Carlosturanite Mineral Data

General Carlosturanite Information

Chemical Formula:

(Mg,Fe++,Ti,Mn)21(Si,Al)12O28(OH)34

Composition:

Molecular Weight = 1,757.93 gm

Magnesium 26.13 % Mg 43.33 % MgO

Titanium 1.91 % Ti 3.18 % TiO₂

Manganese 0.63 % Mn 0.81 % MnO

Aluminum 0.77 % Al 1.45 % Al₂O₃

Iron 3.49 % Fe 4.50 % FeO

Silicon 18.37 % Si 39.31 % SiO₂

Hydrogen 1.38 % H 12.30 % H₂O

Oxygen 47.33 % O

______ ______

100.00 % 104.87 % = TOTAL OXIDE

Empirical Formula:

Mg_18.9Fe²⁺_1.1Ti_0.7Mn²⁺_0.2Si_11.5Al_0.5O₂₈(OH)₂₄

Environment:

In a network of veins crosscutting a metamorphic antigorite serpentinite, in an ophiolite.

IMA Status:

Approved IMA 1985

Locality:

In Italy, at a number of localities around Sampeyre and Calsteldelfino, Varaita Valley. Link to MinDat.org Location Data.

Name Origin:

Named for Prof. Carlo Sturani (1938-1976), University of Torino, Torino, Italy.

Carlosturanite Image

Images:

Carlosturanite

Comments: White to tan fibrous coatings of carlosturanite on matrix.
Location: Val Varaita, Cuneo, Piemonte, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Carlosturanite Crystallography

Axial Ratios:

a:b:c =3.9001:1:0.7748

Cell Dimensions:

a = 36.7, b = 9.41, c = 7.291, Z = 2; beta = 101.1° V = 2,470.82 Den(Calc)= 2.36

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Cm

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

By Intensity(I/I_o): 7.17(1), 3.397(0.55), 3.595(0.45),2.562(0.4), 2.28(0.35), 18.02(0.25), 3.637(0.2),

Physical Properties of Carlosturanite

Cleavage:

{001} Perfect, {010} Parting

Color:

Light brown.

Density:

2.63

Diaphaneity:

Transparent

Fracture:

Flexible - Flexible fragments.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Carlosturanite

Gladstone-Dale:

CI meas= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2564,KPDmeas= 0.23,KC= 0.2358
Ncalc = 1.56 - 1.62

Optical Data:

Biaxial (?), b=1.605

Pleochroism (x):

brown orange.

Pleochroism (y):

brown orange.

Pleochroism (z):

pale brown orange.

Calculated Properties of Carlosturanite

Electron Density:

Bulk Density (Electron Density)=2.64 gm/cc
note: Specific Gravity of Carlosturanite =2.63 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Carlosturanite}= 2.78 barns/electron
U=PE_{Carlosturanite} x rElectron Density= 7.36 barns/cc.

Radioactivity:

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

Carlosturanite Classification

Dana Class:

67.01.02.01 (67)Inosilicate Unbranched Chains with W>2

(67.01)with W=3

(67.01.02)Dana Group

67.01.02.01 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m

Strunz Class:

09.DJ.25 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DJ -Inosilicates with 4-periodic double and triple chains

09.DJ.25 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m

Other Carlosturanite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Carlosturanite :
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 Carlosturanite Specimen Label here :

Carlosturanite

(Mg,Fe++,Ti,Mn)21(Si,Al)12O28(OH)34
Dana No: 67.01.02.01 Strunz No: 09.DJ.25
Locality:

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