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Alflarsenite

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Formula:
NaCa2Be3Si4O13(OH) · 2H2O
System:
Monoclinic
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4
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.


Classification of Alflarsenite

Approved
Approval Year:
2008
First Published:
2009
9.00.

9 : SILICATES (Germanates)
0 :
0 :

Physical Properties of Alflarsenite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colorless
Comment:
In aggregates the colour is very pale beige
Streak:
White
Hardness (Mohs):
4
Hardness Data:
Estimated
Tenacity:
Very brittle
Cleavage:
None Observed
Parting:
Not observed
Fracture:
Irregular/Uneven
Density:
2.605 g/cm3 (Calculated)

Optical Data of Alflarsenite

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
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Axial dispersion not observed

Chemical Properties of Alflarsenite

Formula:
NaCa2Be3Si4O13(OH) · 2H2O
IMA Formula:
NaCa2Be3Si4O13(OH) · 2H2O
Elements listed in formula:
Analytical Data:
From type description. Chemical analysis based on combination of data from EMP and ICP-OES analysis
Na2O (6.06)
K20 (0.10)
BeO (14.74)
CaO (22.14)
SrO (0.66)
Al2O3 (0.04)
BaO (0.03)
SiO2 (47.04)
H2O (8.86) **
Total 99. 67 wt %
** Calculated to give 5 H atoms in the empirical formula.

Crystallography of Alflarsenite

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Space Group 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 Volume:
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}
X-Ray Powder Diffraction Data:
d-spacingIntensity
9.095 (100)
6.279 (42)
4.189 (32)
3.972 (76)
3.205 (37)
2.964 (70)
2.915 (92)
1.7820 (9)

Occurrences of Alflarsenite

Paragenetic Mode(s):
•  Syenite

Type Occurrence of Alflarsenite

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).
Geological Setting of Type Material:
Syenitic pegmatite
Empirical Formula:
(Na0.99Sr0.03K0.011.03Ca2.01Be2.99Si3.98O13(OH) · 2H2O

Relationship of Alflarsenite to other Species

Member of:
Other Members of Group:
AmiciteK2Na2Al4Si4O16 · 5H2O
Ammonioleucite(NH4,K)(AlSi2O6)
AnalcimeNa(AlSi2O6) · H2O
Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O
BikitaiteLiAlSi2O6 · H2O
BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2O
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O
Chabazite-Levyne SubgroupA subgroup of the Zeolite Group.
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
ClinoptiloliteNote on the distinguishing differences between clinoptilolite and heulandite (hhttp://rruff.
CowlesiteCaAl2Si3O10 · 6H2O
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Dachiardite-KK4(Si20Al4O48)·13H2O
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2O
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2O
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2O
ErioniteThis name now refers to a group of related minerals.
Faujasite SubgroupA subgroup of the Zeolite Group.
FerrieriteZeolite Group.
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2O
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2O
Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
GaultiteNa4Zn2Si7O18 · 5H2O
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2O
GmeliniteIn 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
GobbinsiteNa5(Si11Al5)O32 · 11H2O
GoosecreekiteCa[Al2Si6O16] · 5H2O
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2O
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
HeulanditeNote on the distinguishing differences between heulandite and clinoptilolite (http://rruff.
HsianghualiteCa3Li2(Be3Si3O12)F2
KirchhoffiteCs(BSi2O6)
LaumontiteCaAl2Si4O12 · 4H2O
LovdariteK2Na6Be4Si14O36 · 9H2O
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2O
Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
Mazzite-NaNa8[Al4Si14O36]2 · 30H2O
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O
Montesommaite(K,Na)9Al9Si23O64 · 10H2O
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
MutinaiteNa3Ca4Si85Al11O192 · 60H2O
NabesiteNa2BeSi4O10 · 4H2O
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2O
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
Paulingite-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2O
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
PhillipsiteZeolite Group.
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
StelleriteCa4(Si28Al8)O72 · 28H2O
Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Stilbite-Na(Na,Ca,K)6-7[Al8Si28O72] · nH2O
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2O
Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2O
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2O
WairakiteCa(Al2Si4O12) · 2H2O
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2O
Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2O
WillhendersoniteKCa[Al3Si3O12] · 5H2O
YugawaraliteCaAl2Si6O16 · 4H2O
9.00.Clino-ferri-holmquistite◻{Li2}{Mg3Fe23+}(Si8O22)(OH)2
9.00.Shkatulkalita
9.00.YegoroviteNa4[Si4O8(OH)4] · 7H2O
9.00.FerroericssoniteBaFe22+ Fe3+(Si2O7)O(OH)
9.00.Ferrisepiolite(Fe3+,Fe2+,Mg)4((Si,Fe3+)6O15)(O,OH)2 · 6H2O
9.00.ZvyaginiteNaZnNb2Ti[Si2O7]20(OH,F)3(H2O)4 + (x < 1)
9.00.BurnettiteCaVAlSiO6
9.00.MendigiteMn2Mn2MnCa(Si3O9)2
9.00.20Rinkite-(Ce)(Ca3Ce)Na(NaCa)Ti(Si2O7)2(OF)F2

Other Names for Alflarsenite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Alflarsenite

Reference List:
Raade, 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, 893-900.

Grice, J.D., Raade, G., Cooper, M.A. (2010): Alflarsenite: Structure and relationship to other Be-Si and zeolite framework structures. Canadian Mineralogist, 48, 255-266.

Internet Links for Alflarsenite

mindat.org URL:
https://www.mindat.org/min-38701.html
Please feel free to link to this page.

Localities for Alflarsenite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Norway (TL)
 
  • Vestfold
    • Larvik
      • Tvedalen
Raade, 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, 893-900
Mineral and/or Locality  
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