Mineralogy Database

Tuscanite Mineral Data

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General Tuscanite Information

Help on Chemical  Formula: Chemical Formula: K(Ca,Na)6(Si,Al)10O22(SO4,CO3,(OH)2)•(H2O)
Help on Composition: Composition: Molecular Weight = 1,101.39 gm
   Potassium   3.19 %  K     3.85 % K2O
   Sodium      1.04 %  Na    1.41 % Na2O
   Calcium    19.29 %  Ca   26.99 % CaO
   Magnesium   0.22 %  Mg    0.37 % MgO
   Aluminum    9.06 %  Al   17.13 % Al2O3
   Iron        0.51 %  Fe    0.65 % FeO
   Silicon    16.07 %  Si   34.37 % SiO2
   Hydrogen    0.27 %  H     2.45 % H2O
   Carbon      0.65 %  C     2.40 % CO2
   Sulfur      4.08 %  S    10.18 % SO3
   Oxygen     45.61 %  O
             ______        ______ 
             100.00 %       99.78 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.9Ca5.3Na0.5Mg0.1Fe2+0.1Si6.3Al3.7O22(SO4)1.4(CO3)0.6(OH)�(H2O)
Help on Environment: Environment: Within ejected blocks of metasomatized carbonate rocks in a pumice deposit.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Latera caldera, Pitigliano, near Grosseto, Tuscan, and at Sacrofano, Lazio, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Tuscany region of Italy where the mineral was first found.
Help on Name Pronunciation: Name Pronunciation: Tuscanite + Pronunciation Say TUSCANITE
Help on Synonym: Synonym: ICSD 9683
  PDF 29-1035

Tuscanite Image

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  Tuscanite   Augite

Comments: Translucent tuscanite microcrystal in in vug in low-Fe augite (var. fassaite).
Location: Pitigliano Quarry, Grosseto, Tuscany, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tuscanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =4.7037:1:2.1307
Help on Cell Dimensions: Cell Dimensions: a = 24.036, b = 5.11, c = 10.888, Z = 2; beta = 106.95° V = 1,279.21 Den(Calc)= 2.86
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.872(1), 11.51(1), 3.065(0.47),

Physical Properties of Tuscanite

Help on Cleavage: Cleavage: {100} Distinct
Help on Color: Color: Colorless.
Help on Density: Density: 2.83
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Tuscanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2054,KPDmeas= 0.2075,KC= 0.2072
Ncalc = 1.59
Help on Optical Data: Optical Data: Biaxial (-), a=1.581, b=1.59, g=1.591, bire=0.0100, 2V(Calc)=36, 2V(Meas)=40.

Calculated Properties of Tuscanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Tuscanite =2.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0086917947
Boson Index = 0.9913082053
Help on Photoelectric: Photoelectric: PETuscanite = 4.00 barns/electron
U=PETuscanite x relectron= 11.27 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 45.95 (Gamma Ray American Petroleum Institute Units)
Concentration of Tuscanite per GRapi unit = 2.18 (%)

Estimated Radioactivity from Tuscanite - barely detectable


Tuscanite Classification

Help on  Dana Class: Dana Class: (73)Phyllosilicate Condensed Tetrahedral Sheets
  (73.01)with double layers
  (73.01.02)Latiumite group Latiumite (Ca,K)8(Al,Mg,Fe)(Si,Al)10O25(SO4) P 21 2 Tuscanite K(Ca,Na)6(Si,Al)10O22(SO4,CO3,(OH)2)•(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.EG.45 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EG -Double nets with 6-membered and larger rings
09.EG.45 Latiumite (Ca,K)8(Al,Mg,Fe)(Si,Al)10O25(SO4) P 21 2
09.EG.45 Tuscanite K(Ca,Na)6(Si,Al)10O22(SO4,CO3,(OH)2)•(H2O) P 21/a 2/m

Other Tuscanite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Tuscanite :
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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Dana No: Strunz No: 09.EG.45





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