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Tusionite

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Formula:
Mn2+Sn4+[BO3]2
System:
Trigonal
Colour:
Colourless, Yellow-brown
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 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
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First Recorded Occurrence of Tusionite

Year of Discovery:
1982

Physical Properties of Tusionite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Colourless, Yellow-brown
Hardness (Mohs):
5 - 6

Crystallography of Tusionite

Crystal System:
Trigonal
Cell Parameters:
a = 4.78Å, c = 15.38Å
Ratio:
a:c = 1 : 3.218
Unit Cell Volume:
V 304.33 ų (Calculated from Unit Cell)

Optical Data of Tusionite

Type:
Uniaxial (-)
RI values:
nω = 1.854 nε = 1.752
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

Chemical Properties of Tusionite

Formula:
Mn2+Sn4+[BO3]2
Essential elements:
All elements listed in formula:

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
9.7.9Blatterite(Mn2+,Mg)2(Mn3+,Sb3+,Fe3+)(BO3)O2

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:
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

Localities for Tusionite

(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.
Tajikistan
 
  • 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
Mineral and/or Locality  
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