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Umbite

A valid IMA mineral species
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06621270017271927268442.jpg
Umbite

Koashva Open Pit, Koashva Mt, Murmansk Oblast, Russia
04897200017611180364178.jpg
Umbite

Koashva Mt, Murmansk Oblast, Russia
07609050017271927285358.jpg
Umbite

Koashva Open Pit, Koashva Mt, Murmansk Oblast, Russia
06621270017271927268442.jpg
Umbite

Koashva Open Pit, Koashva Mt, Murmansk Oblast, Russia
07306000017575146797840.jpg
Umbite

Koashva Mt, Murmansk Oblast, Russia
07609050017271927285358.jpg
Umbite

Koashva Open Pit, Koashva Mt, Murmansk Oblast, Russia
06621270017271927268442.jpg
Umbite

Koashva Open Pit, Koashva Mt, Murmansk Oblast, Russia
04897200017611180364178.jpg
Umbite

Koashva Mt, Murmansk Oblast, Russia
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About UmbiteHide

Formula:
K2(Zr,Ti)Si3O9 · H2O
Colour:
Colourless, light yellow
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
2.79
Crystal System:
Orthorhombic
Member of:
Umbite Group
Name:
Named after Lake Umb, 20 km east of the type locality.
Dimorph of:
Kostylevite
The Zr analogue of kamenevite.


Unique IdentifiersHide

Mindat ID:
4091
Long-form identifier:
mindat:1:1:4091:0

Similar NamesHide

MumbiteA synonym of 'Plumbomicrolite (of Hogarth 1977)'
UM1970-22-S:BiTeBi9Te4S2
UM1970-23-S:BiTeBi15Te2S8
UM1978-13-S:BiTeBi3Te2S2
UM1980-07-S:BiTeBi3Te2.27S0.73
UM1987-04-O:TiTiO1.71-1.83
UM1991-08-O:TiValid as an unnamed mineralTiO2
UM2000-21-E:TiValid as an unnamed mineralTi
UM2000-41-O:Ti (TiO2-II)TiO2
UM2008-43-S:BiTeValid as an unnamed mineralBi6Te2S
UmiteA synonym of Humite

IMA Classification of UmbiteHide

Classification of UmbiteHide

Strunz-mindat (2026):
9.DG.25

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
Dana 8th ed.:
59.2.1.1

59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
Hey's CIM Ref.:
14.10.16

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf

Mineral SymbolsHide

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

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

Physical Properties of UmbiteHide

Lustre:
Vitreous
Transparency:
Translucent
Colour:
Colourless, light yellow
Hardness:
4½ on Mohs scale
Hardness:
VHN100=305 - 401 - Vickers
Cleavage:
Perfect
On {010}, perfect, micaceous; {100}, less perfect
Density:
2.79 g/cm3 (Measured)    2.79 g/cm3 (Calculated)

Optical Data of UmbiteHide

Type:
Biaxial (-)
RI values:
nα = 1.596(2) nβ = 1.619(2) nγ = 1.63
2V:
Measured: 80° , Calculated: 68°
Max. Birefringence:
δ = 0.034
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r < v weak
Optical Extinction:
X = c; Y = b; Z = a.

Chemistry of UmbiteHide

Mindat Formula:
K2(Zr,Ti)Si3O9 · H2O
Element Weights:
Element% weight
O38.489 %
Zr21.945 %
Si20.269 %
K18.811 %
H0.485 %

Calculated from ideal end-member formula.
O
Zr
Si
K
H
Elements listed:
H, K, O, Si, Ti, Zr - search for minerals with similar chemistry
Common Impurities:
Ti,Hf,Fe,Na,F

Crystallography of UmbiteHide

Crystal System:
Orthorhombic
Class (H-M):
222 - Disphenoidal
Space Group:
P212121
Cell Parameters:
a = 10.208(2) Å, b = 13.241(4) Å, c = 7.174(1) Å
Ratio:
a:b:c = 0.771 : 1 : 0.542
Unit Cell V:
969.67 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Platy crystals, flattened on (010} with the forms {010} (dominant) and {101}, {110}, and {001}.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0012738UmbiteIlyushin G D (1993) New data on the crystal structure of umbite K2ZrSi3O9*H2O Izvestiya Akademii Nauk SSSR Neorganicheskie Materialy 29 971-97519930293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.02 Å(100b)
5.91 Å(90)
2.87 Å(80)
1.797 Å(80b)
3.31 Å(70)
6.56 Å(60b)
2.156 Å(40)
Comments:
Vuonnemiok River Valley, Russia. Data from type description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of UmbiteHide

Type Locality:
ⓘ Vuonnemiok River Valley, Murmansk Oblast, Russia
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia.
Mineralogical Museum, St. Petersburg University, St. Petersburg, Russia, 17072.
Mining Institute, St. Petersburg, Russia, 1631/1.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 82758.
The Natural History Museum, London, England, 1994,35.
Associated Minerals at Type Locality:
AegirineEudialyteK FeldsparKostyleviteWadeite
Reference:
Khomyakov, A.P., Voronkov, A.A., Kobyashev, Y.S., Polezhaeva, L.I. (1983) Umbite and paraumbite, new potassium zirconosilicates from the Khibina alkalic massif. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva, 112. 461-469.

Synonyms of UmbiteHide

Other Language Names for UmbiteHide

Dutch:Umbiet
German:Umbit
Russian:Умбит
Spanish:Umbita

Relationship of Umbite to other SpeciesHide

Member of:
Umbite Group
Other Members of Umbite Group:
KameneviteK2TiSi3O9 · H2OOrth. 222 : P212121
Structurally related to group(s):
Umbite Group

Common AssociatesHide

Associations Based on Photo Data:
1 photo of Umbite associated with VilliaumiteNaF
1 photo of Umbite associated with DjerfisheriteK6(Fe,Cu,Ni)25S26Cl
1 photo of Umbite associated with IlmeniteFe2+TiO3
1 photo of Umbite associated with AegirineNaFe3+Si2O6
1 photo of Umbite associated with MicroclineK(AlSi3O8)
1 photo of Umbite associated with NephelineNa3K(Al4Si4O16)
1 photo of Umbite associated with EudialyteNa15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2

Related Minerals - Strunz-mindat GroupingHide

9.DG.Barrydawsonite-(Y)Na1.5Y0.5CaSi3O8(OH)Mon. 2/m : P21/b
9.DG.ParatobermoriteCa5AlSi5O16(OH) · 5H2OMon. 2/m
9.DG.CalcinaksiteKNaCa(Si4O10) · H2OTric. 1 : P1
9.DG.AlvesiteNaKZrSi6O15 · 2H2OOrth. mmm(2/m2/m2/m)
9.DG.02SteedeiteNaMn2[Si3BO9](OH)2Tric. 1 : P1
9.DG.02NolzeiteNaMn2[Si3BO9](OH)2 · 2H2OTric. 1 : P1
9.DG.05MurakamiiteLiCa2Si3O8(OH)Tric. 1 : P1
9.DG.05SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
9.DG.05BustamiteCaMn2+(Si2O6)Tric. 1 : P1
9.DG.05PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
9.DG.05TanohataiteLiMn2Si3O8(OH)Tric. 1 : P1
9.DG.05DalnegorskiteCa5Mn2+(Si3O9)2Tric. 1 : P1
9.DG.05'Wollastonite-1A'CaSiO3Tric. 1 : P1
9.DG.05WollastoniteCa3(Si3O9)Tric. 1 : P1
9.DG.05FerrobustamiteCaFe2+(Si2O6)Tric. 1
9.DG.05SchizoliteNaCaMnSi3O8(OH)Tric. 1 : P1
9.DG.07CascanditeCaScSi3O8(OH)Tric. 1
9.DG.08PlombièriteCa5Si6O16(OH)2 · 7H2OOrth.
9.DG.10ClinotobermoriteCa5Si6O17 · 5H2OMon.
9.DG.10RiversideiteCa5Si6O16(OH)2 · 2H2O Orth.
9.DG.10TobermoriteCa5Si6O17 · 5H2OMon. 2 : P21
9.DG.12JusiteNa2Ca15Al4Si16O54 · 17H2O
9.DG.12KenotobermoriteCa4Si6O15(OH)2 · 5H2OMon.
9.DG.15FoshagiteCa4(Si3O9)(OH)2Tric. 1 : P1
9.DG.20JenniteCa9(Si3O9)2(OH)8 · 8H2OTric. 1 : P1
9.DG.20KameneviteK2TiSi3O9 · H2OOrth. 222 : P212121
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth. mm2
9.DG.30SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
9.DG.32Escheite Ca2NaMnTi5[Si12O34]O2(OH)3 · 12H2OOrth. mm2 : Ama2
9.DG.35XonotliteCa6(Si6O17)(OH)2Mon. 2/m : B2/m
9.DG.40HillebranditeCa2(SiO3)(OH)2Orth. mmm(2/m2/m2/m) : Cmcm
9.DG.45ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2OOrth.
9.DG.45ChivruaiiteCa4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2OOrth. mmm(2/m2/m2/m) : Cmmm
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2OOrth. 222 : C222
9.DG.55EpididymiteNa2Be2Si6O15 · H2OOrth. mmm(2/m2/m2/m) : Pnma
9.DG.60EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2OOrth.
9.DG.65PatyniteNaKCa4[Si9O23]Tric. 1 : P1
9.DG.67WhelaniteCu2+2Ca6[Si6O17(OH)](CO3)(OH)3 · 2H2OOrth. mm2 : Pnn2
9.DG.70EnricofrancoiteKNaCaSi4O10Tric. 1 : P1
9.DG.70YusupoviteNa2Zr(Si6O15) · 2.5H2OMon. 2/m : B2/m
9.DG.70LitidioniteKNaCuSi4O10Tric. 1 : P1
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)Tric. 1 : P1
9.DG.70ManaksiteKNaMnSi4O10Tric. 1 : P1
9.DG.75SenkevichiteCsKNaCa2TiO[Si7O18](OH)Tric. 1 : P1
9.DG.75TinaksiteK2Na(Ca,Mn2+)2TiO[Si7O18(OH)]Tric.
9.DG.75TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2OMon. m : Bm
9.DG.80CanasiteK3Na3Ca5Si12O30(OH)4Mon. m : Bm
9.DG.85MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
9.DG.90FrankameniteK3Na3Ca5(Si12O30)(F,OH)4 · H2OTric. 1 : P1
9.DG.92Charoite(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2OMon. 2/m : P21/m
9.DG.95YuksporiteK4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3Mon. 2/m : P21/m
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14Mon. 2/m : P2/m

RadioactivityHide

Radioactivity:
Element % Content Activity (Bq/kg) Radiation Type
Uranium (U) 0.0000% 0 α, β, γ
Thorium (Th) 0.0000% 0 α, β, γ
Potassium (K) 18.8114% 5,832 β, γ

For comparison:

  • Banana: ~15 Bq per fruit
  • Granite: 1,000–3,000 Bq/kg
  • EU exemption limit: 10,000 Bq/kg

Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.

Interactive Simulator:

Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!

Activity: –

DistanceDose rateRisk
1 cm
10 cm
1 m

The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).

D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield

Fluorescence of UmbiteHide

In UV light:
Weak yellowish fluorescence under UV. Fluorescence is bright whitish-green at the temperature of liquid nitrogen.

Other InformationHide

IR Spectrum:
IR spectrum shows bands for molecular water.
Thermal Behaviour:
The X-ray pattern of material heated to 500°C is that of wadeite.
Notes:
Readily decomposed by cold 10% HCl, leaving a silica skeleton.
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 UmbiteHide

References for UmbiteHide

Localities for UmbiteHide

Showing 10 localities.

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.
Hide all sections | Show all sections

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
 
  • Murmansk Oblast
    • Eveslogchorr Mt
Arzamastsev et al. (2008)
www.mindat.org (n.d.) +2 other references
Arzamastsev et al. (2008)
33 IGC excursion No 47 +2 other references
Pekov et al. (2004)
    • Lovozersky District
Takai et al. (2011)
Khomyakov et al. (1983) +2 other references
Ferraris et al. (2001) +1 other reference
Pavel M. Kartashov (n.d.)
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