Dachiardite-Na Mineral Data

Dachiardite-Na Mineral Data +

General Dachiardite-Na Information

Chemical Formula:

(Na2,Ca,K2)4Al4Si20O48·13(H2O)

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

Empirical Formula:

Na_2.59Ca_0.53K_0.71Mg_0.04Ba_0.01Al_4.86Fe³⁺_0.11Si_19.61O₄₈·13.43(H₂O)

Environment:

Secondary mineral hydrothermally altered from calc-alkalic to alkalic volcanic and plutonic rocks.

IMA Status:

Approved IMA 1977

Locality:

From La Pallaccia and Orli di Fassa, Alpe di Siusi, Trentoin-Alto Adige, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for its relationship to dachiardite and the sodium content.

Synonym:

Achiardite

Sodiumdachiardite - renamed Dachiardite-Na

Svetlozarite - twinned

Dachiardite-Na Image

Images:

Dachiardite-Na

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

Dachiardite-Na Crystallography

Axial Ratios:

a:b:c =2.4842:1:1.3717

Cell Dimensions:

a = 18.647, b = 7.506, c = 10.296, Z = 1; beta = 108.37° V = 1,367.64 Den(Calc)= 2.20

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

[1] Perfect, [1] Perfect

Color:

Colorless, White, Reddish orange.

Density:

2.16

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Divergent - Crystals radiate from a center without producing stellar forms.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Dachiardite-Na

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

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

Electron Density:

r_electron=2.18 gm/cc
note: r_{Dachiardite-Na}=2.16 gm/cc.

Fermion Index

Fermion Index = 0.01476
Boson Index = 0.98524

Photoelectric:

PE_{Dachiardite-Na}= 2.15 barns/electron
U=PE_{Dachiardite-Na} x r_electron= 4.70 barns/cc.

Radioactivity:

GRapi = 22.34 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Dachiardite-Na - barely detectable

Dachiardite-Na Classification

Dana Class:

77.1.6.5 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.6)Mordenite and related species

77.1.6.1 Mordenite (Ca,Na2,K2)Al2Si10O24·7(H2O) C mc2₁ mm2

77.1.6.2 Epistilbite CaAl2Si6O16·5(H2O) C1 1

77.1.6.3 Maricopaite Pb7Ca2(Si,Al)48O100·32(H2O) Cm2m 2/m 2/m 2/m

77.1.6.4 Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96·25(H2O) C 2/m 2/m

77.1.6.5 Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48·13(H2O) C 2/m 2/m

77.1.6.6 Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36·9(H2O) Pnnm 2/m 2/m 2/m

77.1.6.6a Ferrierite-K! (K,Na)2Mg(Si,Al)18O36·9(H2O) Pnnm 2/m 2/m 2/m

77.1.6.6b Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36·9(H2O) P 2₁/n 2/m 2/m 2/m

77.1.6.7 Boggsite NaCa2(Al5Si19O48)·17(H2O) I mma 2/m 2/m 2/m

77.1.6.8 Gottardiite! Na3Mg3Ca5Al19Si117O272·93(H2O) C mca 2/m 2/m 2/m

77.1.6.9 Terranovaite! (Na,Ca)8(Si68Al12)O160-29(H2O) C mcm 2/m 2/m 2/m

77.1.6.10 Mutinaite! Na3Ca4Si85Al11O192·60(H2O) P nma 2/m 2/m 2/m

Strunz Class:

VIII/J.22-15 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.22 - Zeolite group, Ferrierite - Laumontite series

VIII/J.22-01 Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36·9(H2O) P 2₁/n 2/m 2/m 2/m

VIII/J.22-03 Ferrierite-K! (K,Na)2Mg(Si,Al)18O36·9(H2O) Pnnm 2/m 2/m 2/m

VIII/J.22-05 Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36·9(H2O) Pnnm 2/m 2/m 2/m

VIII/J.22-06 Mutinaite! Na3Ca4Si85Al11O192·60(H2O) P nma 2/m 2/m 2/m

VIII/J.22-07 Terranovaite! (Na,Ca)8(Si68Al12)O160-29(H2O) C mcm 2/m 2/m 2/m

VIII/J.22-08 Gottardiite! Na3Mg3Ca5Al19Si117O272·93(H2O) C mca 2/m 2/m 2/m

VIII/J.22-10 Boggsite NaCa2(Al5Si19O48)·17(H2O) I mma 2/m 2/m 2/m

VIII/J.22-15 Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48·13(H2O) C 2/m 2/m

VIII/J.22-20 Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96·25(H2O) C 2/m 2/m

VIII/J.22-30 Mordenite (Ca,Na2,K2)Al2Si10O24·7(H2O) C mc2₁ mm2

VIII/J.22-40 Edingtonite BaAl2Si3O10·4(H2O) P 2₁2₁2 2 2 2

VIII/J.22-50 Laumontite CaAl2Si4O12·4(H2O) C 2/m 2/m

Other Dachiardite-Na Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2, CanMin, v 35, p 1580) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Dachiardite-Na :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Dachiardite-Na

(Na2,Ca,K2)4Al4Si20O48·13(H2O)
Dana No: 77.1.6.5 Strunz No: VIII/J.22-15
Locality:

Notes: