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 % Na2 O
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 % Ta2 O5
Titanium 0.57 % Ti 0.95 % TiO2
Manganese 0.29 % Mn 0.38 % MnO
Niobium 11.34 % Nb 16.22 % Nb2 O5
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:
Na1.93 Ca3.99 Mn2+ 0.04 Nb0.96 Zr0.89 Ti0.09 Fe2+ 0.08 Mg0.02 Hf0.006 Ta0.003 Si3.96 O14 O2.92 F1.07
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 - Prismatic H-M Symbol (2/m) Space Group: P 21
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
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:
PEMarianoite = 35.94 barns/electronU=PEMarianoite x r Electron 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
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Marianoite
Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4
Dana No: 56.02.04.18 Strunz No: 09.BE.17
Locality:
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