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Tyretskite

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Formula:
Ca2B5O9(OH) · H2O
System:
Triclinic
Colour:
White, light brown
Lustre:
Vitreous
Hardness:
5
Name:
Named after its discovery locality, Tyret' station, Irkutian region, Russia.

Classification of Tyretskite

Approved
6.ED.05

6 : BORATES
E : Pentaborates
D : Tekto-pentaborates
26.5.15.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
9.3.9

9 : Borates
3 : Borates of Ca and Sr

Physical Properties of Tyretskite

Vitreous
Colour:
White, light brown
Streak:
White
Hardness (Mohs):
5

Optical Data of Tyretskite

Type:
Biaxial (+)
RI values:
nα = 1.637 nβ = 1.650 nγ = 1.670
2V:
Measured: 46° , Calculated: 80°
Max Birefringence:
δ = 0.033
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v or r < v

Chemical Properties of Tyretskite

IMA Formula:
Ca2B5O9(OH) · H2O
Elements listed in formula:

Crystallography of Tyretskite

Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Tyretskite-1A
 
 
 
 
 

 
 
 

Type Occurrence of Tyretskite

Relationship of Tyretskite to other Species

Other Members of Group:
HilgarditeCa2B5O9Cl · H2O
KurgantaiteCaSr[B5O9]Cl · H2O
LeucostauritePb2[B5O9]Cl · 0.5H2O
6.ED.05HilgarditeCa2B5O9Cl · H2O
6.ED.05KurgantaiteCaSrB5O9Cl · H2O
9.3.1CalciboriteCaB2O4
9.3.2SibirskiteCaHBO3
9.3.3FabianiteCaB3O5(OH)
9.3.4UralboriteCaB2O2(OH)4
9.3.5VimsiteCaB2O2(OH)4
9.3.6OlshanskyiteCa2[B3O3(OH)6]OH · 3H2O
9.3.7FroloviteCa[B(OH)4]2
9.3.8KorzhinskiteCaB2O4 · 0.5H2O
9.3.10NifontoviteCa3[BO(OH)2]6 · 2H2O
9.3.12InyoiteCaB3O3(OH)5 · 4H2O
9.3.13GoweriteCa[B5O8(OH)][B(OH)3] · 3H2O
9.3.14ColemaniteCaB3O4(OH)3 · H2O
9.3.15PentahydroboriteCaB2O(OH)6 · 2H2O
9.3.16HexahydroboriteCa[B(OH)4]2 · 2H2O
9.3.17MeyerhofferiteCaB3O3(OH)5 · H2O
9.3.18PriceiteCa2B5O7(OH)5 · H2O
9.3.19GinoriteCa2B14O20(OH)6 · 5H2O
9.3.20ProbertiteNaCaB5O7(OH)4 · 3H2O
9.3.21UlexiteNaCaB5O6(OH)6 · 5H2O
9.3.22HydroboraciteCaMg[B3O4(OH)3]2 · 3H2O
9.3.23InderboriteCaMg[B3O3(OH)5]2 · 6H2O
9.3.24WardsmithiteCa5Mg(B4O7)6 · 30H2O
9.3.25HenmiliteCa2Cu[B(OH)4]2(OH)4
9.3.26StrontioboriteSrB8O11(OH)4
9.3.27VeatchiteSr2[B5O8(OH)]2B(OH)3 · H2O
9.3.28Veatchite-ASr2B11O16(OH)5 · H2O
9.3.29 P-VeatchiteSr2B11O16(OH)5 · H2O
9.3.30 BalavinskiteSr2B6O11 · 4H2O
9.3.31TunelliteSrB6O9(OH)2 · 3H2O
9.3.32StrontioginoriteSrCaB14O20(OH)6 · 5H2O

Other Names for Tyretskite

Name in Other Languages:
German:Tyretskit
Simplified Chinese:三斜氯羟硼钙石
Spanish:Tyretskita
Traditional Chinese:三斜氯羥硼鈣石

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 Tyretskite

Reference List:
American Mineralogist (1968): 53: 2084-2087.

American Mineralogist (1985): 70: 636-637.

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

Internet Links for Tyretskite

mindat.org URL:
https://www.mindat.org/min-4069.html
Please feel free to link to this page.

Localities for Tyretskite

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.
Kazakhstan
 
  • Atyrau Province (Atyrau Oblysy; Atyrau Oblast')
    • Atyrau (Gur'yev)
World of Stones #1; Pekov, I. V. & Abramov, D. V. (1993): Boron deposit of the Inder and its minerals. World of Stones, 1, 23-30.
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Lena-Angara salt Basin
Museum Victoria Registration Number: M 33372
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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