Mineralogy Database

Dachiardite-Ca Mineral Data

Search Webmineral :

General Dachiardite-Ca Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na2,K2)5Al10Si38O96•25(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca1.54K0.92Na0.42Cs0.11Sr0.12Ba0.01Al4.86Fe3+0.02Si18.96O48�12.56(H2O)
Help on Environment: 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 .
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1906
Help on Locality: Locality: Filone della Speranza, Monte Capanne, San Piero di Campo, island of Elba, Tuscany, Italy.. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Antonio D'Achiardi (1839-1902), Professor of Mineralogy, Universit� di Pisa, Italy, who first described the mineral discovered by his son in a granitic pegmatite.
Help on Name Pronunciation: Name Pronunciation: Dachiardite-Ca + Pronunciation Say DACHIARDITE-CA
Help on Synonym: Synonym: Achiardite
  Svetlozarite - twinned

Dachiardite-Ca Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: Milky bladed aggregates of dachiardite-Ca with mordenite-Na in cavities in basalt.
Location: Cape Lookout Quarry, Tillamook Co., Oregon, USA. Scale: Specimen Size 2.5x4 cm.
© Diederik Visser

Dachiardite-Ca Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.4856:1:1.3695
Help on Cell Dimensions: Cell Dimensions: a = 18.64, b = 7.499, c = 10.27, Z = 1; beta = 107.75° V = 1,367.22 Den(Calc)= 2.18
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): 3.204(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

Help on Cleavage: Cleavage: {100} Perfect, {001} Perfect
Help on Color: Color: White, Pink, Orange red.
Help on Density: Density: 2.14 - 2.21, Average = 2.17
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Pseudo Octohedral - Crystals show an octohedral outline.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white

Optical Properties of Dachiardite-Ca

Help on Gladstone-Dale: 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
Ncalc = 1.48 - 1.49
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.20 gm/cc
note: Specific Gravity of Dachiardite-Ca =2.18 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEDachiardite-Ca = 6.04 barns/electron
U=PEDachiardite-Ca x relectron= 13.26 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 29.16 (Gamma Ray American Petroleum Institute Units)
Concentration of Dachiardite-Ca per GRapi unit = 3.43 (%)

Estimated Radioactivity from Dachiardite-Ca - barely detectable


Dachiardite-Ca 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-Ca Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Dachiardite-Ca :
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

Search for Dachiardite-Ca using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Dachiardite-Ca :

Ask about Dachiardite-Ca here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaol

Print or Cut-and-Paste your Dachiardite-Ca Specimen Label here :


Dana No: Strunz No: 09.GD.40





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.