Dellaite Mineral Data

General Dellaite Information

Chemical Formula:

Ca6Si3O11(OH)2

Composition:

Molecular Weight = 534.73 gm

Calcium 44.97 % Ca 62.92 % CaO

Silicon 15.76 % Si 33.71 % SiO₂

Hydrogen 0.38 % H 3.37 % H₂O

Oxygen 38.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₆Si₃O₁₁(OH)₂

Environment:

Late-stage veins cutting a metamorphic assemblage.

IMA Status:

Approved IMA 1965

Locality:

Kilchoan, Ardnamurcan, Scotland. Link to MinDat.org Location Data.

Name Origin:

Named for Della Martin Roy (1926-), Pennsylvania State University geochemist who first synthesized this phase.

Name Pronunciation:

Dellaite

Synonym:

ICSD 20148

PDF 29-376

Dellaite Image

Images:

Dellaite Rustumite

Comments: White grains of dellaite, intermixed with rustumite.
Location: Queretaro, Zacatecas, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dellaite Crystallography

Axial Ratios:

a:b:c =0.9828:1:1.8578

Cell Dimensions:

a = 6.815, b = 6.934, c = 12.882, Z = 2; alpha = 90.67°, beta = 97.7°, gamma = 98.14° V = 597.13 Den(Calc)= 2.97

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.821(1), 2.551(0.8), 2.806(0.7),

Physical Properties of Dellaite

Color:

Colorless.

Density:

2.94

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Dellaite

Optical Data:

NCalc= 1.64 - from Gladstone-Dale relationship (KC = 0.2137) where Ncalc=Dcalc*KC+1
NCalc= 1.63 - from Gladstone-Dale relationship (KC = 0.2137) where Ncalc=Dmeas*KC+1

Calculated Properties of Dellaite

Electron Density:

Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Dellaite =2.98 gm/cc.

Fermion Index:

Fermion Index = 0.0081527649
Boson Index = 0.9918472351

Photoelectric:

PE_Dellaite= 6.10 barns/electron
U=PE_Dellaite x rElectron Density= 18.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dellaite is Not Radioactive

Dellaite Classification

Dana Class:

78.01.04.01 (78)Unclassified silicates

(78.01)possible nesosilicates

(78.01.04)Dana Group

78.01.04.01 Dellaite Ca6Si3O11(OH)2 P1 1

Strunz Class:

09.BG.45 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;

09.BG.45 Dellaite Ca6Si3O11(OH)2 P1 1

Other Dellaite Information

References:

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

See Also:

Links to other databases for Dellaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Dellaite Specimen Label here :

Dellaite

Ca6Si3O11(OH)2
Dana No: 78.01.04.01 Strunz No: 09.BG.45
Locality:

Notes:

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