Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Kotoite

This page is currently not sponsored. Click here to sponsor this page.
Big Photo

Nalednoe B Deposit, Tas-Khayakhtakh Range, Dogdo River Basin, Polar Yakutia, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia
© Pavel M. Kartashov

Show Kotoite Photos (4)



Formula:
Mg
 
3
[BO
 
3
]
 
2
System:OrthorhombicColour:Colorless; colorless in ...
Lustre:Vitreous, Sub-VitreousHardness:6½
Name:After Bundjirô Kotô (1856-1935), Japanese geologist and petrographer.
Isostructural with:Jimboite


Type locality has white to colorless masses in dolomite.

Classification of Kotoite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/G.01-10
Nickel-Strunz 10th (pending) edition ID:6.AA.35

6 : BORATES
A : Monoborates
A : BO3, without additional anions; 1(D).
Dana 8th edition ID:24.3.2.1

24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
Hey's CIM Ref.:9.2.3

9 : Borates
2 : Borates of Be and Mg
mindat.org URL:http://www.mindat.org/min-2262.html
Please feel free to link to this page.

Type Occurrence of Kotoite

Type Locality:North orebody (New orebody), Hol Kol Mine (Holgol; Suan; Namjong), Suan-gun, North Hwanghae Province, North Korea
General Appearance of Type Material:Colorless massive to elongated grains to several mm
Year of Discovery:1939
Geological Setting of type material:Contact metamorphic zone of a granitic intrusion into dolomite.
Associated Minerals at type locality:
SzaibélyiteSpinelLudwigiteForsteriteFluoborite
DolomiteClinohumite

Physical Properties of Kotoite

Lustre:Vitreous, Sub-Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Comment:Generally low lustered granular
Colour:Colorless; colorless in transmitted light
Streak:White
Hardness (Mohs):6½
Tenacity:Brittle
Cleavage:Perfect
On {110}
Parting:On {101}. Also exhibits translation gliding.
Density (measured):3.10 g/cm3
Density (calculated):3.06 g/cm3
Comment:D = 3.06-3.09

Crystallography of Kotoite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnnm {P21/n 21/n 2/m}
Cell Parameters:a = 5.401Å, b = 8.422Å, c = 4.507Å
Ratio:a:b:c = 0.641 : 1 : 0.535
Unit Cell Volume:V 205.01 ų (Calculated from Unit Cell)
Z:2
Morphology:Massive, granular.
Twinning:On {101} as the twin and composition plane, polysynthetic.
Comment:Pnmn
X-Ray Powder Diffraction:
d-spacingIntensity
3.46 (20)
2.67 (100)
2.32 (30)
2.23 (70)
2.18 (80)
1.73 (50)
1.67 (50)
1.52 (30)

Optical Data of Kotoite

Type:Biaxial (+)
RI values: nα = 1.652 nβ = 1.653 nγ = 1.673
2V:Measured: 21° , Calculated: 26°
Birefringence:0.021
Maximum Birefringence:δ = 0.021

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

Chemical Properties of Kotoite

Formula:
Mg
 
3
[BO
 
3
]
 
2
Essential elements:B, Mg, O
All elements listed in formula:B, Mg, O

Relationship of Kotoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AA.05Sassolite
H
 
3
BO
 
3
6.AA.15Nordenskiöldine
CaSn
4+
 
[BO
 
3
]
 
2
6.AA.15Tusionite
Mn
2+
 
Sn
4+
 
[BO
 
3
]
 
2
6.AA.35Jimboite
(Mn
2+
 
,Mg)
 
3
[BO
 
3
]
 
2
6.AA.40Takedaite
Ca
 
3
[BO
 
3
]
 
2
Related Minerals - Hey's Index Grouping:

- +
9.2.1Hambergite
Be
 
2
(BO
 
3
)(OH)
9.2.2Suanite
Mg
 
2
[B
 
2
O
 
5
]
9.2.4Szaibélyite
Mg
 
2
[(OH)(B
 
2
O
 
4
(OH))]
9.2.5Preobrazhenskite
Mg
 
3
B
 
11
O
 
15
(OH)
 
9
9.2.6Aksaite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 2H
 
2
O
9.2.7Wightmanite
Mg
 
5
(BO
 
3
)O(OH)
 
5
 · 2H
 
2
O
9.2.8Pinnoite
Mg[B
 
2
O(OH)
 
6
]
9.2.9Kurnakovite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
9.2.10Halurgite
Mg
 
2
[B
 
4
O
 
7
]
 
2
 · 5H
 
2
O
9.2.11Inderite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
9.2.12Hungchaoite
Mg(B
 
4
O
 
7
) · 9H
 
2
O
9.2.13Admontite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 4H
 
2
O
9.2.14Mcallisterite
Mg
 
2
[B
 
6
O
 
7
(OH)
 
6
]
 
2
 · 9H
 
2
O
9.2.15Rivadavite
Na
 
6
Mg[B
 
6
O
 
7
(OH)
 
6
]
 
4
 · 10H
 
2
O
9.2.16Kaliborite
KMg
 
2
H[B
 
6
O
 
8
(OH)
 
5
]
 
2
(H
 
2
O)
 
4
9.2.17Iquiqueite
K
 
3
Na
 
4
Mg(CrO
 
4
)B
 
24
O
 
39
(OH) · 12H
 
2
O

Other Names for Kotoite

Other Languages:
German:Kotoit
Russian:Котоит
Simplified Chinese:粒镁硼石
Spanish:Kotoita

Other Information

Fluorescence in UV light:Not fluorescent
Thermal Behaviour:Melting Point = ~ 1340° C.
Other Information:Readily soluble in warm HCl or H2SO4.

Alters to Szaibelyite under hydrothermal conditions.
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 Kotoite

Reference List:

- +
Mallard (1887) Comptes rendu de l’Académie des sciences de Paris: 105: 1260 (artificial crystals).

Mallard (1887) Annales des mines: 12(8): 427 (artificial crystals).

Mallard (1889) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 15: 650 (artificial crystals).

Watanabe, T. (1939), Kotoit, ein neues gesteinsbildenes magnesiumborat. Mineralogische und petrographische Mitteilungen, Vienna: 50: 441-463.

Watanabe, T. (1939) Mineralogische und petrographische Mitteilungen, Vienna: 51: 162.

Watanabe, T. (1939) Fortschritte der Mineral: 23: clxvi.

American Mineralogist (1939): 24: 406.

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: 328-329.

Zeitschrift für Kristallographie (1984): 16: 129.

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

Internet Links for Kotoite

Search Engines:
  • Look for Kotoite on Google
  • Look for Kotoite images on Google
    • External Links:
  • Look for Kotoite on Webmineral
  • Look for Kotoite on Athena Mineralogy
  • Look for Kotoite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Kotoite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Buy fine minerals and gemstones from Pala International
  • Search for minerals at Heliodor
  • High-end worldwide specimens & outstanding customer service
  • By minerals from YourMineralCollection
  • Find Kotoite on www.crystalclassics.co.uk
  • Rare and Unusual minerals at Mineralogical Research Company
  • Fabre Minerals - search for Kotoite specimens
  • webminerals
  • Edwards Minerals - Fine Specimens
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Pricedownminerals.com - Reverse Auctions and Shop
  • Search for - Kotoite - on e-Rocks Mineral Sales & Auctions
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Kotoite

    The 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.
    Hide Locality List
    (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.
    China
     
    • Guangdong Province
      • Heyuan Prefecture
        • Lianping Co.
    		Anthony, J.W. et al.: Handbook of Mineralogy
    • Hunan Province
      • Hengyang Prefecture
        • Changning Co.
          • Dayishan Sn-polymetallic ore field
    		Yang Guangming, Peng Zhizhong, and Pan Zhaolu (1985): Acta Mineralogica Sinica 5(2), 97-101; Aleksandrov, S.M. (1998): Geochemistry of skarn and ore formation in dolomites. VSP (Utrecht, Tokyo), 300 pp.
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Iwate Prefecture
          • Miyako City
    		Dr. Matsuo Nambu collection (curated at Geological Survey of Japan)
            • Neichi mine
    		Masutomi Museum specimens (Kyoto)
    Watanabe et al (1963) Proceedings of the Japan Academy, series B, 39, 164-169.
    North Korea
     
    • North Hwanghae Province
      • Suan-gun
    		Tschermaks Min.Petr.Mitt.(1939) 50, 441-463; Dana 7:II::323,370,376.
    Watanabe, T. : Boron mineral resources in Korea (in: Geology and Mineral Resources of the Far East, University of Tokyo Press, 1969)
    Tschermaks Min. Petr. Mitt. (1939): 50: 441-463; 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: 323, 328, 370,376.
    Watanabe, T. : Boron mineral resources in Korea (in: Geology and Mineral Resources of the Far East, University of Tokyo Press, 1969)
    Romania
     
    • Bihor Co.
      • Nucet
    		Ş. Marincea: "Suanite in two boron-bearing magnesian skarns from Romania: data on a longtime ignored mineral species", Neues Jahrbuch für Mineralogie - Abhandlungen 182:183-192 (2006)
    Ş. Marincea: "Suanite in two boron-bearing magnesian skarns from Romania: data on a longtime ignored mineral species", Neues Jahrbuch für Mineralogie - Abhandlungen 182:183-192 (2006)
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
    		[World of Stones 12:49]
        • Polar Yakutia
          • Dogdo River Basin
            • Tas-Khayakhtakh Range
              • Izvestkovyi Stream
    		E. Galuskin and N.N. Pertsev analytical data; Galuskina I.O., Kadiyski M., Armbruster T., Galuskin E.V., Pertsev N.N., Dzierzanowski P., Wrzalik R. (2008) A new natural phase in the system Mg2SiO4-Mg2BO3F-Mg2BO3(OH): composition, paragenesis and structure of OH-dominant pertsevite, - Eur. J. Mineral., 20, p. 951-964.
    Pavel M. Kartashov data
    Rudnev, V.V., Chukanov, N.V., Nechelyustov, G.N., Yamnova, N.A. (2007): Hydroxylborite, Mg3(BO3)(OH)3, a new mineral, and the isomorphous fluoborite-hydroxylborite series. Proceedings of the Russian Mineralogical Society, 136(1), 69-82.; Aleksandrov, S.M. (1998): Geochemistry of skarn and ore formation in dolomites. VSP (Utrecht, Tokyo), 300 pp.
        • Verkhoyansk
          • Yana River Basin
            • Dogdo river
    		W. Schreyer et al. (2003) Eur. Journ. Mineral. 15, 1007-1018
    USA
     
    • Washington
      • Snohomish Co.
        • Darrington
          • Jumbo Mountain
    		Minerals of Washington, Bart Cannon, 1975
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 11th Sep 2011 14:05:27
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds