Dellaite Mineral Data

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.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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)

Search for Dellaite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Dellaite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Dellaite Mineral Data :

Ask about Dellaite 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 Español

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: