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Alpeite

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About AlpeiteHide

Formula:
Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6
Colour:
Brownish red
Lustre:
Vitreous, Silky
Hardness:
5½ - 6
Specific Gravity:
3.374 (Calculated)
Crystal System:
Orthorhombic
Member of:
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.


Classification of AlpeiteHide

Approved
Approval Year:
2016
First Published:
2017

Physical Properties of AlpeiteHide

Vitreous, Silky
Transparency:
Transparent
Colour:
Brownish red
Streak:
Beige
Hardness:
5½ - 6 on Mohs scale
Tenacity:
Brittle
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

Type:
Biaxial (-)
RI values:
nα = 1.747(3) nβ = 1.785(3) nγ = 1.808(3)
2V:
Measured: 73°
Max Birefringence:
δ = 0.061
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r>v, strong
Pleochroism:
Visible
Comments:
Y>Z>X in shades of reddish brown

Chemical Properties of AlpeiteHide

Formula:
Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6
IMA Formula:
Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(VO4)(OH)6

Crystallography of AlpeiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmmn
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
Unit Cell V:
1027.29 ų
Z:
2
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

Powder Diffraction Data:
d-spacingIntensity
4.049(52)
3.259(51)
3.022(93)
2.673(100)
2.572(69)
2.095(53)
1.677(52)
1.511(83)

Type Occurrence of AlpeiteHide

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+0.164.00(Mn3+1.33Al0.672.00(Al1.29Mn3+0.60V5+0.101.99(Mn3+0.70Mg0.65Al0.42Co2+0.201.97(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

Relationship of Alpeite to other SpeciesHide

Member of:
Other Members of this group:
Ardennite-(As)Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m)
Ardennite-(V)Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m) : Pmmn
KannaniteCa4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m) : Pmmn

Other InformationHide

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.

References for AlpeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Carbone, C., Nash, B. P., Belmonte, D., Chiappino, L., Castellaro, F. (2016): Alpeite, IMA 2016-072. CNMNC Newsletter No. 34, December 2016, page 1318. Mineralogical Magazine: 80: 1315–1321.
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.

Internet Links for AlpeiteHide

Localities for AlpeiteHide

ⓘ - 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 (TL)
 
  • Liguria
    • Genova and La Spezia Provinces
      • Tre Monti mining concession
        • Castiglione Chiavarese and Maissana
Kampf, A.R., Carbone, C., Nash, B. P., Belmonte, D., Chiappino, L. and Castellaro, F. (2016) Alpeite, IMA 2016-072. CNMNC Newsletter No. 34, December 2016, page 1318; Mineralogical Magazine, 80, 1315–1321; 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
    • Genova Province
      • Ne
        • Graveglia Valley
analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA
Mineral and/or Locality  
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