Dachiardite-Ca Mineral Data

Dachiardite-Ca Mineral Data +

General Dachiardite-Ca Information

Chemical Formula:

(Ca,Na2,K2)5Al10Si38O96·25(H2O)

Composition:

Molecular Weight = 1,792.84 gm

Cesium 0.82 % Cs 0.86 % Cs₂O

Potassium 2.01 % K 2.42 % K₂O

Barium 0.08 % Ba 0.09 % BaO

Sodium 0.54 % Na 0.73 % Na₂O

Strontium 0.59 % Sr 0.69 % SrO

Calcium 3.44 % Ca 4.82 % CaO

Aluminum 7.31 % Al 13.82 % Al₂O₃

Iron 0.06 % Fe 0.09 % Fe₂O₃

Silicon 29.70 % Si 63.54 % SiO₂

Hydrogen 1.41 % H 12.62 % H₂O

Oxygen 54.04 % O

______ ______

100.00 % 99.67 % = TOTAL OXIDE

Empirical Formula:

Ca_1.54K_0.92Na_0.42Cs_0.11Sr_0.12Ba_0.01Al_4.86Fe³⁺_0.02Si_18.96O₄₈·12.56(H₂O)

Environment:

Hydrothermal zeolite that generally occurs in silica-rich environments in late states of granitic pegmatites and Si-rich basalts. Ca modifier added by zeolite nomenclatrue committee .

IMA Status:

Valid Species (Pre-IMA) 1906

Locality:

Filone della Speranza, Monte Capanne, San Piero di Campo, island of Elba, Tuscany, Italy.. Link to MinDat.org Location Data.

Name Origin:

Named after Antonio D'Achiardi (1839-1902), Professor of Mineralogy, Universitá di Pisa, Italy, who first described the mineral discovered by his son in a granitic pegmatite.

Synonym:

Achiardite

Dachiardite

Svetlozarite - twinned

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Dachiardite-Ca Crystallography

Axial Ratios:

a:b:c =2.4856:1:1.3695

Cell Dimensions:

a = 18.64, b = 7.499, c = 10.27, Z = 1; beta = 107.75° V = 1,367.22 Den(Calc)= 2.18

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): 3.204(1), 3.542(1), 1.873(0.75),4.88(0.5), 4.97(0.5), 6.91(0.5), 8.9(0.5),

Physical Properties of Dachiardite-Ca

Cleavage:

[100] Perfect, [001] Perfect

Color:

White, Pink, Orange red.

Density:

2.14 - 2.21, Average = 2.17

Diaphaniety:

Transparent to translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Pseudo Octohedral - Crystals show an octohedral outline.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Dachiardite-Ca

Gladstone-Dale:

CI meas= -0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2264,KPDmeas= 0.2269,KC= 0.2223

Optical Data:

Biaxial (+), a=1.488-1.494, b=1.49-1.496, g=1.494-1.499, bire=0.0050-0.0060, 2V(Calc)=72-80, 2V(Meas)=58-73. Dispersion r > v strong.

Calculated Properties of Dachiardite-Ca

Electron Density:

r_electron=2.20 gm/cc
note: r_{Dachiardite-Ca}=2.18 gm/cc.

Fermion Index

Fermion Index = 0.01474
Boson Index = 0.98526

Photoelectric:

PE_{Dachiardite-Ca}= 6.04 barns/electron
U=PE_{Dachiardite-Ca} x r_electron= 13.26 barns/cc.

Radioactivity:

GRapi = 29.16 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Dachiardite-Ca - barely detectable

Dachiardite-Ca Classification

Dana Class:

77.1.6.4 (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.22-20 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-Ca Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Dachiardite-Ca :
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-Ca

(Ca,Na2,K2)5Al10Si38O96·25(H2O)
Dana No: 77.1.6.4 Strunz No: VIII/J.22-20
Locality:

Notes: