Ekaterinite
A valid IMA mineral species
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About Ekaterinite
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 Identifiers
Mindat ID:
1362
Long-form identifier:
mindat:1:1:1362:4
GUID
(UUID V4):
(UUID V4):
946d0d63-0c40-4ed9-af35-d869867eeeee
Classification of Ekaterinite
Approved
First published:
1980
Type description reference:
6.H0.40
6 : BORATES
H : Unclassified borates
0 :
6 : BORATES
H : Unclassified borates
0 :
26.7.3.1
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
10.1.13
10 : Borates with other anions
1 : Borates with halide
10 : Borates with other anions
1 : Borates with halide
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Eka | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ekaterinite
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}
On {0001}
Density:
2.440(5) g/cm3 (Measured) 2.17 g/cm3 (Calculated)
Optical Data of Ekaterinite
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.
and does not take into account mineral colouration.
Surface Relief:
Low
Comments:
2V(meas.) = Very small.
Chemical Properties of Ekaterinite
Formula:
Ca2(B4O7)(Cl,OH)2 · 2H2O
IMA Formula:
Ca2B4O7Cl2 · 2H2O
Crystallography of Ekaterinite
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
High-? alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations |
Type Occurrence of Ekaterinite
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 Ekaterinite
Other Language Names for Ekaterinite
German:Ekaterinit
Spanish:Ekaterinita
Related Minerals - Strunz-mindat Grouping
6.H0.05 | Chelkarite | CaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1 |
6.H0.10 | Braitschite-(Ce) | (Ca,Na2)7(Ce,La)2B22O43 · 7H2O |
6.H0.15 | Satimolite | KNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4 · 4H2O |
6.H0.20 | Iquiqueite | K3Na4Mg(CrO4)B24O39(OH) · 12H2O |
6.H0.25 | Wardsmithite | Ca5Mg[B4O7]6 · 30H2O |
6.H0.35 | Halurgite | Mg4[B8O13(OH)2]2 · 7H2O |
6.H0.45 | Vitimite | Ca6[B14O19](SO4)(OH)14 · 5H2O |
6.H0.50 | Canavesite | Mg2(HBO3)(CO3) · 5H2O |
6.H0.55 | Qilianshanite | NaHCO3 · H3BO3 · 2H2O |
Fluorescence of Ekaterinite
Bluish luminescence and phosphorescence
Other Information
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 Ekaterinite
mindat.org URL:
https://www.mindat.org/min-1362.html
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Please feel free to link to this page.
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References for Ekaterinite
Reference List:
Localities for Ekaterinite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
|
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Korshunovskoye iron deposit, Zheleznogorsk, Irkutsk Oblast, Russia