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Alloriite
A valid IMA mineral species
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About Alloriite
Roberto Allori
Formula:
(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6
Colour:
Colourless to pale violet
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.35
Crystal System:
Trigonal
Member of:
Name:
For Roberto Allori (b. 1933, Livorno, Tuscany, Italy), Italian amateur mineralogist and collector, who found the mineral. He assembled one of the largest systematic collections in the world.
Unique Identifiers
Mindat ID:
29546
Long-form identifier:
mindat:1:1:29546:4
Similar Names
IMA Classification of Alloriite
Approved
IMA Formula:
(Na,K,Ca)24(Na,Ca)4Ca4(Si,Al)48O96(S6+O4)4(S4+O3,CO3)2(OH,Cl)2(H2O,OH)4
Approval year:
2006
First published:
2007
Classification of Alloriite
9.FB.05
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
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 for Standard |
|---|---|---|
| Aor | 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 Alloriite
Vitreous
Transparency:
Transparent
Colour:
Colourless to pale violet
Streak:
White
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Parallel to {1010}
Parallel to {1010}
Density:
2.35 g/cm3 (Measured) 2.358 g/cm3 (Calculated)
Optical Data of Alloriite
Type:
Uniaxial (+)
RI values:
nω = 1.497(2) nε = 1.499(2)
Max. Birefringence:
δ = 0.002
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Alloriite
Mindat Formula:
(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6
Element Weights:
Crystallography of Alloriite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P31c
Cell Parameters:
a = 12.892(3) Å, c = 21.340(5) Å
Ratio:
a:c = 1 : 1.655
Unit Cell V:
3,071.61 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0012512 | Alloriite | Rastsvetaeva R K, Ivanova A G, Chukanov N V, Verin I A (2007) Crystal structure of alloriite Doklady Earth Sciences 415 815-819 | 2007 | Sabatino volcanic complex, Latium, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.3 Å | (70) |
| 4.85 Å | (90) |
| 4.03 Å | (60) |
| 3.76 Å | (80) |
| 3.68 Å | (70) |
| 3.33 Å | (100) |
| 2.795 Å | (60) |
| 2.694 Å | (70) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Alloriite
General Appearance of Type Material:
Tabular to stout, six-sided prismatic crystals.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow. The registration number is 3459/1.
Associated Minerals at Type Locality:
Synonyms of Alloriite
Other Language Names for Alloriite
Relationship of Alloriite to other Species
Member of:
Other Members of Cancrinite Group:
| Afghanite | (Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6 | Trig. 3m : P31c |
| Balliranoite | (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) | Hex. 6 : P63 |
| Betzite | Na6Ca2(Al6Si6O24)Cl4 | Hex. 6 : P63 |
| Biachellaite | (Na,Ca,K)8(Al6Si6O24)(SO4)2(OH)0.5 · H2O | Trig. 3 : P3 |
| Bystrite | (Na,K)7Ca(Al6Si6O24)(S5)Cl | Trig. 3m : P31c |
| Cancrinite | (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O | Hex. 6 : P63 |
| Cancrisilite | Na7(Al5Si7O24)(CO3) · 3H2O | Hex. 6mm : P63mc |
| Carbobystrite | Na8(Al6Si6O24)(CO3) · 3.5H2O | Trig. 3m : P31c |
| Davyne | (Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2 | Hex. 6/m : P63/m |
| Depmeierite | Na8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5) | Hex. 6 : P63 |
| Fantappièite | [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2O | Trig. 3 : R3 |
| Farneseite | (Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2O | Hex. 6/m : P63/m |
| Franzinite | (Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2O | Hex. |
| Giuseppettite | (Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2 | Trig. 3m : P31c |
| Hydroxycancrinite | Na8(Al6Si6O24)(OH)2 · 2H2O | Hex. 6 : P63 |
| Kircherite | Na5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2O | Trig. 32 : R32 |
| Kyanoxalite | Na7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5) | Hex. 6 : P63 |
| Liottite | (Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4 | Hex. 6 : P6 |
| Marinellite | (Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2O | Trig. 3m : P31c |
| Microsommite | Na4K2Ca2(Al6Si6O24)(SO4)Cl2 | Hex. 622 : P6322 |
| Pitiglianoite | Na6K2(Al6Si6O24)(SO4) · 2H2O | Hex. 6 : P63 |
| Quadridavyne | (Na,K)6Ca2(Al6Si6O24)Cl4 | Hex. 6/m : P63/m |
| Sacrofanite | (Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6 · 2H2O | Hex. |
| Steudelite | Na3(K17Ca7)Ca4(Al24Si24O96)(SO3)6F6 · 4H2O | Hex. 6m2 : P62c |
| Sulfhydrylbystrite | Na5K2Ca[Al6Si6O24](S5)2(SH) | Trig. 3m : P31c |
| Tounkite | (Na,Ca,K)8(Si6Al6)O24(SO4)2Cl · 0.5H2O | Hex. 622 : P6222 |
| 'UM2004-48-SiO:AlClCaNaS' | (Na,Ca)8(Si6Al6)O24(SO4)1.7Cl1.3 | |
| 'UM2009-23-SiO:AlCCaClHKNaS' | (Na,Ca)24K10[(Si,Al)60O120](SO4)5.6Cl1.5(CO3)0.4 · 11H2O | Trig. 3 : P3 |
| Vishnevite | (Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2O | Hex. 6 : P63 |
Related Minerals - Strunz-mindat Grouping
| 9.FB. | Perchukite-(Y) | PbYAsSi2O8 |
| 9.FB. | Åsgruvanite-(Ce) | Ce16Ca5Al(SiO4)6(AsO3)8(CO3)2Cl4F3(OH)2 |
| 9.FB. | Steudelite | Na3(K17Ca7)Ca4(Al24Si24O96)(SO3)6F6 · 4H2O |
| 9.FB. | Wenlanzhangite-(Y) | Y2V3+2V4+2(SiO4)2O4(OH)4 |
| 9.FB. | Slyudyankaite | Na28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2) · 2H2O |
| 9.FB. | Bolotinaite | (Na7◻)(Al6Si6O24)F · 4H2O |
| 9.FB. | Sapozhnikovite | Na8(Al6Si6O24)(HS)2 |
| 9.FB. |
Monte Cavalluccio, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy