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Alflarsenite

A valid IMA mineral species
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About AlflarseniteHide

Formula:
NaCa2Be3Si4O13(OH) · 2H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.605 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
In honour of the Norwegian self-taught mineralogist, Alf Olav Larsen (1952-), for his extensive contributions to the mineralogy of the syenite pegmatites of the Larvik plutonic complex, Norway.
This page provides mineralogical data about Alflarsenite.


Unique IdentifiersHide

Mindat ID:
38701
Long-form identifier:
mindat:1:1:38701:1

IMA Classification of AlflarseniteHide

Approved
IMA Formula:
NaCa2Be3Si4O13(OH)·2H2O
Approval year:
2008
First published:
2009

Classification of AlflarseniteHide

9.00.

9 : SILICATES (Germanates)
0 :
0 :

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

Physical Properties of AlflarseniteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colorless
Comment:
In aggregates the colour is very pale beige
Streak:
White
Hardness:
Hardness Data:
Estimated
Tenacity:
Very brittle
Cleavage:
None Observed
Parting:
Not observed
Fracture:
Irregular/Uneven
Density:
2.605 g/cm3 (Calculated)

Optical Data of AlflarseniteHide

Type:
Biaxial (+)
RI values:
nα = 1.578 nβ = 1.580 nγ = 1.583
2V:
Measured: 76° to 82°, Calculated: 79°
Birefringence:
Low,0.0005
Max. Birefringence:
δ = 0.005
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:
Moderate (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:
Axial dispersion not observed

Chemistry of AlflarseniteHide

Mindat Formula:
NaCa2Be3Si4O13(OH) · 2H2O
Element Weights:
Element% weight
O50.837 %
Si22.310 %
Ca15.918 %
Be5.369 %
Na4.566 %
H1.001 %

Calculated from ideal end-member formula.
O
Si
Ca
Be
Na
H

Crystallography of AlflarseniteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 7.123(2) Å, b = 19.856(5) Å, c = 9.800(2) Å
β = 111.03(2)°
Ratio:
a:b:c = 0.359 : 1 : 0.494
Unit Cell V:
1291.4 ų
Morphology:
Bladed, flattened on (010) and elongate on [100]. Identified crystal forms are:
major pedions {010} and {010}, major pinacoid {001}, and minor pinacoid {201}.
Twinning:
Occurs on {001}

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006328AlflarseniteGrice J D, Raade G, Cooper M A (2010) Alflarsenite: Structure and relationship to other Be-Si and zeolite framework structures The Canadian Mineralogist 48 255-2662010Larvik plutonic complex, Oslo Region, Norway0293
0007332AlflarseniteRaade G, Grice J D, Cooper M A (2009) Alflarsenite, a new beryllium-silicate zeolite from a syenitic pegmatite in the Larvik plutonic complex, Oslo Region, Norway European Journal of Mineralogy 21 893-9002009Larvik plutonic complex, Oslo Region, Norway0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.095 Å(100)
6.279 Å(42)
4.189 Å(32)
3.972 Å(76)
3.205 Å(37)
2.964 Å(70)
2.915 Å(92)
1.7820 Å(9)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4a: Earth’s earliest continental crust>4.4-3.0
19 : Granitic intrusive rocks

Type Occurrence of AlflarseniteHide

General Appearance of Type Material:
Bladed crystals
Place of Conservation of Type Material:
Holotype in the Natural History Museum, University of Oslo (catalogue number 42108). A small part of the holotype material is housed at the Canadian Museum of Nature, Ottawa (catalogue number CMNMC 86066).
Empirical Formula of Type Material:
(Na0.99Sr0.03K0.01)Σ=1.03Ca2.01Be2.99Si3.98O13(OH) · 2H2O
Chemical Analysis of Type Material:
Na2O6.06 %
K2O0.10 %
BeO14.74 %
CaO22.14 %
SrO0.66 %
BaO0.03 %
Al2O30.04 %
SiO247.04 %
H2O8.86 %
Total:99.67 %
Geological Setting of Type Material:
Syenitic pegmatite
Associated Minerals at Type Locality:

Synonyms of AlflarseniteHide

Other Language Names for AlflarseniteHide

Relationship of Alflarsenite to other SpeciesHide

Member of:
Other Members of Zeolite Group:
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.
BikitaiteLiAlSi2O6 · H2OTric. 1 : P1
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:
2 photos of Alflarsenite associated with CalciteCaCO3

Related Minerals - Strunz-mindat GroupingHide

9.00.Clino-ferri-holmquistite◻Li2(Mg3Fe3+2)(Si8O22)(OH)2Mon. 2/m : B2/m
9.00.MendigiteMn2Mn2MnCa(Si3O9)2Tric. 1 : P1
9.00.Bridgmanite SubgroupABSiO3
9.00.FerroericssoniteBaFe2+2 Fe3+(Si2O7)O(OH) Mon. 2/m : B2/m
9.00.ZvyaginiteNaZnNb2Ti[Si2O7]2(OH,F)3(H2O)4+x (x < 1)Tric. 1 : P1
9.00.BurnettiteCaVAlSiO6Mon. 2/m : B2/b
9.00.Ferrisepiolite(Fe3+,Fe2+,Mg)4((Si,Fe3+)6O15)(O,OH)2 · 6H2OOrth. mmm(2/m2/m2/m)
9.00.YegoroviteNa4[Si4O8(OH)4] · 7H2OMon. 2/m : P21/b
9.00.ChrysotileMg3(Si2O5)(OH)4Mon. m : Bb
9.00.'Shkatulkalita'
9.00.15 va'Chromoamesite'Mg2(Al,Cr)(AlSiO5)(OH)4
9.00.50ThornasiteNa12Th4+3(Si8O19)4 · 18H2OTrig. 3m : R3m

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 AlflarseniteHide

References for AlflarseniteHide

Localities for AlflarseniteHide

Showing 2 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.
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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.
Norway (TL)
 
  • Vestfold
    • Larvik Commune
      • Tvedalen
Raade et al. (2009)
Spain
 
  • Canary Islands
    • Santa Cruz de Tenerife Province
      • Tenerife
Dill et al. (2023)
 
and/or  
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