhombic
Class (H-M):
m m m _(_2/_m_2/_m_2/m ) - Dipyramidal
Cell Parameters:
a = 5.401 Å, b = 8.422 Å, c = 4.507 Å
Ratio:
a:b:c = 0.641 : 1 : 0.535
Unit Cell V:
205.01 ų (Calculated from Unit Cell)
Morphology:
Massive, granular.
Twinning:
On {101} as the twin and composition plane, polysynthetic.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010864 | Kotoite | Effenberger H, Pertlik F (1984) Verfeinerung der kristallstrukturen der isotypen verbindungen M3(BO3)2 mit M=Mg, Co und Ni (strukturtyp: kotoit) Zeitschrift fur Kristallographie 166 129-140 |  |
1984 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.46 Å | (20) |
| 2.67 Å | (100) |
| 2.32 Å | (30) |
| 2.23 Å | (70) |
| 2.18 Å | (80) |
| 1.73 Å | (50) |
| 1.67 Å | (50) |
| 1.52 Å | (30) |
Geological EnvironmentHide
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Type Occurrence of KotoiteHide
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General Appearance of Type Material:
Colorless massive to elongated grains to several mm.
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1938,1286.
Harvard University, Cambridge, Massachusetts, USA, 94750.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 103502.
Geological Setting of Type Material:
Contact metamorphic zone of a granitic intrusion into dolomite.
Associated Minerals at Type Locality:
Reference:
Watanabe, T. (1939) Kotoit, ein neues gesteinsbildenes magnesiumborat. Mineralogische und petrographische Mitteilungen, Vienna: 50: 441-463.
Other Language Names for KotoiteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of KotoiteHide
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Other InformationHide
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Thermal Behaviour:
Melting Point = ~ 1340° C.
Notes:
Readily soluble in warm HCl or H2SO4.
Alters to Szaibelyite under hydrothermal conditions.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Kotoite in petrologyHide
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Internet Links for KotoiteHide
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References for KotoiteHide
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Reference List:
Localities for KotoiteHide
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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
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- 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.