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Kurgantaite (Kurgantait)

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Kurgantait
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Kurgantait
weißes, radialstrahliges Aggregate von Kurgantait, Korshunovskoye, Zheleznogorsk, Russland; BB ~ 2 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Sibirien, Föderationskreis/Irkutsk (Irkutskaja), Oblast/Korshunovskoye (Korzunovskoe; Korzhunovska)
Mineral: Kurgantaite
Image: 1584516322
License: Usage for Mineralienatlas project only
Kurgantait

weißes, radialstrahliges Aggregate von Kurgantait, Korshunovskoye, Zheleznogorsk, Russland; BB 2 mm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-03-18
Locality: Korshunovskoye (Korzunovskoe; Korzhunovska) / Irkutsk (Irkutskaja), Oblast / Sibirien, Föderationskreis / Russland

You find additional specimen at the Geolitho Museum

Collectors Summary

Hardness (Mohs) 6.25
Cleavages mittelmäßig in two directions
Fracture uneben
Solubility +++ HCl, - H2O
Crystal System triklin, P1

Chemism

Chemical formula

SrCa[Cl|B5O9]·H2O

Chemical composition

Calcium, Chlor, Strontium, Bor, Sauerstoff, Wasserstoff

Unit weight: 379.221294 u; Number of atoms in the formula: 20

Info

Empirical formula:

SrCa[ClB5O9]·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.53

2

10.00

1.0079470

2.0158940

Boron

B

14.26

5

25.00

10.8117000

54.0585000

Oxygen

O

42.19

10

50.00

15.9994300

159.9943000

Chlorine

Cl

9.35

1

5.00

35.4532000

35.4532000

Calcium

Ca

10.57

1

5.00

40.0784000

40.0784000

Strontium

Sr

23.11

1

5.00

87.6210000

87.6210000

Analysis wt%

CaO : 14.69, SrO : 26.43, B2O3 : 45.31, Cl : 9.58, H2O : 4.60 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 2001)

Strunz 9th edition incl. updates

6.ED.05

6: Borate
E: Pentaborate
D: Gerüst(Tekto)-Pentaborate
05:Hilgardit-Gruppe

Lapis Classification

V/K.04-035

V: NITRATE, CARBONATE UND BORATE
K: Schichtborate mit komplexen Baugruppen [Bx(O,OH)y]

Classification by Hölzel

6.ED.120

6: Borates
E: Pentaborates
D: Tektopentaborates
1: Hilgardite-Group - 5(2P+3T)

IMA status

Neudefinition von der CNMNC anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

max. Birefringence

0.038

Birefringence chart\! Kurgantaite title=Birefringence chart Kurgantaite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.637

RI value β

1.638

RI value γ / ε

1.675

Ri mean

1.650

2V angle

Biaxial (+) 10°<

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

1

Space Group

P1

Cell parameters a (Å)

6.573

Cell parameters b (Å)

6.445

Cell parameters c (Å)

6.369

Cell parameters a/b or c/a

1.020

Cell parameters c/b

0.988

Cell parameters α

61.0

Cell parameters β

61.25

Cell parameters γ

77.18

Z

1

Volume (ų)

206.868

X-Ray Powder Diffraction

5.69(80),
3.22(90),
3.13(70),
2.92(100),
2.84(90),
2.79(80),
2.14(70),
2.07(70)

XRD chart Kurgantaite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.25

VHN (Hardness Vickers)

850 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.99 (gemessen)

3.044 ( ρ calc. Mineralienatlas )

Cleavages

mittelmäßig in two directions

Fracture

uneben

Tenacity

spröde

Instability

+++ HCl, - H2O

Preface

Author (Name, Year)

Yarzhemsky, 1952

References

Zapiski Vserossiskogo Mineralogicheskogo Obshchetstva 130 (2001) (3), 71

Other languages

German

Kurgantait

English

Kurgantaite

French

Kurgantaite

Spanish

Kurgantaíta

Russian

Кургантаит

Traditional Chinese

氯硼鍶鈣石

Simplified Chinese

氯硼锶钙石

Alternative Name

Traditional Chinese

水硼鈣鍶石

Simplified Chinese

水硼钙锶石

CNMNC (IMA)-Number

IMA 2000-B

CNMNC symbol

Symbol

Kga

Locations with GPS information

IDs

GUSID (Global unique identifier short form) TrmhW_jfxEuUNt3wN_yNkA
GUID (Global unique identifier) 5BA1B94E-DFF8-4BC4-9436-DDF037FC8D90
Database ID 2089