Latiumite Mineral Data

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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 - 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
15 - WWW-MINCRYST

Search for Latiumite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Latiumite :

A Bijoux Google Search for Latiumite
Adam's Minerals Google Search for Latiumite
Cape Minerals Google Search for Latiumite
Dakota Matrix Minerals Google Search for Latiumite
Excalibur Mineral Corp. Google Search for Latiumite
Exceptional Minerals Google Search for Latiumite
John Betts Fine Minerals Search for Latiumite
McDougall Minerals Google Search for Latiumite
Mineral News Website Link
Rock and Mineral Shows Google Search for Latiumite
Weinrich Minerals, Inc. Google Search for Latiumite

Ask about Latiumite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: