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Ferriallanite-(La)

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Formula:
{CaLa}{Fe
3+
 
AlFe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
System:MonoclinicColour:Black
Hardness:6
Member of:Epidote Group
Name:La-dominant analogue of ferriallanite-(Ce).


The lanthanum-dominant analogue of ferriallanite-(Ce).
Quantitative chemical analyses are needed to distinguish the species from La- and Fe-rich allanite-(Ce).

Classification of Ferriallanite-(La)

IMA status:Approved 2011
Strunz 9th edition ID:9.BG.05
Nickel-Strunz 10th (pending) edition ID:9.BG.05b

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
Dana 8th edition ID:56.2.7.2

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
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Type Occurrence of Ferriallanite-(La)

Type Locality:In den Dellen quarries, Niedermendig, Mendig, Laach lake volcanic complex, Eifel, Rhineland-Palatinate, Germany
General Appearance of Type Material:Single, thick, tabular {100} crystal (2 mm in its longest dimension).
Place of Conservation of Type Material:Holotype: Natural History Museum, Vienna (Austria), registered no. N8164.
Co-type (probe mount): Museum Victoria, Melbourne (Australia), registered no. M49750.
Geological Setting of type material:In a void of a sanidinite xenolith.
Associated Minerals at type locality:
SanidineNoseanMagnetiteClinopyroxene SubgroupBiotite

Physical Properties of Ferriallanite-(La)

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Black
Streak:Brown
Hardness (Mohs):6
Hardness Data:Estimated
Tenacity:Brittle
Cleavage:None Observed
Fracture:Irregular/Uneven, Conchoidal
Density (calculated):4.208 g/cm3

Crystallography of Ferriallanite-(La)

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Space Group Setting:P21/m
Cell Parameters:a = 8.938(2) Å, b = 5.789(1) Å, c = 10.153(2) Å
β = 114.54(3)°
Ratio:a:b:c = 1.544 : 1 : 1.754
Unit Cell Volume:V 477.88 ų
Z:2
Morphology:The crystal is thick tabular on {100}, with additional, minor forms being small {101} or {110} and {1k0} or {10l}; very small {010} or {001}.
Twinning:No twinning was observed.
X-Ray Powder Diffraction:
d-spacingIntensity
9.22 (19)
7.96 (34)
3.53 (38)
2.92 (100)
2.72 (50)
2.63 (36)
2.16 (17)
1.639 (34)

Optical Data of Ferriallanite-(La)

Type:Biaxial (-)
RI values: nα = 1.791(5) nβ = 1.827(6) nγ = 1.845(5)
2V:Calculated: 69°
Maximum Birefringence:δ = 0.054

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:Weak
Pleochroism:Strong
Comments:X = pale brownish, Y = greyish brown, Z = dark red-brown.

Chemical Properties of Ferriallanite-(La)

Formula:
{CaLa}{Fe
3+
 
AlFe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Essential elements:Al, Ca, Fe, H, La, O, Si
All elements listed in formula:Al, Ca, Fe, H, La, O, Si
Analytical Data:Average of electron-microprobe analyses; water content was estimated from the stoichiometry. Sample from the type locality.
SiO2 (30.22)
TiO2 (2.24)
Al2O3 (10.37)
Fe2O3 (11.05)
FeO (5.83)
MnO (3.43)
MgO (0.36)
CaO (9.46)
La2O3 (13.17)
Ce2O3 (11.58)
Pr2O3 (0.50)
Nd2O3 (0.57)
Y2O3 (0.02)
ThO2 (3.64)
H2O (1.55)
Total (102.44)
Empirical Formula:
Ca
 
1.01
(La
 
0.49
Ce
 
0.42
Th
 
0.08
Nd
 
0.02
Pr
 
0.02
)(Fe
3+
0.83
Al
 
0.17
)Al
 
1.00
(Fe
2+
0.49
Mn
 
0.29
Ti
 
0.17
Mg
 
0.05
)[(Si
 
0.95
Al
 
0.05
)O
 
4
](Si
 
2.00
O
 
7
)O(OH)
Common Impurities:Ce,Mg,Mn,Th,Ti

Relationship of Ferriallanite-(La) to other Species

Member of:Epidote Group
Other Members of Group:

- +
Allanite-(Ce)
{CaCe}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Allanite-(La)
{CaLa}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Allanite-(Nd)
{CaNd}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Allanite-(Y)
{CaY}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Åskagenite-(Nd)
{Mn
2+
 
Nd}{Al
 
2
Fe
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O
 
2
Clinozoisite
{Ca
 
2
}{Al
 
3
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Clinozoisite-(Sr)
{CaSr}{Al
 
3
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Dissakisite-(Ce)
{CaCe}{Al
 
2
Mg}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Dissakisite-(La)
{CaLa}{Al
 
2
Mg}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Dollaseite-(Ce)
{CaCe}{MgAlMg}(Si
 
2
O
 
7
)(SiO
 
4
)(OH)F
Epidote
{Ca
 
2
}{Al
 
2
Fe
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Epidote-(Pb)
{CaPb}{Al
 
2
Fe
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Epidote-(Sr)
{CaSr}{Al
 
2
Fe
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Ferriallanite-(Ce)
{CaCe}{Fe
3+
 
AlFe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Khristovite-(Ce)
{CaCe}{MgAlMn
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)(OH)F
Manganiandrosite-(Ce)
{(Mn
2+
 
,Ca)(Ce,REE)}{Mn
3+
 
AlMn
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Manganiandrosite-(La)
{Mn
2+
 
La}{Mn
3+
 
AlMn
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Manganipiemontite-(Sr)
{CaSr}{Mn
3+
 
AlMn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Mukhinite
{Ca
 
2
}{Al
 
2
V
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Piemontite
{Ca
 
2
}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Piemontite-(Pb)
CaPbAl
 
2
Mn
3+
 
[Si
 
2
O
 
7
][SiO
 
4
]O(OH)
Piemontite-(Sr)
{CaSr}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Uedaite-(Ce)
{Mn
2+
 
Ce}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Unnamed (Ca-analogue of Manganiandrosite-(La))
{(Ca,(La,REE),Mn
2+
 
)
 
2
}{(Mn
3+
 
,Fe
3+
 
,Al)Al(Mn
2+
 
,Mg)}(Si
 
2
O
 
7
)((Si,Al,As)O
 
4
)O(OH)
Unnamed (Mg-analogue of Ferriallanite-(Ce))
{CaCe}{(Fe
3+
 
,Al)Al(Mg,Fe
2+
 
)}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Unnamed (Mn-analogue of Ferriallanite-(Ce))
{CaCe}{Fe
3+
 
AlMn
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Vanadoandrosite-(Ce)
{Mn
2+
 
Ce}{V
3+
 
AlMn
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Zoisite
{Ca
 
2
}{Al
 
3
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Related Minerals - Nickel-Strunz Grouping):

- +
9.BG.05bAllanite-(Ce)
{CaCe}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05bAllanite-(La)
{CaLa}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05bAllanite-(Y)
{CaY}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05aClinozoisite
{Ca
 
2
}{Al
 
3
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05bDissakisite-(Ce)
{CaCe}{Al
 
2
Mg}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Dollaseite-(Ce)
{CaCe}{MgAlMg}(Si
 
2
O
 
7
)(SiO
 
4
)(OH)F
9.BG.05aEpidote
{Ca
 
2
}{Al
 
2
Fe
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Epidote-(Pb)
{CaPb}{Al
 
2
Fe
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Khristovite-(Ce)
{CaCe}{MgAlMn
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)(OH)F
9.BG.05Mukhinite
{Ca
 
2
}{Al
 
2
V
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Piemontite
{Ca
 
2
}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Piemontite-(Sr)
{CaSr}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05bManganiandrosite-(La)
{Mn
2+
 
La}{Mn
3+
 
AlMn
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Tawmawite
{Ca
 
2
}{(Al,Fe
3+
 
,Cr)
 
3
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Manganipiemontite-(Sr)
{CaSr}{Mn
3+
 
AlMn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05bFerriallanite-(Ce)
{CaCe}{Fe
3+
 
AlFe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Clinozoisite-(Sr)
{CaSr}{Al
 
3
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Manganiandrosite-(Ce)
{(Mn
2+
 
,Ca)(Ce,REE)}{Mn
3+
 
AlMn
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Dissakisite-(La)
{CaLa}{Al
 
2
Mg}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Vanadoandrosite-(Ce)
{Mn
2+
 
Ce}{V
3+
 
AlMn
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Uedaite-(Ce)
{Mn
2+
 
Ce}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Epidote-(Sr)
{CaSr}{Al
 
2
Fe
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05bAllanite-(Nd)
{CaNd}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05bÅskagenite-(Nd)
{Mn
2+
 
Nd}{Al
 
2
Fe
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O
 
2
9.BG.10Zoisite
{Ca
 
2
}{Al
 
3
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.15Macfallite
Ca
 
2
(Mn
3+
 
,Al)
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
3
9.BG.15Sursassite
Mn
2+
2
Al
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
3
9.BG.20Julgoldite-(Fe2+)
Ca
 
2
(Fe
2+
 
,Mg)(Fe
3+
 
,Al)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
 · H
 
2
O
9.BG.20Okhotskite
Ca
 
2
(Mn
2+
 
,Mg)(Mn
3+
 
,Al,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
 · H
 
2
O
9.BG.20Pumpellyite-(Fe2+)
Ca
 
2
Fe
2+
 
Al
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
 · H
 
2
O
9.BG.20Pumpellyite-(Fe3+)
Ca
 
2
(Fe
3+
 
,Mg,Fe
2+
 
)(Al,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH,O)
 
2
 · H
 
2
O
9.BG.20Pumpellyite-(Mg)
Ca
 
2
MgAl
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
 · H
 
2
O
9.BG.20Pumpellyite-(Mn2+)
Ca
 
2
(Mn
2+
 
,Mg)(Al,Mn
3+
 
,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
 · H
 
2
O
9.BG.20Shuiskite
Ca
 
2
(Mg,Al)(Cr,Al)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
 · 2H
 
2
O
9.BG.20Julgoldite-(Fe3+)
Ca
 
2
(Fe
3+
 
,Mg)(Fe
3+
 
,Al)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH,O)
 
2
 · H
 
2
O
9.BG.20Pumpellyite-(Al)
Ca
 
2
(Al,Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH,O)
 
2
 · H
 
2
O
9.BG.20Poppiite
Ca
 
2
(V
3+
 
,Fe
3+
 
,Mg)(V
3+
 
,Al)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH,O)
 
2
 · H
 
2
O
9.BG.20Julgoldite-(Mg)
Ca
 
2
(Mg,Fe
2+
 
)(Fe
3+
 
,Al)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
 · H
 
2
O
9.BG.25Ganomalite
Pb
 
9
Ca
 
5
Mn(Si
 
2
O
 
7
)
 
4
(SiO
 
4
)O
9.BG.30Rustumite
Ca
 
10
(Si
 
2
O
 
7
)
 
2
(SiO
 
4
)(OH)
 
2
Cl
 
2
9.BG.35Vesuvianite
(Ca,Na,☐)
 
19
(Al,Mg,Fe
3+
 
)
 
13
(☐,B,Al,Fe
3+
 
)
 
5
(Si
 
2
O
 
7
)
 
4
(SiO
 
4
)
 
10
(OH,F,O)
 
10
9.BG.35Wiluite
Ca
 
19
(Al,Mg)
 
13
(B,☐,Al)
 
5
(Si
 
2
O
 
7
)
 
4
(SiO
 
4
)
 
10
(O,OH)
 
10
9.BG.35Manganvesuvianite
Ca
 
19
Mn
3+
 
(Al,Mn
3+
 
,Fe
3+
 
)
 
10
(Mg,Mn
2+
 
)
 
2
(Si
 
2
O
 
7
)
 
4
(SiO
 
4
)
 
10
O(OH)
 
9
9.BG.35Fluorvesuvianite
Ca
 
19
(Al,Mg,Fe
2+
 
)
 
13
(Si
 
2
O
 
7
)
 
4
(SiO
 
4
)
 
10
O(F,OH)
 
9
9.BG.40Vyuntspakhkite-(Y)
(Y,Yb)
 
4
Al
 
2.5-1.5
(Si,Al)
 
1.5-2.5
(SiO
 
4
)
 
4
O(OH)
 
7
9.BG.45Dellaite
Ca
 
6
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
9.BG.50Gatelite-(Ce)
CaCe
 
3
Al
 
2
(Al,Mg)(Mg,Fe
2+
 
,Al)(Si
 
2
O
 
7
)(SiO
 
4
)
 
3
(O,F)(OH,O)
 
2
9.BG.55Västmanlandite-(Ce)
Ca(Ce,La)
 
3
Al
 
2
Mg
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)
 
3
(OH)
 
2
F

Other Names for Ferriallanite-(La)

Synonyms:
IMA2010-066
Other Languages:

Other Information

Fluorescence in UV light:Non-fluorescent
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ferriallanite-(La)

Reference List:

- +
Kolitsch, U., Mills, S.J., Miyawaki, R., and Blaß, G. (2011): Ferriallanite-(La), IMA2010-066. CNMNC Newsletter 8, 290; Mineralogical Magazine 75, 289-294.

Kolitsch, U., Mills, S.J., Miyawaki, R. & Blass, G. (2012): Ferriallanite-(La), a new member of the epidote supergroup from the Eifel, Germany. European Journal of Mineralogy, 24, 741-747.

Internet Links for Ferriallanite-(La)

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    • Localities for Ferriallanite-(La)

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Laach lake volcanic complex
          • Mendig
            • Niedermendig
    		Kolitsch, U., Mills, S.J., Miyawaki, R., and Blaß, G. (2011): CNMNC Newsletter 8, 290; Kolitsch, U., Mills, S.J., Miyawaki, R. & Blass, G. (2012): Ferriallanite-(La), a new member of the epidote supergroup from the Eifel, Germany. European Journal of Mineralogy, 24, 741-747.
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