Mineralogy Database

Latiumite Mineral Data

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General Latiumite Information

Help on Chemical  Formula: Chemical Formula: (Ca,K)8(Al,Mg,Fe)(Si,Al)10O25(SO4)
Help on Composition: Composition: Molecular Weight = 1,124.01 gm
   Potassium   5.91 %  K     7.12 % K2O
   Sodium      0.82 %  Na    1.10 % Na2O
   Calcium    21.04 %  Ca   29.44 % CaO
   Magnesium   0.43 %  Mg    0.72 % MgO
   Aluminum   13.20 %  Al   24.95 % Al2O3
   Iron        0.79 %  Fe    0.58 % FeO /  0.50 % Fe2O3
   Silicon    13.24 %  Si   28.33 % SiO2
   Carbon      0.43 %  C     1.57 % CO2
   Sulfur      2.28 %  S     5.70 % SO3
   Oxygen     41.85 %  O
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca5.9K1.7Na0.4Al0.8Mg0.2Fe2+0.09Fe3+0.07Si5.3Al4.7O25(SO4)0.8(CO3)0.4
Help on Environment: Environment: In blocks of metamorphosed limestone ejected by volcanism.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1953
Help on Locality: Locality: From alban, in the Alban Hills, Lazio, and from Pitigliano, near Grosseto, Tuscany, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the Latin name of the district of origin, Latium, Italy.
Help on Name Pronunciation: Name Pronunciation: Latiumite + Pronunciation Say LATIUMITE
Help on Synonym: Synonym: ICSD 10263
  PDF 25-1202

Latiumite Image

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Comments: Tan opaque prismatic crystals of latiumite.
Location: Capagnano, Lazio, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Latiumite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.374:1:2.1279
Help on Cell Dimensions: Cell Dimensions: a = 12.06, b = 5.08, c = 10.81, Z = 1; beta = 106° V = 636.62 Den(Calc)= 2.93
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.86(1), 2.96(0.9), 3.06(0.9),

Physical Properties of Latiumite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: White.
Help on Density: Density: 2.93
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Latiumite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2075,KPDmeas= 0.2075,KC= 0.2059
Ncalc = 1.6
Help on Optical Data: Optical Data: Biaxial (+/-), a=1.6-1.603, b=1.606-1.609, g=1.614-1.615, bire=0.0120-0.0140, 2V(Calc)=84-88, 2V(Meas)=83-90. Dispersion r > v marked.

Calculated Properties of Latiumite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Latiumite =2.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0074956571
Boson Index = 0.9925043429
Help on Photoelectric: Photoelectric: PELatiumite = 4.47 barns/electron
U=PELatiumite x relectron= 13.00 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 84.63 (Gamma Ray American Petroleum Institute Units)
Concentration of Latiumite per GRapi unit = 1.18 (%)

Estimated Radioactivity from Latiumite - barely detectable


Latiumite 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 Latiumite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Latiumite :
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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