Alpeite (original) (raw)
A valid IMA mineral species
About AlpeiteHide
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Formula:
Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6
Specific Gravity:
3.374 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for the type locality, Monte Alpe mine, Italy.
The Ca(Mn3+2Al2)-Mn3+ analogue of ardennite-(V).
At the type locality it crystallized from V- and Mn-rich hydrothermal fluids in an oxidizing environment.
In the structure of alpeite, Mn3+ is the dominant cation in the M1 site and is the dominant trivalent cation in the M3 site, while in all other members of the ardennite group, Al is the dominant cation in the M1 site and is the dominant trivalent cation in the M3 site.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:50779:4
61652023-cbaf-40a5-9813-9d3018226fec
IMA Classification of AlpeiteHide
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IMA Formula:
Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(VO4)(OH)6
Type description reference:
Classification of AlpeiteHide
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9.BJ.40
9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
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.
| Symbol | Source | Reference |
|---|---|---|
| Apt | 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 AlpeiteHide
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Cleavage:
Perfect
Perfect cleavage on {1 0 0} and good cleavages on {0 1 0 and {0 0 1}
Parting:
With a curved and stepped fracture
Density:
3.374 g/cm3 (Calculated)
Optical Data of AlpeiteHide
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RI values:
_n_α = 1.747(3) _n_β = 1.785(3) _n_γ = 1.808(3)
δ = 0.061
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
Y>Z>X in shades of reddish brown
Chemistry of AlpeiteHide
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Mindat Formula:
Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6
Crystallography of AlpeiteHide
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Crystal System:
Orthorhombic
Class (H-M):
m m m _(_2/_m_2/_m_2/m ) - Dipyramidal
Cell Parameters:
a = 8.942(1) Å, b = 6.0534(6) Å, c = 18.978(2) Å
Ratio:
a:b:c = 1.477 : 1 : 3.135
Morphology:
Intergrowths of plates, flattened on {1 0 0} and exhibiting the forms {1 0 0}, {0 0 1}, {0 1 2} and {1 0 2}.
Comment:
Space group setting is Pnmm
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.049 Å | (52) |
| 3.259 Å | (51) |
| 3.022 Å | (93) |
| 2.673 Å | (100) |
| 2.572 Å | (69) |
| 2.095 Å | (53) |
| 1.677 Å | (52) |
| 1.511 Å | (83) |
Geological EnvironmentHide
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Type Occurrence of AlpeiteHide
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General Appearance of Type Material:
Intergrowths of plates, flattened on {1 0 0} and exhibiting the forms {1 0 0}, {0 0 1}, {0 1 2} and {1 0 2}.
Place of Conservation of Type Material:
Mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA (catalogue number 66288)
Empirical Formula of Type Material:
(Ca3.84Mn2+0.16)Σ4.00(Mn3+1.33Al0.67)Σ2.00(Al1.29Mn3+0.60V5+0.10)Σ1.99(Mn3+0.70Mg0.65Al0.42Co2+0.20)Σ1.97(SiO4)2(Si3O10)[(V5+0.75Si0.25)O4](OH)6
Reference:
Kampf, A.R., Carbone, C., Belmonte, D., Nash, B.P., Chiappino, L., Castellaro, F. (2017): Alpeite, CaM4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6, a new ardennite-group mineral from Italy. European Journal of Mineralogy: 29: 907-914
Synonyms of AlpeiteHide
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Relationship of Alpeite to other SpeciesHide
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Other Members of this group:
| Ardennite-(As) | Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) |
|---|---|---|
| Ardennite-(Si) | ~Mn2+4Al4(AlMg)(SiO4,AsO4)(SiO4)2(Si3O10)(OH)6 | |
| Ardennite-(V) | Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m m n |
| Kannanite | Ca4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m m n |
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 9.BJ. | Arsenmedaite | Mn2+6 As5+Si5O18(OH) | Mon. 2/m |
|---|---|---|---|
| 9.BJ.05 | Orientite | Ca8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.BJ.10 | Rosenhahnite | HCa3[Si3O9(OH)] | Tric. 1 : _P_1 |
| 9.BJ.15 | Trabzonite | Ca4(Si3O9)(OH)2 | Orth. m _m_2 : A m _a_2 |
| 9.BJ.20 | Thalénite-(Y) | Y3Si3O10F | Mon. |
| 9.BJ.25 | Tiragalloite | Mn2+4As5+Si3O12(OH) | Mon. 2/m |
| 9.BJ.30 | Medaite | Mn2+6V5+Si5O18(OH) | Mon. 2/m |
| 9.BJ.35 | Ruizite | Ca2Mn3+2[Si4O11(OH)2](OH)2 · 2H2O | Mon. 2 |
| 9.BJ.35 | Taniajacoite | SrCaMn3+2Si4O11(OH)4 · 2H2O | Tric. 1 |
| 9.BJ.35 | Strontioruizite | Sr2Mn3+2Si4O11(OH)4 · 2H2O | Mon. 2 : _B_2 |
| 9.BJ.40 | Ardennite-(As) | Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.BJ.40 | Ardennite-(V) | Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m m n |
| 9.BJ.40 | Kannanite | Ca4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m m n |
| 9.BJ.45 | Kilchoanite | Ca6(SiO4)(Si3O10) | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.BJ.50 | Kornerupine | Mg3Al6(Si,Al,B)5O21(OH) | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 9.BJ.50 | Prismatine | (◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 9.BJ.55 | Zunyite | Al13Si5O20(OH,F)18Cl | Iso. 43_m_ : F_43_m |
| 9.BJ.60 | Hubeite | Ca2Mn2+Fe3+Si4O12(OH) · 2H2O | Tric. 1 : _P_1 |
| 9.BJ.65 | Cassagnaite | (Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8 | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 9.BJ.70 | Pavlovskyite | Ca8(SiO4)2(Si3O10) | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
Other InformationHide
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Notes:
Inert in concentrated HCl at room temperature
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 AlpeiteHide
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References for AlpeiteHide
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Reference List:
Localities for AlpeiteHide
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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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