Mineralogy Database

Dachiardite-Na Mineral Data

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General Dachiardite-Na Information

Help on Chemical  Formula: Chemical Formula: (Na2,Ca,K2)4Al4Si20O48•13(H2O)
Help on Composition: Composition: Molecular Weight = 1,808.84 gm
   Potassium   1.53 %  K     1.85 % K2O
   Barium      0.08 %  Ba    0.08 % BaO
   Sodium      3.29 %  Na    4.44 % Na2O
   Calcium     1.17 %  Ca    1.64 % CaO
   Magnesium   0.05 %  Mg    0.09 % MgO
   Aluminum    7.25 %  Al   13.70 % Al2O3
   Iron        0.34 %  Fe    0.49 % Fe2O3
   Silicon    30.45 %  Si   65.14 % SiO2
   Hydrogen    1.50 %  H    13.38 % H2O
   Oxygen     54.34 %  O
             ______        ______ 
             100.00 %      100.80 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2.59Ca0.53K0.71Mg0.04Ba0.01Al4.86Fe3+0.11Si19.61O48�13.43(H2O)
Help on Environment: Environment: Secondary mineral hydrothermally altered from calc-alkalic to alkalic volcanic and plutonic rocks.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: From La Pallaccia and Orli di Fassa, Alpe di Siusi, Trentoin-Alto Adige, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its relationship to dachiardite and the sodium content.
Help on Name Pronunciation: Name Pronunciation: Dachiardite-Na + Pronunciation Say DACHIARDITE-NA
Help on Synonym: Synonym: Achiardite
  Sodiumdachiardite - renamed Dachiardite-Na
  Svetlozarite - twinned

Dachiardite-Na Image

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Comments: Orange flat radial crystals of dachiardite-Na to 2cm across on matrix.
Location: Alpe di Siusi, Bolzano, Trentino Alto Adige, Italy. Scale: Specimen size: 6x4x3cm.
© Tom Loomis / Dakota Matrix

Dachiardite-Na Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.4842:1:1.3717
Help on Cell Dimensions: Cell Dimensions: a = 18.647, b = 7.506, c = 10.296, Z = 1; beta = 108.37° V = 1,367.64 Den(Calc)= 2.20
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.45(1), 8.88(0.8), 6.92(0.8),3.75(0.7), 4.86(0.6), 3.38(0.6), 3.2(0.6),

Physical Properties of Dachiardite-Na

Help on Cleavage: Cleavage: {1} Perfect, {1} Perfect
Help on Color: Color: Colorless, White, Reddish orange.
Help on Density: Density: 2.16
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Divergent - Crystals radiate from a center without producing stellar forms.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Dachiardite-Na

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2173,KPDmeas= 0.2213,KC= 0.2266
Ncalc = 1.49 - 1.5
Help on Optical Data: Optical Data: Biaxial (-), a=1.471-1.48, b=1.475-1.481, g=1.476-1.485, bire=0.0050, 2V(Calc)=52-54, 2V(Meas)=52-92. Dispersion r < v moderate.

Calculated Properties of Dachiardite-Na

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.18 gm/cc
note: Specific Gravity of Dachiardite-Na =2.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEDachiardite-Na = 2.15 barns/electron
U=PEDachiardite-Na x relectron= 4.70 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 22.34 (Gamma Ray American Petroleum Institute Units)
Concentration of Dachiardite-Na per GRapi unit = 4.48 (%)

Estimated Radioactivity from Dachiardite-Na - barely detectable


Dachiardite-Na Classification

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.06)Mordenite and related species Mordenite (Ca,Na2,K2)Al2Si10O24•7(H2O) C mc21 mm2 Epistilbite CaAl2Si6O16•5(H2O) C1 1 Maricopaite Pb7Ca2(Si,Al)48O100•32(H2O) Cm2m 2/m 2/m 2/m Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96•25(H2O) C 2/m 2/m Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48•13(H2O) C 2/m 2/m Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m Ferrierite-K! (K,Na)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36•9(H2O) P 21/n 2/m Boggsite NaCa2(Al5Si19O48)•17(H2O) I mma 2/m 2/m 2/m Gottardiite! Na3Mg3Ca5Al19Si117O272•93(H2O) C mca 2/m 2/m 2/m Terranovaite! (Na,Ca)8(Si68Al12)O160•29(H2O) C mcm 2/m 2/m 2/m Mutinaite! Na3Ca4Si85Al11O192•60(H2O) P nma 2/m 2/m 2/m Direnzoite! NaK6MgCa2(Al13Si47O120)•36H2O Pmmn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.GD.40 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GD -Chains of 6-membered rings � tabular zeolites
09.GD.40 Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96•25(H2O) C 2/m 2/m
09.GD.40 Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48•13(H2O) C 2/m 2/m

Other Dachiardite-Na Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2, CanMin, v 35, p 1580) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Dachiardite-Na :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.GD.40





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