Carlosturanite
A valid IMA mineral species
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About Carlosturanite
Carlo Sturani
Formula:
(Mg,Fe,Ti)21(Si,Al)12O28(OH)34 · H2O
Colour:
Light brown
Lustre:
Vitreous, Pearly
Hardness:
2½
Specific Gravity:
2.63
Crystal System:
Monoclinic
Name:
Named in honor of Carlo Sturani (1938 - 20 December 1976, Alba, Italy), Professor of Geology at the University of Torino, Torino, Italy.
Type Locality:
Unique Identifiers
Mindat ID:
903
Long-form identifier:
mindat:1:1:903:4
IMA Classification of Carlosturanite
Approved
IMA Formula:
(Mg,Fe2+,Ti4+)21(Si,Al)12O28(OH)34·H2O
Approval year:
1984
First published:
1985
Approval history:
IMA1984-009
Classification of Carlosturanite
9.DJ.25
9 : SILICATES (Germanates)
D : Inosilicates
J : Inosilicates with 4-periodic double and triple chains
9 : SILICATES (Germanates)
D : Inosilicates
J : Inosilicates with 4-periodic double and triple chains
67.1.2.1
67 : INOSILICATES Unbranched Chains with W > 2
1 : Unbranched Chains with W>2 with W=3
67 : INOSILICATES Unbranched Chains with W > 2
1 : Unbranched Chains with W>2 with W=3
16.14.11
16 : Silicates Containing Aluminum and other Metals
14 : Aluminosilicates of Ti, Zr, Sn and Pb
16 : Silicates Containing Aluminum and other Metals
14 : Aluminosilicates of Ti, Zr, Sn and Pb
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Csr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Csr | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Carlosturanite
Vitreous, Pearly
Transparency:
Transparent
Colour:
Light brown
Streak:
Whitish
Hardness:
2½ on Mohs scale
Tenacity:
Flexible
Cleavage:
Very Good
{001}
{001}
Parting:
{010}
Density:
2.63(2) g/cm3 (Measured) 2.606 g/cm3 (Calculated)
Optical Data of Carlosturanite
Type:
Biaxial
Dispersion:
r > v
Pleochroism:
Weak
Comments:
Orange-brown parallel [010]; pale orange-brown perpendicular [010].
Chemistry of Carlosturanite
Mindat Formula:
(Mg,Fe,Ti)21(Si,Al)12O28(OH)34 · H2O
Element Weights:
Common Impurities:
Mn,Cr
Crystallography of Carlosturanite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bm
Setting:
Cm
Cell Parameters:
a = 36.70 Å, b = 9.41 Å, c = 7.29 Å
β = 101.1°
β = 101.1°
Ratio:
a:b:c = 3.9 : 1 : 0.775
Unit Cell V:
2,470.48 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 18.02 Å | (25) |
| 7.17 Å | (100) |
| 3.637 Å | (20) |
| 3.595 Å | (45) |
| 3.397 Å | (55) |
| 2.562 Å | (40) |
| 2.280 Å | (35) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Carlosturanite
Place of Conservation of Type Material:
Regional Science Museum, Torino, Italy.
Natural History Museum, Vienna, Austria, L9493.
National Museum of Natural History, Washington, D.C., USA, 162683.
Natural History Museum, Vienna, Austria, L9493.
National Museum of Natural History, Washington, D.C., USA, 162683.
Geological Setting of Type Material:
veins crosscutting a metamorphic antigorite serpentinite, in an ophiolite.
Associated Minerals at Type Locality:
Synonyms of Carlosturanite
Other Language Names for Carlosturanite
Common Associates
Associations Based on Photo Data:
| 23 photos of Carlosturanite associated with Chrysotile | Mg3(Si2O5)(OH)4 |
| 3 photos of Carlosturanite associated with 'Serpentinite' | |
| 1 photo of Carlosturanite associated with Aragonite | CaCO3 |
| 1 photo of Carlosturanite associated with Artinite | Mg2(CO3)(OH)2 · 3H2O |
Related Minerals - Strunz-mindat Grouping
| 9.DJ.05 | Narsarsukite | Na2(Ti,Fe3+)Si4(O,F)11 |
| 9.DJ.10 | Laplandite-(Ce) | Na4CeTiPO4Si7O18 · 5H2O |
| 9.DJ.15 | Caysichite-(Y) | (Ca,Yb,Er)4Y4(Si8O20)(CO3)6(OH) · 7H2O |
| 9.DJ.20 | Seidite-(Ce) | Na4(Ce,Sr)2[TiSi8O18(OH)2](O,OH,F)4 · 5H2O |
| 9.DJ.30 | Jonesite | Ba4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Carlosturanite
mindat.org URL:
https://www.mindat.org/min-903.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Carlosturanite
Reference List:
Compagnoni, Roberto, Ferraris, Giovanni, Mellini, Marcello (1985) Carlosturanite, a new asbestiform rock-forming silicate from Val Varaita, Italy. American Mineralogist, 70 (7-8) 767-772
Mellini, Marcello, Ferraris, Giovanni, Compagnoni, Roberto (1985) Carlosturanite: HRTEM evidence of a polysomatic series including serpentine. American Mineralogist, 70 (7-8) 773-781
Compagnoni, Roberto, Ferraris, Giovanni, Mellini, Marcello (1985) Carlosturanite, a new asbestiform rock-forming silicate from Val Varaita, Italy. American Mineralogist, 70 (7-8) 767-772
Localities for Carlosturanite
Showing 16 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Compagnoni et al. (1985) +2 other references |
| Belluso et al. (1991) +2 other references | |
| Kolitsch et al. (2003) +1 other reference |
| Belluso et al. (1991) +1 other reference |
| Belluso et al. (1991) +1 other reference | |
| Claus Hedegaard collection +2 other references | |
| Belluso et al. (1991) +1 other reference | |
| Belluso et al. (1991) +1 other reference | |
| Belluso et al. (1991) +1 other reference | |
| Belluso et al. (1991) |
| Belluso et al. (1995) |
| Belluso et al. (1995) |
| Piccoli et al. (2007) |
| Belluso et al. (1995) | |
| Belluso et al. (1995) | |
Sweden | |
| Mellini et al. (1986) |
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Auriol Mine, Casteldelfino, Cuneo Province, Piedmont, Italy