Lutecite Mineral Data

General Lutecite Information

Chemical Formula:

SiO2

Composition:

Molecular Weight = 60.08 gm

Silicon 46.74 % Si 100.00 % SiO₂

Oxygen 53.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(SiO₂)

Environment:

Precipitated from silica saturated solutions at high pH. Compare with chalcedony. Indistinguishable from the former.

IMA Status:

Not Approved IMA

Locality:

Gran Canaria, Canary Islands. Occures world wide. Link to MinDat.org Location Data.

Name Origin:

Named in 1892.

Synonym:

Lutecine

Moganite

Lutecite Crystallography

Axial Ratios:

a:b:c =1.7961:1:2.1974

Cell Dimensions:

a = 8.758, b = 4.876, c = 10.715, Z = 12; beta = 90.09° V = 457.57 Den(Calc)= 2.62

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I12/a1=C 2/c

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

By Intensity(I/I_o): 3.39(0.5), 1.37(1), 1.38(1),1.83(1), 2.29(1), 3.33(1), 4.45(1),

Physical Properties of Lutecite

Cleavage:

None

Color:

Gray, Chalky white.

Density:

2.52 - 2.58, Average = 2.54

Diaphaneity:

Translucent

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Colloform - Forming from a gel or colloidal mass.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Lutecite

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2013,KPDmeas= 0.2069,KC= 0.208
Ncalc = 1.52 - 1.54

Optical Data:

Biaxial (?), a=1.524, g=1.531, bire=0.0070

Calculated Properties of Lutecite

Electron Density:

Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Lutecite =2.55 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Lutecite= 1.80 barns/electron
U=PE_Lutecite x rElectron Density= 4.58 barns/cc.

Radioactivity:

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

Lutecite Classification

Dana Class:

75.02.03.01 (75)Tectosilicate Si Tetrahedral Frameworks

(75.02)SiO2 with H2O and organics

(75.02.03)Dana Group

75.02.03.01 Lutecite* SiO2 I12/a1=C 2/c 2/m

Strunz Class:

04.DA.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DA -With small cations

04.DA.20 Lutecite* SiO2 I12/a1=C 2/c 2/m

04.DA.20 Moganite! SiO2 I2/a 2/m

Other Lutecite Information

References:

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

See Also:

Links to other databases for Lutecite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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

Lutecite

SiO2
Dana No: 75.02.03.01 Strunz No: 04.DA.20
Locality:

Notes:

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