Latiumite (original) (raw)

A valid IMA mineral species - grandfathered

About LatiumiteHide

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Formula:

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

Colour:

White, may be zoned or mottled.

Crystal System:

Monoclinic

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.

A 2D-zeolite that - alongside with the related tuscanite - may be considered a prototype of advanced ion-exchange & ion/proton conductivity materials.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2336:4

cb05a668-5834-4c81-bd62-3e847ed012b1

IMA Classification of LatiumiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

Classification of LatiumiteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of LatiumiteHide

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Transparency:

Transparent, Translucent

Colour:

White, may be zoned or mottled.

Density:

2.93 g/cm3 (Measured) 2.92 g/cm3 (Calculated)

Optical Data of LatiumiteHide

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RI values:

_n_α = 1.600 - 1.603 _n_β = 1.606 - 1.609 _n_γ = 1.614 - 1.615

2V:

Measured: 83° to 90°, Calculated: 84° to 88°

δ = 0.014

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of LatiumiteHide

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Mindat Formula:

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

Common Impurities:

Mn,Na,Cl,H20,C

Crystallography of LatiumiteHide

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Crystal System:

Monoclinic

Class (H-M):

2 - Sphenoidal

Cell Parameters:

a = 12.06(1) Å, b = 5.08(2) Å, c = 10.81(1) Å
β = 106.0°

Ratio:

a:b:c = 2.374 : 1 : 2.128

Unit Cell V:

636.62 ų (Calculated from Unit Cell)

Twinning:

On {100} common, simple or multiple.

Crystal StructureHide

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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 DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of LatiumiteHide

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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:

Other Language Names for LatiumiteHide

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Relationship of Latiumite to other SpeciesHide

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Other Members of Latiumite Group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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 LatiumiteHide

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References for LatiumiteHide

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Reference List:

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 LatiumiteHide

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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

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- 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.