Latiumite Mineral Data

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General Latiumite Information

Chemical Formula:

(Ca,K)8(Al,Mg,Fe)(Si,Al)10O25(SO4)

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

Empirical Formula:

Ca_5.9K_1.7Na_0.4Al_0.8Mg_0.2Fe²⁺_0.09Fe³⁺_0.07Si_5.3Al_4.7O₂₅(SO₄)_0.8(CO₃)_0.4

Environment:

In blocks of metamorphosed limestone ejected by volcanism.

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

From alban, in the Alban Hills, Lazio, and from Pitigliano, near Grosseto, Tuscany, Italy. Link to MinDat.org Location Data.

Name Origin:

For the Latin name of the district of origin, Latium, Italy.

Name Pronunciation:

Latiumite + Pronunciation

Synonym:

ICSD 10263

PDF 25-1202

Latiumite Image

Images:

Latiumite

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

Latiumite Crystallography

Axial Ratios:

a:b:c =2.374:1:2.1279

Cell Dimensions:

a = 12.06, b = 5.08, c = 10.81, Z = 1; beta = 106° V = 636.62 Den(Calc)= 2.93

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 2.86(1), 2.96(0.9), 3.06(0.9),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
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Cannillo E , Dal Negro A , Rossi G , American Mineralogist , 58 (1973) p.466-470, The crystal structure of latiumite, a new type of sheet silicate

Physical Properties of Latiumite

Cleavage:

{100} Perfect

Color:

White.

Density:

2.93

Diaphaneity:

Transparent to Translucent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Latiumite

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

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

Electron Density:

Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Latiumite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.0074956571
Boson Index = 0.9925043429

Photoelectric:

PE_Latiumite= 4.47 barns/electron
U=PE_Latiumite x r_electron= 13.00 barns/cc.

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

Dana Class:

73.01.02.01 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.01)with double layers

(73.01.02)Latiumite group

73.01.02.01 Latiumite (Ca,K)8(Al,Mg,Fe)(Si,Al)10O25(SO4) P 2₁ 2

73.01.02.02 Tuscanite K(Ca,Na)6(Si,Al)10O22(SO4,CO3,(OH)2)•(H2O) P 2₁/a 2/m

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

References:

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

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Latiumite Specimen Label here :

Latiumite

(Ca,K)8(Al,Mg,Fe)(Si,Al)10O25(SO4)
Dana No: 73.01.02.01 Strunz No: 09.EG.45
Locality:

Notes: