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Allanite-(Y)

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Formula:
{CaY}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Often slightly radioactive due to minor U and/or Th contents; therefore often metamict.
Colour:BlackHardness:5½ - 6½
Member of:Allanite Group > Epidote Supergroup
Name:Re-named, but not described, in 1966 by Alfred Abraham Levinson using what is now called the Levinson Rule whereby REE-dominant minerals are named by their root mineral name olus chemical suffixes. Allanite was named in 1810 by Thomas Thomson for Thomas Allan (1777-1833), Scottish mineralogist, who first observed "allanite". The -(Y) suffix was later added by Levinson (1966) to designate the Y-dominant member of the allanite group.


Allanite Subgroup of the Epidote Group.
Black usually massive mineral. Resinous when fresh, but frequently dulled by hydrothermal alteration or weathering.

Classification of Allanite-(Y)

IMA status:Approved
Strunz 8th edition ID:8/C.23-60
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:58.2.1a.3

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Hey's CIM Ref.:16.13.4

16 : Silicates Containing Aluminum and other Metals
13 : Aluminosilicates of the rare earths
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Physical Properties of Allanite-(Y)

Lustre:Sub-Vitreous, Resinous, Waxy, Greasy
Diaphaneity (Transparency):Opaque
Comment:May be dull due to alteration
Colour:Black
Streak:Light gray
Hardness (Mohs):5½ - 6½
Comment:May be softer due to alteration
Tenacity:Very brittle
Cleavage:Imperfect/Fair
{001} imperfect, {100} and {110} both poor
Fracture:Conchoidal, Sub-Conchoidal
Density (measured):3.5 - 4.2 g/cm3
Comment:Variable due to alteration

Crystallography of Allanite-(Y)

Morphology:Usually massive, rarely found in euhedral crystals. Tabular to prismatic crystals typical of allanite sub-group, rarely as rod-like crystals in sprays.
Comment:Unit cell dimensions unavailable, but should be near allanite-(Ce)
X-Ray Powder Diffraction:
d-spacingIntensity
Data not available(
Comments:d-values should be similar to allanite sub-group. Unit cell has typical epidote pseudocell (2a, b, 2c)

Optical Data of Allanite-(Y)

Type:Biaxial (-)
RI values: nα = 1.715 - 1.791 nβ = 1.718 - 1.815 nγ = 1.733 - 1.822
2V:Measured: 40° to 80°, Calculated: 50° to 56°
Birefringence:0.02
Maximum Birefringence:δ = 0.018 - 0.031

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:distinct to strong
Optical Extinction:Y=b, OAP || (010)

Chemical Properties of Allanite-(Y)

Formula:
{CaY}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)


Often slightly radioactive due to minor U and/or Th contents; therefore often metamict.
Simplified for copy/paste:{CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Essential elements:Al, Ca, Fe, H, O, Si, Y
All elements listed in formula:Al, Ca, Fe, H, O, Si, Y

Relationship of Allanite-(Y) to other Species

Member of:Allanite Group > Epidote Supergroup
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)
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)
Ferriakasakaite-(La)
CaLaFe
3+
 
AlMn
2+
 
(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Ferriallanite-(Ce)
{CaCe}{Fe
3+
 
AlFe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Ferriallanite-(La)
{CaLa}{Fe
3+
 
AlFe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Ferriandrosite-(La)
MnLaFe
3+
 
AlMn
2+
 
(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
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)
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)
Vanadoallanite-(La)
{CaLa}{V
3+
 
AlFe
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)
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.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.05bFerriallanite-(La)
{CaLa}{Fe
3+
 
AlFe
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
Related Minerals - Hey's Index Grouping:

- +
16.13.1Vyuntspakhkite-(Y)
(Y,Yb)
 
4
Al
 
2.5-1.5
(Si,Al)
 
1.5-2.5
(SiO
 
4
)
 
4
O(OH)
 
7
16.13.2Törnebohmite-(Ce)
(Ce,La)
 
2
Al(SiO
 
4
)
 
2
(OH)
16.13.3Törnebohmite-(La)
(La,Ce)
 
2
Al(SiO
 
4
)
 
2
(OH)
16.13.5Allanite-(Ce)
{CaCe}{Al
 
2
Fe
2+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
16.13.6Dollaseite-(Ce)
{CaCe}{MgAlMg}(Si
 
2
O
 
7
)(SiO
 
4
)(OH)F
16.13.8Dissakisite-(Ce)
{CaCe}{Al
 
2
Mg}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)

Other Names for Allanite-(Y)

Synonyms:
BodeniteYttro-orthite
Other Languages:
German:Allanit-(Y)
Yttro-orthit
Russian:Ортит-(Y)
Simplified Chinese:钇褐帘石

Other Information

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 Allanite-(Y)

Reference List:

- +
Frondel, J.W. (1964), Variation in some rare earths in allanite: American Mineralogist: 49: 1159-1177.

Dollase, W.A. (1971), Refinement of the crystal structures of epidote, allanite and hancockite: American Mineralogist: 56: 447-464.

Ercit, T.S. (2002): The mess that is “allanite”. Canadian Mineralogist, 40, 1411-1419.

Armbruster, T., Bonazzi, P., Akasaka, M., Bermanec, V., Chopin, C., Gieré R., Heuss-Assbichler, S., Liebscher, A., Menchetti, S., Pan, Y., Pasero, M. (2006): Recommended nomenclature of epidote-group minerals. European Journal of Mineralogy, 18, 551-567

Internet Links for Allanite-(Y)

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  • Localities for Allanite-(Y)

    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.
    (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.
    Australia
     
    • Western Australia
      • Mukinbudin Shire
        • Mukinbudin
    M. Jacobson, M. Calderwood, B. Grguric; Pegmatites of Western Australia; (Perth 2007)
    Canada
     
    • Ontario
      • Hastings Co.
        • Dungannon Township
    [Bancroft & District Mineral Collecting Guidebook]
      • Nipissing District
        • Murchison Township
    Dana's New Mineralogy
    • Québec
      • Abitibi-Témiscamingue
        • Rouyn-Noranda TE
    Galley, A.G., Jonasson, I.R., and Watkinson, D.H. (2000): Mineralium Deposita 35, 619-637.
      • Outaouais
        • Les Collines-de-l'Outaouais RCM
          • Val-des-Monts
            • Lac Saint-Pierre (Wakefield Lake)
    Hogarth, D.D. (1972): The Evans-Lou pegmatite, Quebec: a unique yttrium-niobium-bismuth-vanadium mineral assemblage. Mineralogical Record, 3 (2), 69-77.
    Finland
     
    • Lapland Region
      • Sodankylä
    Al-Ani Thair 2012. Detailed SEM study on REE-bearing minerals of paragneisses Mäkärä and Vaulo, Northern Finland. Geologian Tutkimuslaitos arkistoraportti 73/2011.
    Germany
     
    • Saxony
      • Erzgebirge
        • Marienberg District
    C. Kersten (1845): Ueber das Vorkommen von Yttererde- und Ceroxydul-Silikaten im sächsischen Erzgebirge.- Poggendorffs Annalen der Physik und Chemie 63, 135-141 (confirmed by SEM-EDX analysis 1999, T. Witzke)
    Italy
     
    • Lombardy
      • Varese Province
        • Ceresio Valley
    No reference listed
    • Piedmont
      • Verbano-Cusio-Ossola Province
        • Baveno
          • Oltrefiume
            • Mount Camoscio
    Grill, E. (1935): I minerali del granito di Baveno, la fayalite. Periodico di Mineralogia, 129-133. - Gallitelli, P. (1936): Le miche del granito di Baveno. . Periodico di Mineralogia, 61-76 - Pagliani, G. (1948): Le Zeoliti del granito di Baveno. Periodico di Mineralogia, 175-188. - Ravagnani, D. (1974): I giacimenti uraniferi italiani - Gruppo Mineralogico Lombardo - Museo Civico di Storia Naturale di Milano, Ed., Milano, 188 pp. - min. Rec. 14 (3), 157-168 - Am. Min. 83, 1330-1334 (1998) - Am. Min. 84, 782-789 (1999). - Guastoni, A. & Pezzotta, F. (2004): Kristiansenite a Baveno, second ritrovamento Mondiale della specie. Rivista Mineralogica Italiana, 4/2004, 247-251. - Guastoni, A., Demartin, F., Pezzotta, F. (2004): Sekaninaite delle pegmatiti granitiche di Feriolo e Baveno (VB). Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano, 145, 59-68. - Mineralogist americano (2005) 90, 1442-1452.
    American Mineralogist, 84(5-6), 782-789
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
          • Kawamata
            • Iizaka Village (Iisaka)
    Yamada et al (2004) Koubutsu-Gakkai Kouen-Youshi, 123.; Sueno, S., Matsuura, S., Bunno, M., & Kurosawa, M. (2002). Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferro-anthophyllite from Cheyenne Canyon and Cheyenne Mountain, USA and Hirukawa-mura, Suisho-yama, and Yokone-yama, Japan. Journal of mineralogical and petrological sciences, 97(4), 127-136.
    Norway
     
    • Buskerud
      • Modum
        • Snarum
    G. Raade (pers. comm. to U. Kolitsch, May 2009)
    • Nordland
      • Tysfjord
    Husdal, T. (2008): The minerals of the pegmatites within the Tysfjord granite, northern Norway. Norsk Bergverksmuseum, skrift 38, 5-28.
    Husdal, T. (2011): Tysfjordgranittens pegmatitter. Stein. 38 (4): 4-35
    Russia
     
    • Northern Region
      • Karelia Republic
        • Northern Karelia
          • Chupa pegmatite field
            • Chupa Bay
    E.I. Semenov data
    Spain
     
    • Madrid
    Garcia G., Gonzalez C., Bueno A. (2004) - Cadalso de los Vidrios (Madrid), Bocamina, n° 14, pp: 12-46.
    Sweden
     
    • Lappland
      • Jokkmokk
    • Småland
      • Vetlanda
        • Alseda
          • Slättåkra
    Blomstrand 1878
    • Värmland
      • Filipstad
        • Persberg district
    P.M. Kartashov data; Armbuster, T. et al.(2006): Recommended nomenclature of epidote-group minerals.European Journal of Mineralogy. 18, 551-567
    USA
     
    • Arizona
      • Mohave Co.
        • Aquarius Mts (Aquarius Range; Peacock Range)
    www.minresco.com/syst/a.htm
    • Colorado
      • Routt Co.
    Minerals of Colorado (1997) E.B. Eckels
    • New York
      • Essex Co.
    Rocks & Min. (2007) 82:242
          • Moriah Township
    http://gsa.confex.com/gsa/2005NE/finalprogram/abstract_83497.htm
    • Texas
      • Llano Co.
        • Bluffton
    U.S.Geological Survey Bulletin 340 (1908): 286-294.
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