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Tusionite

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Formula:
Mn2+Sn4+[BO3]2
System:
Trigonal
Colour:
Colourless, ...
Lustre:
Vitreous
Hardness:
5 - 6
Name:
Named after its discovery locality, Tusion River valley, Pamir Mountains, Tajikistan.
This page provides mineralogical data about Tusionite.


Classification of Tusionite

Approved
Approval Year:
1982
6.AA.15

6 : BORATES
A : Monoborates
A : BO3, without additional anions; 1(D).
24.3.3.2

24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
9.7.10

9 : Borates
7 : Borates of Mn

Physical Properties of Tusionite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Colourless, Yellow-brown, honey yellow
Hardness (Mohs):
5 - 6
Hardness (Vickers):
VHN40=400 - 750 kg/mm2
Comment:
VH 400-500 on (001); 700-750 perpendicular to (001)
Cleavage:
Perfect
(001)
Density:
4.73 g/cm3 (Measured)    4.85 g/cm3 (Calculated)

Optical Data of Tusionite

Type:
Uniaxial (-)
RI values:
nω = 1.854() nε = 1.752(2)
Max Birefringence:
δ = 0.102
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Colour in reflected light:
grayish white

Chemical Properties of Tusionite

Formula:
Mn2+Sn4+[BO3]2
IMA Formula:
Mn2+Sn4+(BO3)2
Elements listed in formula:

Crystallography of Tusionite

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 4.781(1) Å, c = 15.381(7) Å
Ratio:
a:c = 1 : 3.217
Unit Cell Volume:
V 304.48 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Thin platy crystals, to 1.5 cm, in rosettelike aggregates.
X-Ray Powder Diffraction Data:
d-spacingIntensity
5.12 (4)
4.02 (4)
3.65 (9)
2.818 (10)
2.393 (6)
1.999 (6)
1.744 (8)

Type Occurrence of Tusionite

Geological Setting of Type Material:
Miarolitic granite pegmatite

Relationship of Tusionite to other Species

6.AA.05SassoliteH3BO3
6.AA.15NordenskiöldineCaSn4+[BO3]2
6.AA.35Jimboite(Mn2+,Mg)3[BO3]2
6.AA.35KotoiteMg3[BO3]2
6.AA.40TakedaiteCa3[BO3]2
9.7.1Pinakiolite(Mg,Mn2+)2Mn3+(BO3)O2
9.7.2Orthopinakiolite(Mg,Mn2+)2Mn3+(BO3)O2
9.7.3Jimboite(Mn2+,Mg)3[BO3]2
9.7.4SussexiteMn2+BO2(OH)
9.7.5Wiserite(Mn,Mg)14[Cl|(OH)8|(Si,Mg)(O,OH)4|(B2O5)4]
9.7.6KurchatoviteCa(Mg,Mn2+)[B2O5]
9.7.7ClinokurchatoviteCa(Mg,Fe2+,Mn2+)[B2O5]
9.7.8Takéuchiite(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2
9.7.9BlatteriteSb5+(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32

Other Names for Tusionite

Name in Other Languages:
German:Tusionit
Spanish:Tusionita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tusionite

Reference List:
Konovalenko, S. I., Voloshin, A. V., Pakhomovskiy, Y. A., Anen'yev, S. S., Perlina, G. A., Rogachev, D. L., & Kuznetsov, V. Y. (1984). Tusionite, MnSn (BO3) 2, A New Borate from Granite Pegmatite of Southwestern Pamir. International Geology Review, 26(4), 481-485. also Doklady Akademii Nauk SSSR (1983): 272: 1449-1453.

American Mineralogist (1984): 69: 1193.

Canadian Mineralogist (1994): 32: 903-908.

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

Internet Links for Tusionite

mindat.org URL:
https://www.mindat.org/min-4062.html
Please feel free to link to this page.

Localities for Tusionite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • Vysočina Region
Novák, M.: Bór obsahující minerály z granitických pegmatitů moldanubika. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1995, roč. 3, s. 164-169.
Myanmar
 
  • Shan State
    • Kyaukme District
      • Momeik Township
        • Molo quarter
          • Khetchel village (Cache village; Khat Che village)
Danisi, R.M., Armbruster, T., Wang, H., Günther, D., Nagashima, M., Reusser, E. and Bieri, W. (2015) Perettiite-(Y), IMA 2014-109. CNMNC Newsletter No. 25, June 2015, page 533; Mineralogical Magazine, 79, 529-535.
Tajikistan (TL)
 
  • Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni)
    • Pamir Mts
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Konovalenko, S. I., Voloshin, A. V., Pakhomovskiy, Y. A., Anen'yev, S. S., Perlina, G. A., Rogachev, D. L., & Kuznetsov, V. Y. (1984). Tusionite, MnSn (BO3) 2, A New Borate from Granite Pegmatite of Southwestern Pamir. International Geology Review, 26(4), 481-485.
Mineral and/or Locality  
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