Keiviite-(Y) (original) (raw)
A valid IMA mineral species
About Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
Colour:
Colorless to white
Crystal System:
Monoclinic
Name:
Named for its relationship to keiviite-(Yb), with Y dominant over Yb and written according to the IMA nomenclature for rare earth element minerals.
Unique IdentifiersHide
This section is currently hidden. Click the show button to view.
Long-form identifier:
mindat:1:1:2177:3
b31a2636-daeb-4249-8ec7-664fae3266c9
IMA Classification of Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
Type description reference:
Classification of Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
9.BC.05
9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
55.2.1a.2
55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
2 : Si2O7 Groups, Generally with no Additional Anions with cations in [6] coordination
14.8.2
14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al
Mineral SymbolsHide
This section is currently hidden. Click the show button to view.
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Kvi-Y | 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 Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
Colour:
Colorless to white
Hardness:
VHN20=1400 kg/mm2 - Vickers
Fracture:
Irregular/Uneven
Density:
4.45 g/cm3 (Measured) 4.48 g/cm3 (Calculated)
Optical Data of Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
RI values:
_n_α = 1.713(1) _n_β = 1.748(1) _n_γ = 1.758(1)
2V:
Measured: 55° to 56°, Calculated: 54°
δ = 0.045
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Chemistry of Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
Crystallography of Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 6.845(5) Å, b = 8.960(5) Å, c = 4.734(3) Å
β = 101.65(5)°
Ratio:
a:b:c = 0.764 : 1 : 0.528
Unit Cell V:
284.36 ų (Calculated from Unit Cell)
Comment:
Space group by analogy to keiviite-(Yb)
X-Ray Powder DiffractionHide
This section is currently hidden. Click the show button to view.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.23 Å | (100) |
| 4.65 Å | (90) |
| 3.04 Å | (80) |
| 2.280 Å | (70) |
| 5.40 Å | (50) |
| 2.729 Å | (50) |
| 2.692 Å | (50) |
| 1.841 Å | (50) |
| 1.685 Å | (50) |
Comments:
Mt. Ploskaya, Russia. Data from the type description.
Geological EnvironmentHide
This section is currently hidden. Click the show button to view.
Type Occurrence of Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
General Appearance of Type Material:
Prismatic crystals, 0.05 to 1 mm long and less than 0.15 mm thick.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia, 5958/6.
Mining Institute, St. Petersburg, Russia, 1343-1/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
Associated Minerals at Type Locality:
Reference:
Voloshin, A.V., Pakhomovsky, Y.A., Tyusheva, F.N. (1985) Keiviite-(Y) - A new yttrian diorthosilicate, and thalenite from amazonite pegmatites of the Kola Peninsula. Diortho- and triorthosilicates of yttrium. Mineralogiceskij Zhurnal: 7: 79-94.
Synonyms of Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
Other Language Names for Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
Relationship of Keiviite-(Y) to other SpeciesHide
This section is currently hidden. Click the show button to view.
Other Members of this group:
Common AssociatesHide
This section is currently hidden. Click the show button to view.
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
This section is currently hidden. Click the show button to view.
Fluorescence of Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
No fluorescence; yellow-green cathodoluminescence.
Other InformationHide
This section is currently hidden. Click the show button to view.
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 Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
References for Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
Reference List:
Hawthorne, Frank C., Burke, Ernst A. J., Ercit, T. Scott, Grew, Edward S., Grice, Joel D., Jambor, John L., Puziewicz, Jacek, Roberts, Andrew C., Vanko, David A. (1988) New Mineral Names. American Mineralogist, 73 (1-2) 189-199
Allix, M., Alba, M. D., Florian, P., Fernandez-Carrion, A. J., Suchomel, M. R., Escudero, A., Suard, E., Becerro, A. I. (2011) Structural elucidation of β-(Y,Sc)2Si2O7: combined use of 89Y MAS NMR and powder diffraction. Journal of Applied Crystallography, 44 (4). 846-852 doi:10.1107/s0021889811021303
Localities for Keiviite-(Y)Hide
This section is currently hidden. Click the show button to view.
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 section is currently hidden. Click the show button to view.
- 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.