Mindat Logo

Dissakisite-(La)

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
mindat.org URL:http://www.mindat.org/min-27401.html
Please feel free to link to this page.

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.

Internet Links for Dissakisite-(La)

Search Engines:
  • Look for Dissakisite-(La) on Google
  • Look for Dissakisite-(La) images on Google
  • External Links:
  • Look for Dissakisite-(La) on Webmineral
  • Look for Dissakisite-(La) on Athena Mineralogy
  • Look for Dissakisite-(La) on Wikipedia
  • Look for Dissakisite-(La) on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Dissakisite-(La) in the Natural History Museum (London) online catalogue
  • Mineral Dealers:
  • e-Rocks - Mineral Auctions and Sales
  • rare and unusual minerals mainly crystallized
  • Buy from David K Joyce minerals
  • Search for Dissakisite-(La) at Thames Valley Minerals
  • Wendel Minerals - Auktion & Shop
  • Buy Fine Minerals from mineralsweb.com
  • Lapis Mineral Magazin
  • Wright's Rock Shop - excellent mineral specimens since 1970
  • Fabre Minerals - search for Dissakisite-(La) specimens
  • Buy Minerals and Crystals from Crystalarium.com
  • Fine Minerals from Dan Weinrich Minerals
  • Wilensky Fine Minerals
  • Jobs:
  • Mining & Geology Jobs
  • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to find out how you can sponsor this page.

    Localities for Dissakisite-(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.
    These maps work faster with Firefox!
    (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
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon & Ida Ralph 1993-2008. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register.