Mineralogy Database

Tranquillityite Mineral Data

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General Tranquillityite Information

Help on Chemical  Formula: Chemical Formula: Fe++8(Zr,Y)2Ti3Si3O24
Help on Composition: Composition: Molecular Weight = 1,239.95 gm
   Yttrium     3.59 %  Y     4.55 % Y2O3
   Zirconium  11.04 %  Zr   14.91 % ZrO2
   Titanium   11.58 %  Ti   19.33 % TiO2
   Iron       36.03 %  Fe   46.35 % FeO
   Silicon     6.80 %  Si   14.54 % SiO2
   Oxygen     30.97 %  O
             ______        ______ 
             100.00 %       99.68 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+8Zr1.5Y0.5Ti3Si3O24
Help on Environment: Environment: In mare and non-mare basalts on the Moon.
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: Tranquility Base, Moon (Apollo 11). Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tranquillityite + Pronunciation Say TRANQUILLITYITE

Tranquillityite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.90333
Help on Cell Dimensions: Cell Dimensions: a = 11.69, c = 22.25, Z = 6; V = 2,633.24 Den(Calc)= 4.69
Help on Crystal System: Crystal System: Hexagonal Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.23(1), 1.781(0.7), 2.155(0.6),

Physical Properties of Tranquillityite

Help on Color: Color: Dark red.
Help on Density: Density: 4.7
Help on Diaphaneity: Diaphaneity: Subopaque
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Habit: Habit: Thin - Flat dimensioned crystals.
Help on Luster: Luster: Sub Metallic

Optical Properties of Tranquillityite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2388,KPDmeas= 0.2383,KC= 0.2325
Ncalc = 2.09
Help on Optical Data: Optical Data: Biaxial (?), a=2.12, 2V(Meas)=40.

Calculated Properties of Tranquillityite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.45 gm/cc
note: Specific Gravity of Tranquillityite =4.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PETranquillityite = 32.66 barns/electron
U=PETranquillityite x rElectron Density= 145.47 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tranquillityite is Not Radioactive

Tranquillityite Classification

Help on  Dana Class: Dana Class: (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.16)Dana Group Tranquillityite Fe8(Zr,Y)2Ti3Si3O24 Unk Hex
Help on  Strunz Class: Strunz Class: 09.AG.90 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AG -Nesosilicates with additional anions; cations in > [6] � [6] coordination
09.AG.90 Tranquillityite Fe8(Zr,Y)2Ti3Si3O24 Unk Hex

Other Tranquillityite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Tranquillityite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.AG.90





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