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Dissakisite-(La)

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Mochalin Log (Motchaline-log), Kyshtym (Kychtym; Kishtim), Chelyabinsk Oblast', Urals Region, Russia
© Pavel M. Kartashov

Formula:
{CaLa}{Al
 
2
Mg}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
System:MonoclinicColour:Black to very dark brown.
Hardness:6½ - 7
Name:For its close relationship with dissakisite-(Ce).


Epidote Group.

Classification of Dissakisite-(La)

IMA status:Approved 2003
Strunz 8th edition ID:8/C.23-57
Nickel-Strunz 10th (pending) edition ID:9.BG.05

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
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Type Occurrence of Dissakisite-(La)

Type Locality:Vedetta Alta (Hochwart), Ultimo Valley (Ulten Valley), Bolzano Province (South Tyrol), Trentino-Alto Adige, Italy
General Appearance of Type Material:Up to 2.5cm-sized black to very dark brown anhedral nodules, thick blades and smaller grains.
Place of Conservation of Type Material:(-) Muséum National d'Histoire Naturelle, Paris, France (203.133)
(-) Museo di Mineralogia e Petrologia dell'Università di Padova, Padova, Italy
Geological Setting of type material:In Alpine-type peridotite, under eclogite-facies conditions.
Associated Minerals at type locality:
ZirconUraniniteThoriteThorianiteSpinel
Pyroxene GroupPhlogopitePentlanditeOlivineDolomite
Copper SulfidesClinochloreCalciteApatiteAmphibole Group

Physical Properties of Dissakisite-(La)

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Black to very dark brown.
Streak:Grey-greenish
Hardness (Mohs):6½ - 7
Tenacity:Brittle
Cleavage:Imperfect/Fair
(001)
Fracture:Conchoidal
Density (measured):3.79 g/cm3
Density (calculated):3.84 g/cm3

Crystallography of Dissakisite-(La)

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m (P1 1 21/m) [P21/m] {P1 21/m 1}
Cell Parameters:a = 8.9616Å, b = 5.7265Å, c = 10.2353Å
α = 115.193°
Ratio:a:b:c = 1.565 : 1 : 1.787
Unit Cell Volume:V 475.3 ų
Z:2

Chemical Properties of Dissakisite-(La)

Formula:
{CaLa}{Al
 
2
Mg}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Essential elements:
All elements listed in formula:Al, Ca, H, La, Mg, O, Si
Analyical Data:The La/(La + Ce) ratio is 0.545(16) in the type analysis and 0.543(18) in an average of 70 analyses of the type sample A4310
Empirical Formula:
(Ca
 
1.195
Mn
 
0.009
Sr
 
0.010
Na
 
0.002
Th
 
0.090
U
 
0.003
La
 
0.315
Ce
 
0.262
Pr 
 
0.019
Nd
 
0.038
Sm
 
0.002
Gd
 
0.001
 Er
 
0.001
)(Al
 
1.816
Mg
 
0.622
Fe
2+
0.244
Fe
3+
0.159
Cr
 
0.148
Ti
 
0.030
Sc
 
0.002
V
 
0.008
Ga
 
0.001
Ni
 
0.010
Zn
 
0.015
)(Si
 
2.970
Al
 
0.022
P
 
0.008
)O
 
11.991
F
 
0.009
(OH)
Common Impurities:Cr,Fe,Th,Ti
Relationship of Dissakisite-(La) to other Species
Related Minerals - Nickel-Strunz Grouping):
9.BG.05Allanite-(Ce)
{CaCe}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Allanite-(La)
{CaLa}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Allanite-(Y)
{CaY}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Clinozoisite
{Ca
 
2
}{Al
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Dissakisite-(Ce)
{CaCe}{Al
 
2
Mg}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Dollaseite-(Ce)
{CaCe}{MgAlMg}[F|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Epidote
{Ca
 
2
}{Al
 
2
Fe
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Epidote-(Pb)
{CaPb}{Al
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Khristovite-(Ce)
{CaCe}{MgAlMn
2+
 
}[F|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Mukhinite
{Ca
 
2
}{Al
 
2
V
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Piemontite
{Ca
 
2
}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Piemontite-(Sr)
{CaSr}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Manganiandrosite-(La)
{LaMn
2+
 
}{Mn
3+
 
AlMn
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Tawmawite
Ca
 
2
(Al,Fe
3+
 
,Cr)
 
3
[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Manganipiemontite-(Sr)
{CaSr}{Mn
3+
 
AlMn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Ferriallanite-(Ce)
{CaCe}{Fe
3+
 
AlFe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Clinozoisite-(Sr)
CaSrAl
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Ferriepidote
9.BG.05Manganiandrosite-(Ce)
(Mn
2+
 
,Ca)(Ce,REE)AlMn
3+
 
Mn
2+
 
(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.05Vanadoandrosite-(Ce)
{Mn
2+
 
Ce}{V
3+
 
AlMn
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05Androsite-(La)
9.BG.05Uedaite-(Ce)
{Mn
2+
 
Ce}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.05IMA2006-055
CaSrAl
 
2
Fe
3+
 
(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
9.BG.10Zoisite
{Ca
 
2
}{Al
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.15Macfallite
Ca
 
2
(Mn
3+
 
,Al)
 
3
[(OH)
 
3
|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.15Sursassite
Mn
 
2
Al
 
3
[(OH)
 
3
|SiO
 
4
|Si
 
2
O
 
7
]
9.BG.20Julgoldite-(Fe2+)
Ca
 
2
(Fe
2+
 
,Mg)(Fe
3+
 
,Al)
 
2
[(OH)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
9.BG.20Okhotskite
Ca
 
8
(Mn,Mg)
 
4
(Mn,Al,Fe)
 
8
Si
 
12
O
 
56-n
(OH)
 
n
9.BG.20Pumpellyite-(Fe2+)
Ca
 
2
Fe
2+
 
Al
 
2
[(OH)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
9.BG.20Pumpellyite-(Fe3+)
Ca
 
2
(Fe
3+
 
,Mg,Fe
2+
 
)(Al,Fe
3+
 
)
 
2
[(OH,O)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
9.BG.20Pumpellyite-(Mg)
Ca
 
2
MgAl
 
2
[(OH)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
9.BG.20Pumpellyite-(Mn2+)
Ca
 
2
(Mn
2+
 
,Mg)(Al,Mn
3+
 
,Fe
3+
 
)
 
2
[(OH)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
9.BG.20Shuiskite
Ca
 
2
(Mg,Al)(Cr,Al)
 
2
[(OH)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · 2H
 
2
O
9.BG.20Julgoldite-(Fe3+)
Ca
 
2
(Fe
3+
 
,Mg)(Fe
3+
 
,Al)
 
2
[(OH,O)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
9.BG.20Pumpellyite-(Al)
Ca
 
2
(Al,Fe
2+
 
,Mg)Al
 
2
[(OH,O)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
9.BG.20Poppiite
Ca
 
2
(V
3+
 
,Fe
3+
 
,Mg)(V
3+
 
,Al)
 
2
[(OH,O)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
9.BG.20Julgoldite-(Mg)
Ca
 
2
(Mg,Fe
2+
 
)(Fe
3+
 
,Al)
 
2
[(OH)
 
2
|SiO
 
4
|Si
 
2
O
 
7
] · H
 
2
O
9.BG.25Ganomalite
Pb
 
9
Ca
 
5
Mn[O|SiO
 
4
|(Si
 
2
O
 
7
)
 
4
]
9.BG.30Rustumite
Ca
 
10
(Si
 
2
O
 
7
)
 
2
(SiO
 
4
)Cl
 
2
(OH)
 
2
9.BG.35Vesuvianite
Ca
 
10
(Mg,Fe)
 
2
Al
 
4
Si
 
9
O
 
34
(OH)
 
4
9.BG.35Wiluite
Ca
 
19
(Al,Mg,Fe,Ti)
 
13
(B,Al,[ ])
 
5
Si
 
18
O
 
68
(O,OH)
 
10
9.BG.35Manganvesuvianite
Ca
 
19
Mn(Al,Mn,Fe)
 
19
(Mg,Mn)
 
2
Si
 
18
O
 
69
(OH)
 
9
9.BG.35Fluorvesuvianite
Ca
 
19
(Al,Mg,Fe
2+
 
)
 
13
[(F,OH,O)
 
10
|(SiO
 
4
)
 
10
|(Si
 
2
O
 
7
)
 
4
]
9.BG.40Vyuntspakhkite-(Y)
Y
 
4
Al
 
3
Si
 
5
O
 
18
(OH)
 
5
9.BG.45Dellaite
Ca
 
6
Si
 
3
O
 
11
(OH)
 
2
9.BG.50Gatelite-(Ce)
CaCe
 
3
Al
 
2
(Al,Mg)(Mg,Fe
2+
 
,Al)[(O,F)|(OH,O)
 
2
|(SiO
 
4
)
 
3
|Si
 
2
O
 
7
]
9.BG.55Västmanlandite-(Ce)
Ca(Ce,La)
 
3
Al
 
2
Mg
 
2
 [F|(OH)
 
2
|(SiO
 
4
)
 
3
|Si
 
2
O
 
7
]
Other Names for Dissakisite-(La)
Synonyms:
IMA2003-007
Russian names:
Диссакисит-(La)
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 Dissakisite-(La)
Reference List:Tumiati, S., Godard, G., Martin, S., Nimis, P. (2005): Dissakisite-(La), a new end-member of the epidote group from the Ulten peridotites (Italian Eastern Alps): Evidence of mantle-crust interactions in subduction zones. Geophysical Research Abstracts, 7, 00616.



Tumiati, S., Godard, G., Martin, S., Nimis, P., Mair, V., Boyer, B. (2005): Dissakisite-(La) from the Ulten zone peridotite (Italian Eastern Alps): A new end-member of the epidote group. American Mineralogist, 90, 1177-1185.



Lavina, B., Carbonin, S., Russo, U., Tumiati, S. (2006): The crystal structure of dissakisite-(La), a new member of the epidote group, and its structural variations after annealing of radiation damage. American Mineralogist, 91, 104-110.



Tumiati, S., Carbonin, S., Mair, V., Russo, U. (2006): Dissakisite-(La). Nuova specie dalla Val d'Ultimo, Alto Adige. Rivista Mineralogica Italiana, 30(4), 244-247.
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    Localities for Dissakisite-(La)
    
	






    


    

    
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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.

    Italy
     
    

    • Trentino-Alto Adige
    

      • Bolzano Province (South Tyrol)
    

        • Ultimo Valley (Ulten Valley)
    
    		Am Min 90:1177-1185
    Russia
     
    

    • Urals Region
    

      • Chelyabinsk Oblast'
    

        • Kyshtym (Kychtym; Kishtim)
    
    		P.M. Kartashov data
    

    


    

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