Latiumite
A valid IMA mineral species - grandfathered
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About Latiumite
Lago Albano, Roma, Italy
Albano Lake crater, Alban Hills, Metropolitan City of Rome Capital, Lazio, Italy
Albano Lake crater, Alban Hills, Metropolitan City of Rome Capital, Lazio, Italy
Formula:
(Ca,K)4(Si,Al)5O11(SO4,CO3)
Colour:
White, may be zoned or mottled.
Lustre:
Vitreous
Hardness:
5½ - 6
Specific Gravity:
2.93
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.
Unique Identifiers
Mindat ID:
2336
Long-form identifier:
mindat:1:1:2336:4
GUID
(UUID V4):
(UUID V4):
cb05a668-5834-4c81-bd62-3e847ed012b1
IMA Classification of Latiumite
Approved, 'Grandfathered' (first described prior to 1959)
Classification of Latiumite
9.EG.45
9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
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
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
17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Lat | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Latiumite
Vitreous
Transparency:
Transparent, Translucent
Colour:
White, may be zoned or mottled.
Hardness:
5½ - 6 on Mohs scale
Cleavage:
Perfect
{100}
{100}
Density:
2.93 g/cm3 (Measured) 2.92 g/cm3 (Calculated)
Optical Data of Latiumite
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v marked
Chemistry of Latiumite
Mindat Formula:
(Ca,K)4(Si,Al)5O11(SO4,CO3)
Common Impurities:
Mn,Na,Cl,H20,C
Crystallography of Latiumite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 12.06(1) Å, b = 5.08(2) Å, c = 10.81(1) Å
β = 106.0°
β = 106.0°
Ratio:
a:b:c = 2.374 : 1 : 2.128
Unit Cell V:
636.62 ų (Calculated from Unit Cell)
Z:
2
Twinning:
On {100} common, simple or multiple.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000319 | Latiumite | Cannillo E, Dal Negro A, Rossi G (1973) The crystal structure of latiumite, a new type of sheet silicate American Mineralogist 58 466-470 |  | 1973 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.86 Å | (s1) |
| 3.06 Å | (s2) |
| 2.96 Å | (s3) |
| 2.54 Å | (s) |
| 4.6 Å | (m) |
| 4.5 Å | (m) |
| 3.83 Å | (m) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations |
Type Occurrence of Latiumite
Place of Conservation of Type Material:
Cambridge University, Cambridge, England, 45482, 29799
Geological Setting of Type Material:
metamorphosed limestone ejected by volcanism.
Associated Minerals at Type Locality:
Reference:
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.
Other Language Names for Latiumite
Relationship of Latiumite to other Species
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.EG.05 | Cymrite | BaAl2Si2(O,OH)8 · H2O |
| 9.EG.10 | Naujakasite | (Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26 |
| 9.EG.10 | Manganonaujakasite | Na6(Mn2+,Fe2+)Al4Si8O26 |
| 9.EG.15 | Dmisteinbergite | Ca(Al2Si2O8) |
| 9.EG.20 | Kampfite | Ba12(Si11Al5)O31(CO3)8Cl5 |
| 9.EG.25 | Strätlingite | Ca2Al2SiO7 · 8H2O |
| 9.EG.25 | Vertumnite | Ca4Al4Si4O6(OH)24 · 3H2O |
| 9.EG.30 | Eggletonite | (Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O |
| 9.EG.30 | Ganophyllite | (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O |
| 9.EG.30 | Tamaite | (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O |
| 9.EG.35 | Coombsite | KMn2+13(Si,Al)18O42(OH)14 |
| 9.EG.35 | Zussmanite | K(Fe,Mg,Mn)13(Si,Al)18O42(OH)14 |
| 9.EG.40 | Franklinphilite | (K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2O |
| 9.EG.40 | Lennilenapeite | K6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2O |
| 9.EG.40 | Parsettensite | (K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2O |
| 9.EG.40 | Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| 9.EG.40 | Chalcodite | K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27 |
| 9.EG.45 | Tuscanite | KCa6(Si,Al)10O22(SO4,CO3)2(OH) · H2O |
| 9.EG.45 | Levantite | KCa3Al2(SiO4)(Si2O7)(PO4) |
| 9.EG.50 | Jagoite | Pb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6 |
| 9.EG.55 | Wickenburgite | CaPb3Al2Si10O24(OH)6 |
| 9.EG.60 | Hyttsjöite | Pb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2O |
| 9.EG.65 | Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
| 9.EG.70 | Britvinite | [Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)] |
| 9.EG.70 | Roymillerite | Pb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5 |
| 9.EG.75 | Bannisterite | (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O |
| 9.EG.75 | UM1989-30-SiO:AlBaCaFeHKMgMn | (Ba,Ca)(Mn,Fe,Mg)22(Si,Al)32O76(OH)16 · 12H2O |
| 9.EG.75 | Kayupovaite | Na2Mn10[(Si14Al2)O38(OH)8] · 7H2O |
Other Information
Thermal Behaviour:
Fuses before the blowpipe. The resulting glass partly devitrifies at a low read heat to a fine grained product.
Notes:
Soluble in weak acids, leaving a silica residue.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Latiumite
mindat.org URL:
https://www.mindat.org/min-2336.html
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References for Latiumite
Reference List:
Carinillo, Elio, Dal Negro, A., Rossi, Giuseppe (1973) The crystal structure of latiumite, a new type of sheet silicate. American Mineralogist, 58 (5-6) 466-470
Zubkova, Natalia V., Chukanov, Nikita V., Varlamov, Dmitry A., Vigasina, Marina F., Pekov, Igor V., Ksenofontov, Dmitry A., Pushcharovsky, Dmitry Yu. (2023) New data on the crystal chemistry of the natural two-layer aluminosilicates latiumite and tuscanite. Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, 79 (4) 296-304 doi:10.1107/s2052520623004638
Localities for Latiumite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
France | |
| publication date: November 2018 +1 other reference |
Italy (TL) | |
| Tilley et al. (1953) +2 other references |
| De Michele (1974) +1 other reference | |
| Rossano Carlini collection | |
| |
| Tilley et al. (1953) |
| Signoretti et al. (2001) |
| Cresta et al. (2002) |
| Liotti L. (Grosseto) |
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Case Collina, Pitigliano, Grosseto Province, Tuscany, Italy