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Latiumite

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Formula:
(Ca,K)4(Si,Al)5O11(SO4,CO3)
Hardness:
5½ - 6
Crystal System:
Monoclinic
Member of:
Name:
Named in 1953 by C.E. Tilley and N.F.M. Henry for Latium, the region of central western Italy that includes the type locality; this is the Latin form of the name, the modern name is Lazio.
This page provides mineralogical data about Latiumite.


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Classification of LatiumiteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.EG.45

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
73.1.2.1

73 : PHYLLOSILICATES Condensed Tetrahedral Sheets
1 : Condensed Tetrahedral Sheets with double layers
17.10.6

17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate

Physical Properties of LatiumiteHide

Hardness:
5½ - 6 on Mohs scale

Optical Data of LatiumiteHide

Type:
Biaxial (+/-)
RI values:
nα = 1.600 - 1.603 nβ = 1.606 - 1.609 nγ = 1.614 - 1.615
2V:
Measured: 83° to 90°, Calculated: 84° to 88°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v marked

Chemical Properties of LatiumiteHide

Formula:
(Ca,K)4(Si,Al)5O11(SO4,CO3)

Common Impurities:
Mn,Na,Cl,H20,C

Crystallography of LatiumiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 12.06 Å, b = 5.08 Å, c = 10.81 Å
β = 106°
Ratio:
a:b:c = 2.374 : 1 : 2.128
Unit Cell V:
636.62 ų (Calculated from Unit Cell)

Type Occurrence of LatiumiteHide

Other Language Names for LatiumiteHide

German:Latiumit
Spanish:Latiumita

Relationship of Latiumite to other SpeciesHide

Member of:
Other Members of this group:
LevantiteKCa3Al2(SiO4)(Si2O7)(PO4)Mon. 2 : P21

Common AssociatesHide

Associated Minerals Based on Photo Data:
Augite2 photos of Latiumite associated with Augite on mindat.org.
Grossular2 photos of Latiumite associated with Grossular on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EG.05CymriteBaAl2Si2(O,OH)8 · H2OMon.
9.EG.10Naujakasite(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26Mon. 2/m : B2/m
9.EG.10ManganonaujakasiteNa6(Mn2+,Fe2+)Al4Si8O26Mon.
9.EG.15DmisteinbergiteCa(Al2Si2O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
9.EG.20KampfiteBa12(Si11Al5)O31(CO3)8Cl5Mon. m
9.EG.25SträtlingiteCa2Al2SiO7 · 8H2OTrig.
9.EG.25VertumniteCa4Al4Si4O6(OH)24 · 3H2OMon. 2/m : P21/m
9.EG.30Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2OMon.
9.EG.30Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2OMon.
9.EG.30Tamaite(Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2OMon.
9.EG.35CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14Trig.
9.EG.35ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14Trig. 3 : R3
9.EG.40Franklinphilite(K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2OTric.
9.EG.40LennilenapeiteK6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2OTric.
9.EG.40Parsettensite(K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2OMon. 2/m : B2/m
9.EG.40Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2OTric. 1 : P1
9.EG.45Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2OMon.
9.EG.50JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex.
9.EG.55WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P3 1c
9.EG.60HyttsjöitePb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2OTrig.
9.EG.65ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2OMon. 2/m : B2/m
9.EG.70Britvinite[Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]Tric. 1 : P1
9.EG.75Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2OMon. 2/m : B2/b

Related Minerals - Dana Grouping (8th Ed.)Hide

73.1.2.2Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.10.1NoseanNa8(Al6Si6O24)(SO4) · H2OIso. 4 3m : P4 3n
17.10.2PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2OHex.
17.10.3Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63
17.10.4Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)Iso. 4 3m : P4 3n
17.10.5Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex.
17.10.7Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2OMon.
17.10.8MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2Hex.
17.10.9Delhayelite(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2OOrth.
17.10.10HydrodelhayeliteKCa2AlSi7O17(OH)2 · 6H2OOrth.
17.10.11Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2Hex. 6/m : P63/m
17.10.12Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P3 1c
17.10.13Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
17.10.14Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Hex.
17.10.15Sacrofanite(Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6•2H2OHex.
17.10.16Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2OOrth.
17.10.17InneliteNa2CaBa4Ti3(Si2O7)2(SO4)2O4Tric. 1 : P1
17.10.18ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
17.10.19Ellestadite
17.10.20ChlorellestaditeCa5(SiO4)1.5(SO4)1.5ClHex. 6/m : P63/m
17.10.21HydroxylellestaditeCa5(SiO4)1.5(SO4)1.5(OH)Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
17.10.22FluorellestaditeCa5(SiO4)1.5(SO4)1.5FHex.
17.10.23MattheddleitePb5(SiO4)1.5(SO4)1.5(Cl,OH)Hex. 6/m : P63/m
17.10.24QueititePb4Zn2(SO4)(SiO4)(Si2O7)Mon. 2 : P21
17.10.25RoeblingitePb2Ca6Mn2+(Si3O9)2(SO4)2(OH)2 · 4H2OMon. 2/m : B2/m
17.10.26YoshimuraiteBa2Mn2Ti(Si2O7)(PO4)O(OH)Tric. 1 : P1
17.10.27KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8Mon.
17.10.28Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2OHex.
17.10.29MacquartiteCu2Pb7(CrO4)4(SiO4)2(OH)2Mon.
17.10.30WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 : P3

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for LatiumiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Tilley, C.E., Henry, N.F.M. (1953) Latiumite (sulphatic potassium-calcium-aluminum silicate), a new mineral from Albano, Latium, Italy. Mineralogical Magazine: 30: 39-45.
Fleischer, M. (1954) New mineral names. American Mineralogist: 39: 402-408.
Leoni, L., Mellini, M., Merlino, S., Orlandi, P. (1970) Crystal chemistry of latiumite. Rendiconti della Società Italiana di Mineralogia e Petrologia, 33, 531-537.
Cannillo, E., Dal Negro, A., Rossi, G. (1973) The crystal structure of latiumite, a new type of sheet silicate. American Mineralogist, 58, 466-470.
Bonaccorsi, E., Ventura, M., Merlino, S. (2005) Latiumite and tuscanite: crystal chemistry and thermal behaviour. GeoItalia 2005, Quinto Forum Italiano di Scienze della Terra Spoleto 2005, vol. Abstract: 00-01.

Internet Links for LatiumiteHide

Localities for LatiumiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy
 
  • Latium
    • Rome Province
      • Alban Hills
De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol
        • Rocca di Papa
• Tilley, C.E. & Henry, N.F.M. (1953): Latiumite (sulphatic potassium-calcium-aluminum silicate), a new mineral from Albano, Latium, Italy. Mineralogical Magazine, 30, 39-45.
      • Campagnano di Roma
No reference listed
      • Sacrofano Caldera
        • Campagnano di Roma
    • Viterbo Province
      • Làtera volcano
        • Gradoli
- Signoretti, E. & Bosco, P. (2001): Le cave di Gradoli e Onano. Il Cercapietre, 1/2-2001, 10-25
        • Onano
Cresta, S., Duronio, F., Mancinella, D. (2002): Geositi e sistema delle arre protette del Lazio: idee per la geoconservazione. Il Cercapietre, 1-2/2002, 48-55
  • Tuscany
    • Grosseto Province
      • Pitigliano
Liotti L., 1991. I minerali dei vulcani laziali a Pitigliano (Grosseto). Riv. Mineral. Ital., 15 (3): 121-139.
Mineral and/or Locality  
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