Carlosturanite Mineral Data

Carlosturanite Mineral Data

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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 - DomaticH-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

Diaphaniety:

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

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:

r_electron=2.64 gm/cc
note: r_{Carlosturanite}=2.63 gm/cc.

Fermion Index

Fermion Index = 0.03814
Boson Index = 0.96186

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Carlosturanite is Not Radioactive

Carlosturanite Classification

Dana Class:

67.1.2.1 (67)Inosilicate Unbranched Chains with W>2

(67.1)with W=3

(67.1.2)Dana Group

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

Strunz Class:

VIII/H.27-190 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.27 - Serpentine group

VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1

VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono

VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono

VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono

VIII/H.27-190 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Carlosturanite

(Mg,Fe++,Ti,Mn)21(Si,Al)12O28(OH)34
Dana No: 67.1.2.1 Strunz No: VIII/H.27-190
Locality:

Notes: