Dellaite Mineral Data

Dellaite Mineral Data +

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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.

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 - PinacoidalH-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),

Crystal Structure:

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Ganiev R M , Ilyukhin V V , Belov N V , Doklady Akademii Nauk SSSR , 190 (1970) p.831-834, Crystal structure of cement phase Y=Ca6[Si2O7][SiO4](OH)2, Locality: synthetic

Physical Properties of Dellaite

Color:

Colorless.

Density:

2.94

Diaphaniety:

Transparent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Dellaite

Optical Data:

NCalc= 1.63 - 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:

r_electron=2.98 gm/cc
note: r_Dellaite=2.97 gm/cc.

Fermion Index

Fermion Index = 0.00815
Boson Index = 0.99185

Photoelectric:

PE_Dellaite= 6.10 barns/electron
U=PE_Dellaite x r_electron= 18.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Dellaite is Not Radioactive

Dellaite Classification

Dana Class:

78.1.4.1 (78)Unclassified silicates

(78.1)possible nesosilicates

(78.1.4)Dana Group

78.1.4.1 Dellaite Ca6Si3O11(OH)2 P1 1

Strunz Class:

VIII/C.22-10 VIII - Silicates

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.22 - Dellaite - Rustumite series

VIII/C.22-10 Dellaite Ca6Si3O11(OH)2 P1 1

VIII/C.22-20 Rustumite Ca10(Si2O7)2(SiO4)Cl2(OH)2 C 2/c 2/m

Other Dellaite Information

References:

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

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

Dellaite

Ca6Si3O11(OH)2
Dana No: 78.1.4.1 Strunz No: VIII/C.22-10
Locality:

Notes: