Marianoite Mineral Data

General Marianoite Information

Chemical Formula:

Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4

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

Empirical Formula:

Na_1.93Ca_3.99Mn²⁺_0.04Nb_0.96Zr_0.89Ti_0.09Fe²⁺_0.08Mg_0.02Hf_0.006Ta_0.003Si_3.96O₁₄O_2.92F_1.07

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

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Prairie Lake, Thunder bay district, Ontario, Canada Link to MinDat.org Location Data.

Name Origin:

Named for Anthony ("Tony") Nicola Mariano (b. 1930) in recognition for his contributions to the study of alkaline rocks and carbonatites.

Synonym:

IMA2005-005a

Marianoite Image

Images:

Marianoite

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

Images:

Marianoite

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

Axial Ratios:

a:b:c =1.0605:1:0.7111

Cell Dimensions:

a = 10.845, b = 10.226, c = 7.272, Z = 2; beta = 109.33° V = 761.01 Den(Calc)= 3.46

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁

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

By Intensity(I/I_o): 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

Cleavage:

{010} Distinct

Color:

Pale yellow.

Density:

3.32

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6 - Orthoclase

Luster:

Vitreous - Greasy

Optical Properties of Marianoite

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

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

Electron Density:

Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Marianoite =3.32 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Marianoite= 35.94 barns/electron
U=PE_Marianoite x rElectron Density= 115.48 barns/cc.

Radioactivity:

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

Marianoite Classification

Dana Class:

56.02.04.18 (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

56.02.04.01 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

56.02.04.02 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

56.02.04.03 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

56.02.04.04 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

56.02.04.05 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

56.02.04.06 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

56.02.04.07 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

56.02.04.08 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1

56.02.04.09 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

56.02.04.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

56.02.04.11 Jennite Ca9Si6O18(OH)6•8H2O P1 1

56.02.04.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho

56.02.04.13 Natrokomarovite* Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m

56.02.04.14 Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2

56.02.04.15 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra

56.02.04.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1

56.02.04.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

56.02.04.18 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 2₁ 2/m

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

References:

NAME( CanMin, v46:1023) PHYS. PROP.(CanMin, v46:1023) OPTIC PROP.(CanMin, v46:1023)

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:

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

Visit our Advertisers for Marianoite :

A Bijoux Google Search for Marianoite
Adam's Minerals Google Search for Marianoite
Cape Minerals Google Search for Marianoite
Dakota Matrix Minerals Google Search for Marianoite
Excalibur Mineral Corp. Google Search for Marianoite
Exceptional Minerals Google Search for Marianoite
John Betts Fine Minerals Search for Marianoite
McDougall Minerals Google Search for Marianoite
Mineral News Website Link
Rock and Mineral Shows Google Search for Marianoite
Weinrich Minerals, Inc. Google Search 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 Español

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

Marianoite

Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4
Dana No: 56.02.04.18 Strunz No: 09.BE.17
Locality:

Notes: