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Kurgantaite

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About KurgantaiteHide

Formula:
CaSr[B5O9]Cl · H2O
Colour:
Colourless to white
Lustre:
Vitreous
Hardness:
6 - 6½
Specific Gravity:
2.99
Crystal System:
Triclinic
Name:
named for the type locality, Kargan-tau, Kazakhstan
Hilgardite Group.

1952 described as a new mineral, 1982 discredited as a strontian variety of tyretskite, 2000 revalidated and approved by the IMA.


Classification of KurgantaiteHide

Approved, 'Grandfathered' (first described prior to 1959)
Approval Year:
2002
6.ED.05

6 : BORATES
E : Pentaborates
D : Tekto-pentaborates

Physical Properties of KurgantaiteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless to white
Streak:
white
Hardness:
6 - 6½ on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Fracture:
Irregular/Uneven
Density:
2.99 g/cm3 (Measured)    3.04 g/cm3 (Calculated)

Optical Data of KurgantaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.637 nβ = 1.638 nγ = 1.675
2V:
Calculated: 19°
Max Birefringence:
δ = 0.038
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of KurgantaiteHide

Formula:
CaSr[B5O9]Cl · H2O
IMA Formula:
CaSrB5O9Cl · H2O

Crystallography of KurgantaiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 6.573 Å, b = 6.445 Å, c = 6.369 Å
α = 60.995°, β = 61.257°, γ = 77.191°
Ratio:
a:b:c = 1.02 : 1 : 0.988
Unit Cell V:
206.9 ų
Z:
1

Type Occurrence of KurgantaiteHide

General Appearance of Type Material:
Fine-grained nodules up to 4 cm across.
Geological Setting of Type Material:
in a borate deposit

Synonyms of KurgantaiteHide

Other Language Names for KurgantaiteHide

German:Kurgantait
Spanish:Kurgantaita
Traditional Chinese:氯硼鍶鈣石
水硼鈣鍶石

Relationship of Kurgantaite to other SpeciesHide

Other Members of this group:
HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
LeucostauritePb2[B5O9]Cl · 0.5H2OOrth. mm2 : Pnn2
TyretskiteCa2B5O9OH · H2OTric.

Related Minerals - Nickel-Strunz GroupingHide

6.ED.05HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
6.ED.05TyretskiteCa2B5O9OH · H2OTric.

Other InformationHide

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 KurgantaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Yarzhemsky, Ya.Ya. (1952): Kurgantaite – a new borate mineral.- Mineral. Sbornik, Lvov Geol. Obshchest. 6, 169-174 (in Russian).
Pekov, I.V., E.V. Lovskaya, N.V. Chukanov, A.E. Zadov, V.N. Appolonov, D.Yu. Pushcharovsky, O. Ferro & S.A. Vinogradova (2001): Kurgantaite CaSr(B3O9)Cl · H2O: revalidation of the mineral species and new data.- Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 130(3), 71-79 (in Russian).
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for KurgantaiteHide

Localities for KurgantaiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
CM 43, 1469-1487
Grice, J.D., Gault, R.A., Van Velthuizen, J., and Pratt, A. (2002) Walkerite: a new borate mineral species in an evaporitic sequence from Sussex, New Brunswick. Canadian Mineralogist: 40: 1675-1686.
China
 
  • Tibet
    • Ngari
      • Gê'gyai Co. (Geji Co.)
Anthony, J.W. et al.: Handbook of Mineralogy
Kazakhstan
 
  • Aktobe Region
    • Shalkar
      • Aksai Valley
I.V. Pekov et al. (2001) Zap. Vser. Min. Ob. 130(3), 71-79 (in russ.).; Коротченкова, О. В., & Чайковский, И. И. (2016). БОРНЫЕ МИНЕРАЛЫ ЧЕЛКАРСКОГО МЕСТОРОЖДЕНИЯ. Проблемы минералогии, петрографии и металлогении. Научные чтения памяти ПН Чирвинского, (19), 55-65.
  • Atyrau Region
    • Inder
      • Inder B deposit and salt dome
I.V. Pekov et al. (2001) Zap. Vser. Min. Ob. 130(3), 71-79 (in russ.).
Russia
 
  • Irkutsk Oblast
AmMin 87:1509-1512
    • Lower Tunguska
      • Nepa River basin
I.V. Pekov et al. (2001) Zap. Vser. Min. Ob. 130(3), 71-79 (in russ.).
 
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