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Ekaterinite

A valid IMA mineral species
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About EkateriniteHide

05659830015831968446252.jpg
Ekaterine V. Rozhkova
Formula:
Ca2(B4O7)(Cl,OH)2 · 2H2O
Colour:
white, white with slight rose tint
Lustre:
Pearly
Hardness:
1 - 1½
Specific Gravity:
2.440
Crystal System:
Hexagonal
Name:
Named in honor of Ekaterina Vladimirovna Rozhkova (Екатерина Владимировна Рожкова) (1898–1979), Russian mineralogist, Research Institute of Mineral Resources, Moscow, Russia.
This page provides mineralogical data about Ekaterinite.


Unique IdentifiersHide

Mindat ID:
1362
Long-form identifier:
mindat:1:1:1362:4
GUID
(UUID V4):
946d0d63-0c40-4ed9-af35-d869867eeeee

Classification of EkateriniteHide

Approved
First published:
1980
6.H0.40

6 : BORATES
H : Unclassified borates
0 :
26.7.3.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
10.1.13

10 : Borates with other anions
1 : Borates with halide

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
EkaIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of EkateriniteHide

Pearly
Transparency:
Transparent, Translucent
Colour:
white, white with slight rose tint
Hardness:
1 - 1½ on Mohs scale
Comment:
Slightly above 1
Cleavage:
Distinct/Good
On {0001}
Density:
2.440(5) g/cm3 (Measured)    2.17 g/cm3 (Calculated)

Optical Data of EkateriniteHide

Type:
Uniaxial (-)
RI values:
nω = 1.577 nε = 1.574
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Comments:
2V(meas.) = Very small.

Chemical Properties of EkateriniteHide

Formula:
Ca2(B4O7)(Cl,OH)2 · 2H2O
IMA Formula:
Ca2B4O7Cl2 · 2H2O

Crystallography of EkateriniteHide

Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P6
Cell Parameters:
a = 11.86 Å, c = 23.88 Å
Ratio:
a:c = 1 : 2.013
Unit Cell V:
2,908.94 ų (Calculated from Unit Cell)
Z:
6
Comment:
Point Group: 6 (?).; Space Group: P6 (?).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.31 Å(100)
1.916 Å(100)
2.047 Å(99)
2.09 Å(98)
1.281 Å(97)
2.51 Å(93)
1.166 Å(87)

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of EkateriniteHide

General Appearance of Type Material:
rose-foliated aggregates
Place of Conservation of Type Material:
Mining Institute, St. Petersburg, 1224/1; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 80173; National Museum of Natural History, Washington, D.C., USA, 160242, 160482.
Geological Setting of Type Material:
iron deposit
Associated Minerals at Type Locality:
Reference:
Malinko, S.V., Kuznetsova, N.N., Cherkasova, L.E. (1980) Ekaterinite, a new boron mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 109(4): 469-476.

Synonyms of EkateriniteHide

Other Language Names for EkateriniteHide

German:Ekaterinit
Spanish:Ekaterinita

Related Minerals - Strunz-mindat GroupingHide

6.H0.05ChelkariteCaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1Orth. mmm (2/m 2/m 2/m) : Pbca
6.H0.10Braitschite-(Ce)(Ca,Na2)7(Ce,La)2B22O43 · 7H2OHex. 6/m : P6/m
6.H0.15SatimoliteKNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4 · 4H2OTrig. 3m (3 2/m) : R3m
6.H0.20IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2OTrig. 3m : P3 1c
6.H0.25WardsmithiteCa5Mg[B4O7]6 · 30H2OHex.
6.H0.35HalurgiteMg4[B8O13(OH)2]2 · 7H2OMon. 2/m : P2/b
6.H0.45VitimiteCa6[B14O19](SO4)(OH)14 · 5H2OMon.
6.H0.50CanavesiteMg2(HBO3)(CO3) · 5H2OMon.
6.H0.55QilianshaniteNaHCO3 · H3BO3 · 2H2OMon. 2 : B2

Fluorescence of EkateriniteHide

Bluish luminescence and phosphorescence

Other InformationHide

IR Spectrum:
borehole material [cm-1]: 3570sh, 3550, 3420, 1660w, 1193s, 1123s, 1062s, 1026, 958s, 882, 837w, 784s, 711w, 683w, 620w, 540, 499, 457, 426
Notes:
Hygroscopic with swelling, soluble in H2O
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for EkateriniteHide

References for EkateriniteHide

Reference List:

Localities for EkateriniteHide

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Irkutsk Oblast
    • Zheleznogorsk
 
Mineral and/or Locality  
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