Krupičkaite
A valid IMA mineral species
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Jiří “George” Krupička
Formula:
Cu6[AsO3(OH)]6 · 8H2O
Colour:
Greenish-blue, occasionally with a grey tint
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
3.123 (Calculated)
Crystal System:
Monoclinic
Name:
Named after professor Jiří “George” Krupička (5 May 1913, Prague, Czech Republic - 24 April 2014, Edmonton, Alberta, Canada), Professor of Geology at the University of Alberta, Edmonton (CA); a polymath: linguist, geologist (and astronomer by education, as well) and writer. Jiří was sentenced and imprisoned as a political inmate by the Communist regime in Czechoslovakia during the 1950s. He spent a part of the sentence in the Jáchymov labor camps.
Structurally and chemically related to geminite, to which it is also visually similar.
Also compare pushcharovskite and yvonite.
Also compare pushcharovskite and yvonite.
Unique Identifiers
Mindat ID:
55044
Long-form identifier:
mindat:1:1:55044:0
GUID
(UUID V4):
(UUID V4):
42b9c14c-8366-4d29-ae4e-8057719fc4b5
IMA Classification of Krupičkaite
Approved
Approval year:
2020
First published:
2021
Classification of Krupičkaite
8.CB.
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
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 |
|---|---|---|
| Kpč | 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 Krupičkaite
Vitreous
Colour:
Greenish-blue, occasionally with a grey tint
Streak:
White
Hardness:
2 on Mohs scale
Comment:
Based on scratch tests
Cleavage:
None Observed
Density:
3.123 g/cm3 (Calculated)
Comment:
Calculated using the empirical formula
Chemistry of Krupičkaite
Mindat Formula:
Cu6[AsO3(OH)]6 · 8H2O
Elements listed:
Crystallography of Krupičkaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 15.504(7) Å, b = 18.144(7) Å, c = 10.563(5) Å
β = 103.30(4)°
β = 103.30(4)°
Ratio:
a:b:c = 0.854 : 1 : 0.582
Unit Cell V:
2891.5 ų
Z:
4
Comment:
Space-group setting P21/n. (Note: The abstract of the original description incorrectly states “P21/m”.)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.089 Å | (100) |
| 4.394 Å | (0.5) |
| 3.909 Å | (0.5) |
| 3.533 Å | (1.0) |
| 3.369 Å | (0.5) |
| 3.244 Å | (0.4) |
| 2.972 Å | (0.9) |
| 2.937 Å | (0.5) |
Type Occurrence of Krupičkaite
General Appearance of Type Material:
Rounded or grape-like aggregates, greenish-blue color, to 4 mm in size, sitting at the surface of the supergene crusts. The aggregates are composed of hundreds of microcrystals that are not larger than a few microns. Inconspicuous in appearance; it can be mistakenly referred to as geminite.
Place of Conservation of Type Material:
mineralogical collections of the Department of Mineralogy and Petrology, National Museum in Prague, Cirkusová 1740, 19300 Prague 9, Czech Republic, catalogue number P1P 18/2020
Associated Minerals at Type Locality:
Reference:
Steciuk, G., Sejkora, J., Čejka, J., Plášil, J., Hloušek, J. (2021) Krupičkaite, Cu6[AsO3(OH)]6·8H2O, a new copper arsenate mineral from Jáchymov (Czech Republic). Journal of Geosciences: 66: 37-50.
Related Minerals - Strunz-mindat Grouping
| 8.CB. | Ermeloite | Al(PO4) · H2O |
| 8.CB.05 | Serrabrancaite | MnPO4 · H2O |
| 8.CB.10 | Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
| 8.CB.10 | Villyaellenite | MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.10 | UM1997-09-AsO:CaHMgZn | (Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.10 | Nyholmite | Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.10 | Miguelromeroite | MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.10 | Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CB.15 | Krautite | Mn(HAsO4) · H2O |
| 8.CB.20 | Cobaltkoritnigite | Co(AsO3OH) · H2O |
| 8.CB.20 | Koritnigite | Zn(AsO3OH) · H2O |
| 8.CB.20 | Magnesiokoritnigite | Mg(AsO3OH) · H2O |
| 8.CB.25 | Yvonite | Cu(HAsO4) · 2H2O |
| 8.CB.30 | Geminite | Cu2+(AsO3OH) · H2O |
| 8.CB.35 | Schubnelite | Fe3+VO4 · H2O |
| 8.CB.40 | Radovanite | Cu2Fe3+(AsO4)(HAs3+O3)2 · H2O |
| 8.CB.45 | Kazakhstanite | Fe3+5V4+3V5+12O39(OH)9 · 9H2O |
| 8.CB.50 | Kolovratite | NixZny(VO4)0.67(x+y) · nH2O |
| 8.CB.60 | Burgessite | Co2(H2O)4[AsO3(OH)]2(H2O) |
| 8.CB.60 | Honzaite | Ni2(AsO3OH)2 · 5H2O |
| 8.CB.65 | Cardite | Zn5.5(AsO4)2(AsO3OH)(OH)3 · 3H2O |
Fluorescence of Krupičkaite
Not fluorescent under long- or short-wave UV
Other Information
Notes:
Visibly insoluble in H2O. Soluble in dilute (10%) HCl, at room temperature.
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 Krupičkaite
mindat.org URL:
https://www.mindat.org/min-55044.html
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References for Krupičkaite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2020) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 56. European Journal of Mineralogy, 32 (4) 443-448 doi:10.5194/ejm-32-443-2020
Localities for Krupičkaite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Czech Republic (TL) | |
| Miyawaki et al. (2020) +1 other reference |
