Allanite

Allanite is a sorosilicate group of minerals within the broader epidote group that contain a significant amount of rare earth elements. It has the general formula Ca(Ce,La,Y,Ca)Al2(Fe2+,Fe3+)(SiO4)(Si2O7)O(OH). The International Mineralogical Association lists three minerals in the allanite group, each recognized as a unique mineral: allanite-Ce, allanite-La and allanite-Y, depending on the dominant rare earth present.
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(n.)
A silicate containing a large amount of cerium. It is usually black in color, opaque, and is related to epidote in form and composition.
  

General Information:
 Chemical Formula:
(Ce,Ca,Y)2(Al,Fe+++)3(SiO4)3(OH)
 Composition:
(Molecular Weight = 614.71 gm)
Calcium 3.91 % Ca
Cerium 27.35 % Ce
Yttrium 4.34 % Y 
Aluminum 9.88 % Al
Iron 6.81 % Fe
Silicon 13.71 % Si
Hydrogen 0.16 % H 
Oxygen 33.84 % O 
 Empirical Formula:
Ce1.2Ca0.6Y0.3Al2.25Fe3+0.75(SiO4)3(OH)
 IMA Status:
Approved IMA 1959
 Locality:
TL: Greenland, Qaqarssuatsiaq
 Name Origin:
Named after the Scottish mineralogist, T. Allan (1777-1833).
Physical Properties:
 Cleavage:
[001] Imperfect, [100] Imperfect
 Color:
brown, reddish brown, or black.
 Density:
3.3 - 4.2, Average = 3.75
 Diaphaniety:
Translucent to opaque
 Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Disseminated - Occurs in small, distinct particles dispersed in matrix.,
 Hardness:
5.5 - Knife Blade
 Luminescence:
None.
 Luster:
Vitreous - Greasy
 Streak:
grayish brown
More details...

General Information:
 Chemical Formula:
Ca(La,Ce)(Fe++,Mn++)(Al,Fe+++)2(SiO4)(Si2O7)O(OH)
 Composition:
(Molecular Weight = 596.56 gm)
Calcium 6.72 % Ca
Lanthanum 17.46 % La
Cerium 5.87 % Ce
Manganese 2.30 % Mn
Aluminum 6.78 % Al
Iron 11.70 % Fe
Silicon 14.12 % Si
Hydrogen 0.17 % H 
Oxygen 34.87 % O 
 Empirical Formula:
CaLa0.75Ce0.25Fe2+0.75Mn2+0.25Al1.5Fe3+0.5(SiO4)(Si2O7)O(OH)
 IMA Status:
Not IMA Approved
 Locality:
TL: Russia, Karelia
 Name Origin:
Named after the Scottish mineralogist, T. Allan (1777-1833).
Physical Properties:
 Cleavage:
[001] Imperfect, [100] Imperfect
 Color:
brown or black.
 Density:
3.3 - 4.2, Average = 3.75
 Diaphaniety:
Translucent to opaque
 Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Disseminated - Occurs in small, distinct particles dispersed in matrix.,
 Hardness:
5.5 - Knife Blade
 Luminescence:
None.
 Luster:
Vitreous - Greasy
 Streak:
grayish brown
More details...

General Information:
 Chemical Formula:
(Y,Ce,Ca)2(Al,Fe+++)3(SiO4)3(OH)
 Composition:
(Molecular Weight = 598.63 gm)
Calcium 2.01 % Ca
Cerium 14.04 % Ce
Yttrium 17.82 % Y 
Aluminum 10.14 % Al
Iron 7.00 % Fe
Silicon 14.07 % Si
Hydrogen 0.17 % H 
Oxygen 34.74 % O 
 Empirical Formula:
Y1.2Ce0.6Ca0.3Al2.25Fe3+0.75(SiO4)3(OH)
 IMA Status:
Approved IMA 1987
 Name Origin:
Named after the Scottish mineralogist, T. Allan (1777-1833).
Physical Properties:
 Cleavage:
[001] Imperfect, [100] Imperfect
 Color:
brown or black.
 Density:
3.3 - 4.2, Average = 3.75
 Diaphaniety:
Translucent to opaque
 Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Disseminated - Occurs in small, distinct particles dispersed in matrix.,
 Hardness:
5.5 - Knife Blade
 Luminescence:
None.
 Luster:
Vitreous - Greasy
 Streak:
grayish brown
More details...

ALLANITE. ORTITE

B: (Kimia) alanit
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