Mineralogy Database

Marianoite Mineral Data

Search Webmineral :

General Marianoite Information

Help on Chemical  Formula: Chemical Formula: Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4
Help on Composition: Composition: Molecular Weight = 792.51 gm
   Sodium      5.60 %  Na    7.55 % Na2O
   Calcium    20.21 %  Ca   28.28 % CaO
   Hafnium     0.14 %  Hf    0.16 % HfO2
   Magnesium   0.09 %  Mg    0.14 % MgO
   Zirconium  10.35 %  Zr   13.98 % ZrO2
   Tantalum    0.07 %  Ta    0.08 % Ta2O5
   Titanium    0.57 %  Ti    0.95 % TiO2
   Manganese   0.29 %  Mn    0.38 % MnO
   Niobium    11.34 %  Nb   16.22 % Nb2O5
   Iron        0.56 %  Fe    0.73 % FeO
   Silicon    14.05 %  Si   30.06 % SiO2
   Oxygen     34.17 %  O
   Fluorine    2.57 %  F     2.57 % F
                -   %   F    -1.08 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.93Ca3.99Mn2+0.04Nb0.96Zr0.89Ti0.09Fe2+0.08Mg0.02Hf0.006Ta0.003Si3.96O14O2.92F1.07
Help on Environment: Environment: Discovered in rock which consists of phlogopite, U-rich pyrochlore, titanite, and marianoite (which makes up approximately 1 vol% of the rock). Cuspidine group
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Prairie Lake, Thunder bay district, Ontario, Canada Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Anthony ("Tony") Nicola Mariano (b. 1930) in recognition for his contributions to the study of alkaline rocks and carbonatites.
Help on Synonym: Synonym: IMA2005-005a

Marianoite Image

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


Comments: PPL image of euhedral crystals of marianoite, titanite and U-rich pyrochlore in the phlogopite-calcite silicocarbonatite. (CanMin, v46:1023).
Location: Mesoproterozoic Prairie Lake intrusive complex, in northwestern Ontario, Canada. Scale: See Image.
© Canadian Mineralogist

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


Comments: SEM images showing the morphology of marianoite crystals, (CanMin, v46:1023).
Location: Mesoproterozoic Prairie Lake intrusive complex, in northwestern Ontario, Canada. Scale: See Images.
© Canadian Mineralogist

Marianoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0605:1:0.7111
Help on Cell Dimensions: Cell Dimensions: a = 10.845, b = 10.226, c = 7.272, Z = 2; beta = 109.33° V = 761.01 Den(Calc)= 3.46
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.02(1), 2.85(1), 3.04(1),2.42(0.75), 2.48(0.75), 3.23(0.75), 3.64(0.75),

Physical Properties of Marianoite

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Pale yellow.
Help on Density: Density: 3.32
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous - Greasy

Optical Properties of Marianoite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2062,KPDmeas= 0.2149,KC= 0.2168
Ncalc = 1.72 - 1.75
Help on Optical Data: Optical Data: Biaxial (-), a=1.7, b=1.715, g=1.725, bire=0.0250, 2V(Calc)=76, 2V(Meas)=80. Dispersion weak, r < v.

Calculated Properties of Marianoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Marianoite =3.32 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMarianoite = 35.94 barns/electron
U=PEMarianoite x rElectron Density= 115.48 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Marianoite is Not Radioactive

Marianoite Classification

Help on  Dana Class: Dana Class: (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.04)Cuspidine - Wohlerite group Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m Burpalite Na2CaZrSi2O7F2 P 21/a 2/m Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m Jennite Ca9Si6O18(OH)6•8H2O P1 1 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho Natrokomarovite* Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m
Help on  Strunz Class: Strunz Class: 09.BE.17 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
09.BE.17 Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m
09.BE.17 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m
09.BE.17 Burpalite Na2CaZrSi2O7F2 P 21/a 2/m
09.BE.17 Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m
09.BE.17 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
09.BE.17 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m
09.BE.17 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
09.BE.17 Normandite! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 21/a 2/m
09.BE.17 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m
09.BE.17 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m

Other Marianoite Information

Help on References: References: NAME( CanMin, v46:1023) PHYS. PROP.(CanMin, v46:1023) OPTIC PROP.(CanMin, v46:1023)
Help on See Also: See Also: Links to other databases for Marianoite :
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 Marianoite using:

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

Visit our Advertisers for Marianoite :

Ask about Marianoite 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 Espa´┐Żol

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


Dana No: Strunz No: 09.BE.17





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