Tranquillityite Mineral Data

General Tranquillityite Information

Chemical Formula:

Fe++8(Zr,Y)2Ti3Si3O24

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

Empirical Formula:

Fe²⁺₈Zr_1.5Y_0.5Ti₃Si₃O₂₄

Environment:

In mare and non-mare basalts on the Moon.

IMA Status:

Approved IMA 1971

Locality:

Tranquility Base, Moon (Apollo 11). Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Tranquillityite + Pronunciation

Tranquillityite Crystallography

Axial Ratios:

a:c = 1:1.90333

Cell Dimensions:

a = 11.69, c = 22.25, Z = 6; V = 2,633.24 Den(Calc)= 4.69

Crystal System:

Hexagonal Space Group: Unk

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

By Intensity(I/I_o): 3.23(1), 1.781(0.7), 2.155(0.6),

Physical Properties of Tranquillityite

Color:

Dark red.

Density:

4.7

Diaphaneity:

Subopaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Habit:

Thin - Flat dimensioned crystals.

Luster:

Sub Metallic

Optical Properties of Tranquillityite

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

Optical Data:

Biaxial (?), a=2.12, 2V(Meas)=40.

Calculated Properties of Tranquillityite

Electron Density:

Bulk Density (Electron Density)=4.45 gm/cc
note: Specific Gravity of Tranquillityite =4.70 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Tranquillityite}= 32.66 barns/electron
U=PE_{Tranquillityite} x rElectron Density= 145.47 barns/cc.

Radioactivity:

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

Tranquillityite Classification

Dana Class:

78.07.16.01 (78)Unclassified silicates

(78.07)wholly unclassified silicates

(78.07.16)Dana Group

78.07.16.01 Tranquillityite Fe8(Zr,Y)2Ti3Si3O24 Unk Hex

Strunz Class:

09.AG.90 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AG -Nesosilicates with additional anions; cations in > [6] ï¿½ [6] coordination

09.AG.90 Tranquillityite Fe8(Zr,Y)2Ti3Si3O24 Unk Hex

Other Tranquillityite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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

Tranquillityite

Fe++8(Zr,Y)2Ti3Si3O24
Dana No: 78.07.16.01 Strunz No: 09.AG.90
Locality:

Notes:

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