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Bikitaite

A valid IMA mineral species - grandfathered
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About BikitaiteHide

Formula:
LiAlSi2O6 · H2O
Colour:
Colorless, White
Lustre:
Vitreous, Sub-Vitreous
Hardness:
6
Specific Gravity:
2.28 - 2.34
Crystal System:
Triclinic
Member of:
Name:
Named in 1957 by Cornelius Searle Hurlbut, Jr. for the type locality at Bikita, Masvingo (Fort Victoria), Masvingo, Zimbabwe (formerly Southern Rhodesia).
Isostructural with:

Unique IdentifiersHide

Mindat ID:
670
Long-form identifier:
mindat:1:1:670:9

IMA Classification of BikitaiteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
LiAlSi2O6·H2O
First published:
1957

Classification of BikitaiteHide

9.GD.55

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
D : Chains of 6-membered rings – tabular zeolites
Dana 7th ed.:
77.2.1.1
77.2.1.1

77 : TECTOSILICATES Zeolites
2 : Zeolite group - related species
16.1.6

16 : Silicates Containing Aluminum and other Metals
1 : Aluminosilicates of Li

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

Physical Properties of BikitaiteHide

Vitreous, Sub-Vitreous
Transparency:
Transparent, Translucent
Colour:
Colorless, White
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on the {100}, Good on the {001}
Fracture:
Conchoidal
Density:
2.28 - 2.34 g/cm3 (Measured)    2.3 g/cm3 (Calculated)

Optical Data of BikitaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.510 nβ = 1.521 nγ = 1.523
2V:
Measured: 45°
Birefringence:
0.013
Max. Birefringence:
δ = 0.013
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:
Low (negative)
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
Optical Extinction:
X^c = 28°, Z=b
Pleochroism:
Non-pleochroic

Chemistry of BikitaiteHide

Mindat Formula:
LiAlSi2O6 · H2O
Element Weights:
Element% weight
O54.872 %
Si27.521 %
Al13.219 %
Li3.401 %
H0.988 %

Calculated from ideal end-member formula.
O
Si
Al
Li
H

Crystallography of BikitaiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 8.606 Å, b = 4.9573 Å, c = 7.597 Å
α = 89.89°, β = 114.42°, γ = 89.96°
Ratio:
a:b:c = 1.736 : 1 : 1.532
Unit Cell V:
295.11 ų
Z:
1
Morphology:
Granular; bladed crystals are rare
Comment:
Originally determined as monoclinic

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006966BikitaiteComodi P, Gatta G D, Zanazzi P F (2003) Effects of pressure on the structure of bikitaite European Journal of Mineralogy 15 247-2552003King's Mountain, North Carolina, USA0.0001293
0006964BikitaiteComodi P, Gatta G D, Zanazzi P F (2003) Effects of pressure on the structure of bikitaite European Journal of Mineralogy 15 247-2552003King's Mountain, North Carolina, USA0.0001293
0006965BikitaiteComodi P, Gatta G D, Zanazzi P F (2003) Effects of pressure on the structure of bikitaite European Journal of Mineralogy 15 247-2552003King's Mountain, North Carolina, USA3.2293
0003191BikitaiteFerro O, Quartieri S, Vezzalini G, Ceriani C, Fois E, Gamba A, Cruciani G (2004) Dehydration dynamics of bikitaite: I. In situ synchrotron powder X-ray diffraction study American Mineralogist 89 94-10120040293
0003190BikitaiteFerro O, Quartieri S, Vezzalini G, Ceriani C, Fois E, Gamba A, Cruciani G (2004) Dehydration dynamics of bikitaite: I. In situ synchrotron powder X-ray diffraction study American Mineralogist 89 94-10120040293
0003189BikitaiteFerro O, Quartieri S, Vezzalini G, Ceriani C, Fois E, Gamba A, Cruciani G (2004) Dehydration dynamics of bikitaite: I. In situ synchrotron powder X-ray diffraction study American Mineralogist 89 94-10120040293
0003188BikitaiteFerro O, Quartieri S, Vezzalini G, Ceriani C, Fois E, Gamba A, Cruciani G (2004) Dehydration dynamics of bikitaite: I. In situ synchrotron powder X-ray diffraction study American Mineralogist 89 94-10120040293
0002910BikitaiteFerro O, Quartieri S, Vezzalini G, Fois E, Gamba A, Tabacchi G (2002) High-pressure behaviour of bikitaite: An integrated theoretical and experimental approach American Mineralogist 87 1415-142520020293
0000394BikitaiteKocman V, Gait R I, Rucklidge J C (1974) The crystal structure of bikitaite, Li[AlSi2O6].H2O American Mineralogist 59 71-7819740293
0002911BikitaiteFerro O, Quartieri S, Vezzalini G, Fois E, Gamba A, Tabacchi G (2002) High-pressure behaviour of bikitaite: An integrated theoretical and experimental approach American Mineralogist 87 1415-142520025.7293
0002912BikitaiteFerro O, Quartieri S, Vezzalini G, Fois E, Gamba A, Tabacchi G (2002) High-pressure behaviour of bikitaite: An integrated theoretical and experimental approach American Mineralogist 87 1415-142520029293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Loading XRD data...
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
9.21 Å(100)
8.04 Å(70)
7.84 Å(80)
6.95 Å(40)
6.84 Å(20)
4.19 Å(40)
4.08 Å(30)
4.03 Å(40)
3.40 Å(20)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
22 : Hydration and low-? subsurface aqueous alteration (see also #23)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
Geological Setting:
Granite pegmatite

Type Occurrence of BikitaiteHide

General Appearance of Type Material:
colorless glassy grains
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA, 106822.
Geological Setting of Type Material:
Granite pegmatite
Associated Minerals at Type Locality:

Other Language Names for BikitaiteHide

Dutch:Bikitaiet
German:Bikitait
Simplified Chinese:硅锂铝石
Spanish:Bikitaita

Relationship of Bikitaite to other SpeciesHide

Member of:
Other Members of Zeolite Group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2OMon. 2 : P21
AmiciteK2Na2Al4Si4O16 · 5H2OMon. 2
Ammonioleucite(NH4)(AlSi2O6)Tet. 4/m : I41/a
AnalcimeNa(AlSi2O6) · H2OTric. 1 : P1
ArzamastseviteK6Al5Si6O20(OH)4ClTet. 42m : I42m
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2OHex.
BoggsiteCa8Na3(Si,Al)96O192 · 70H2OOrth. mmm(2/m2/m2/m) : Imma
Brewsterite SubgroupZeolite Group.
Chabazite-Levyne SubgroupM[Al2Si4O12] · 6H2O
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
Clinoptilolite Subgroup(Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O
CowlesiteCaAl2Si3O10 · 6H2OOrth. mmm(2/m2/m2/m)
Dachiardite SubgroupZeolite Group.
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2OOrth. mmm(2/m2/m2/m) : Pmmn
EdingtoniteBa[Al2Si3O10] · 4H2OOrth. 222 : P212121
EpistilbiteCaAl2Si6O16 · 5H2OMon.
Erionite SubgroupM2[Al4Si14O36] · 15H2O
FabrièsiteNa3Al3Si3O12 · 2H2OOrth. mm2 : Pmm2
Faujasite SubgroupM3.5[Al7Si17O48] · 32H2O
Ferrierite SubgroupName used for unanalysed specimens that could be either ferrierite-K, ferrierite-Mg, ...
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2OMon. 2/m : P21/b
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2OTric. 1 : P1
Garronite Subgroup
GaultiteNa4Zn2Si7O18 · 5H2OOrth. mm2 : Fdd2
Gismondine SubgroupZeolite Group.
Gmelinite SubgroupIn 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
GobbinsiteNa5(Si11Al5)O32 · 11H2OOrth. mmm(2/m2/m2/m) : Pnma
GoosecreekiteCa[Al2Si6O16] · 5H2OMon. 2 : P21
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2OOrth. mmm(2/m2/m2/m) : Cmca
Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
HsianghualiteCa3Li2(Be3Si3O12)F2Iso. 23 : I213
KalborsiteK6Al4BSi6O20(OH)4ClTet. 42m : P421c
KirchhoffiteCs(BSi2O6)Tet. 4/mmm(4/m2/m2/m) : I41/acd
LaumontiteCaAl2Si4O12 · 4H2OMon. 2/m : B2/m
LeuciteK(AlSi2O6)Tet. 4/m : I41/a
LimousiniteBaCa[Be4P4O16] · 6H2OMon. 2/m : P21/b
LithositeK6Al4Si8O25 · 2H2OMon.
Loomisite Ba[Be2P2O8] · H2OMon. m
LovdariteK2Na6Be4Si14O36 · 9H2OOrth. mm2
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
MartinandresiteBa2(Al4Si12O32) · 10H2OOrth. mmm(2/m2/m2/m) : Pmmn
Mazzite SubgroupZeolite Group.
MeieriteBa44Si66Al30O192Cl25(OH)33Iso. m3m(4/m32/m) : Im3m
MerlinoiteK5Ca2(Si23Al9)O64 · 24H2OOrth. mmm(2/m2/m2/m) : Immm
Montesommaite(K,Na)9Al9Si23O64 · 10H2OOrth. mm2 : Fdd2
Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2OOrth.
MountainiteKNa2Ca2[Si8O19(OH)] · 6H2OMon. 2/m : P2/b
MutinaiteNa3Ca4Si85Al11O192 · 60H2OOrth. mmm(2/m2/m2/m) : Pnma
NabesiteNa2BeSi4O10 · 4H2OOrth. 222 : P212121
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2OHex. 6m2 : P6m2
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 23 : I23
ParthéiteCa2(Si4Al4) O15 (OH)2 · 4H2OMon. 2/m : B2/b
Paulingite SubgroupPaulingite was originally described in 1960.
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2OHex. 6/mmm(6/m2/m2/m) : P6/mmm
Phillipsite Subgroup(Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2OIso. m3m(4/m32/m) : Ia3d
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2OTet. 4/mmm(4/m2/m2/m) : I4/mcm
RongibbsitePb2(Si4Al)O11(OH) Mon. 2/m : B2/m
Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2OOrth.
Thomsonite SubgroupThe large majority of "thomsonite" is thomsonite-Ca.
ThornasiteNa12Th4+3(Si8O19)4 · 18H2OTrig. 3m : R3m
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2OTet. 4/mmm(4/m2/m2/m) : P4/mmm
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[Al3Si3O12]4(OH)8 · nH2OIso. m3m(4/m32/m) : Fm3m
'UM1996-38-SiO:AlCaHNa'Na-Ca-Al-Si-O-H
'UM1999-33-SiO:AlHKNa'K7Na5Al12Si20O64 · 24H2O
'UM2002-40-SiO:AlCaHKMgNa'(Mg,Ca,Na,K)7.5(Al12.8Si51.2)O128 · 65H2OTet. 422 : P4122
'Unnamed (Ca analogue of Merlinoite)'(Ca,K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O ?
WairakiteCa(Al2Si4O12) · 2H2OMon. 2/m : B2/m
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2OMon. m : Bb
Wenkite(Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2OHex. 6m2 : P62m
Wilancookite(Ba5Li2◻)Ba6Be24P24O96 · 26H2OIso. 23 : I23
WillhendersoniteKCa[Al3Si3O12] · 5H2OTric. 1 : P1
YugawaraliteCaAl2Si6O16 · 4H2OMon. m : Pb

Common AssociatesHide

Associations Based on Photo Data:
6 photos of Bikitaite associated with FluorapatiteCa5(PO4)3F
4 photos of Bikitaite associated with EosphoriteMn2+Al(PO4)(OH)2 · H2O
2 photos of Bikitaite associated with AlbiteNa(AlSi3O8)
2 photos of Bikitaite associated with 'Apatite'Ca5(PO4)3A
1 photo of Bikitaite associated with RhodochrositeMnCO3
1 photo of Bikitaite associated with FairfielditeCa2Mn2+(PO4)2 · 2H2O

Related Minerals - Strunz-mindat GroupingHide

9.GD.05Gmelinite-CaCa2(Si8Al4)O24 · 11H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
9.GD.05Gmelinite-KK4(Si8Al4O24) · 11H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
9.GD.05Gmelinite-NaNa4(Si8Al4)O24 · 11H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
9.GD.10Chabazite-Mg(Mg0.7K0.5Ca0.5Na0.1)[Al3Si9O24] · 10H2O Trig. 3m(32/m) : R3m
9.GD.10WillhendersoniteKCa[Al3Si3O12] · 5H2OTric. 1 : P1
9.GD.10Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2OTric. 1 : P1
9.GD.10Chabazite-K(K2,Ca,Na2,Sr,Mg)2[Al2Si4O12]2 · 12H2OTrig. 3m(32/m) : R3m
9.GD.10Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2OTrig. 3m : R3m
9.GD.10Chabazite-SrSr2[Al2Si4O12]2 · 12H2OTrig. 3m(32/m) : R3m
9.GD.15Lévyne-Ca(Ca,Na2,K2)[Al2Si4O12] · 6H2OTrig. 3m(32/m) : R3m
9.GD.15Lévyne-Na(Na2,Ca,K2)[Al2Si4O12] · 6H2OTrig. 3m(32/m) : R3m
9.GD.20Erionite-Ca(Ca,K2,Na2)2[Al4Si14O36] · 15H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
9.GD.20Erionite-K(K2,Ca,Na2)2[Al4Si14O36] · 15H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
9.GD.20Erionite-Na(Na2,K2,Ca)2[Al4Si14O36] · 15H2OHex. 6/mmm(6/m2/m2/m) : P63/mmc
9.GD.20Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2OHex.
9.GD.25OffretiteKCaMg(Si13Al5)O36 · 15H2OHex. 6m2 : P6m2
9.GD.25Wenkite(Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2OHex. 6m2 : P62m
9.GD.30Faujasite-Ca(Ca,Na2,Mg)3.5[Al7Si17O48] · 32H2OIso. m3m(4/m32/m) : Fd3m
9.GD.30Faujasite-Mg(Mg,Na2,Ca)3.5[Al7Si17O48] · 32H2OIso. m3m(4/m32/m) : Fd3m
9.GD.30Faujasite-Na(Na2,Ca,Mg)3.5[Al7Si17O48] · 32H2OIso. m3m(4/m32/m) : Fd3m
9.GD.35MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
9.GD.35Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2OOrth.
9.GD.40Dachiardite-KK4(Si20Al4O48) · 13H2OMon.
9.GD.40Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2OMon. 2/m : B2/m
9.GD.40Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2OMon. 2/m : B2/m
9.GD.45EpistilbiteCaAl2Si6O16 · 5H2OMon.
9.GD.50Ferrierite-K(K,Na)5(Si31Al5)O72 · 18H2OOrth. mmm(2/m2/m2/m) : Immm
9.GD.50Ferrierite-Mg[Mg2(K,Na)2Ca0.5](Si29Al7)O72 · 18H2OOrth. mmm(2/m2/m2/m) : Pnnm
9.GD.50Ferrierite-Na(Na,K)5(Si31Al5)O72 · 18H2OMon. 2/m
9.GD.50Ferrierite-NH4(NH4,Mg0.5)5(Al5Si31O72) · 22H2OOrth. mmm(2/m2/m2/m) : Immm

Fluorescence of BikitaiteHide

Not fluorescent in UV, but may be associated with red-fluorescing eucryptite

Other InformationHide

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 BikitaiteHide

References for BikitaiteHide

Reference List:

Localities for BikitaiteHide

Showing 8 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.
Canada
 
  • Ontario
    • Kenora District
      • Paterson Lake Area
Tindle et al. (2002) +1 other reference
Spain
 
  • Canary Islands
    • Santa Cruz de Tenerife Province
      • Tenerife
        • Arico
Dill et al. (2023)
        • Granadilla de Abona
Dill et al. (2023)
Sri Lanka
 
  • North Central Province
    • Anuradhapura District
Chandrakumara et al. (2021)
USA
 
  • North Carolina
    • Cleveland County
      • Kings Mountain
White (1969) +3 other references
Zimbabwe
 
  • Mashonaland East
Goodenough et al. (2025)
  • Masvingo
    • Bikita District
Fernando Brederodes specimen photo ID ...
Hurlbut (1957) +1 other reference
 
and/or  
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