Latiumite Mineral Data

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.

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

Diaphaniety:

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= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2075,KPDmeas= 0.2075,KC= 0.2048

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:

r_electron=2.91 gm/cc
note: r_Latiumite=2.93 gm/cc.

Fermion Index

Fermion Index = 0.00749
Boson Index = 0.99251

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)

Estimated Radioactivity from Latiumite - barely detectable

Latiumite Classification

Dana Class:

73.1.2.1 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.1)with double layers

(73.1.2)Latiumite group

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

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

Strunz Class:

VIII/H.06-10 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.06 - Latiumite - Tuscanite series

VIII/H.06-10 Latiumite (Ca,K)8(Al,Mg,Fe)(Si,Al)10O25(SO4) P 2₁ 2

VIII/H.06-20 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)

Search for Latiumite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Latiumite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Latiumite Mineral Data :

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: 73.1.2.1 Strunz No: VIII/H.06-10
Locality:

Notes: