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Cassagnaite

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Cassagna Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy
© Knut Eldjarn

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Formula:
(Ca,Mn
2+
 
)
 
4
(Fe
3+
 
,Mn
3+
 
,Al)
 
4
(V
3+
 
,Mg,Al)
 
2
[(O,OH)
 
4
|(OH)
 
4
|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
System:Orthorhombic
Name:After the type locality, the Cassagna Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy.
This page provides mineralogical data about Cassagnaite.

Classification of Cassagnaite

IMA status:Approved 2007
Nickel-Strunz 10th (pending) edition ID:9.BJ.65

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
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Type Occurrence of Cassagnaite

Type Locality:Cassagna Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy

Crystallography of Cassagnaite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Cmcm (C2/m 2/c 21/m)
Cell Parameters:a = 6.066Å, b = 8.908Å, c = 18.995Å
Ratio:a:b:c = 0.681 : 1 : 2.132
Unit Cell Volume:V 1,026.41 ų (Calculated from Unit Cell)

Chemical Properties of Cassagnaite

Formula:
(Ca,Mn
2+
 
)
 
4
(Fe
3+
 
,Mn
3+
 
,Al)
 
4
(V
3+
 
,Mg,Al)
 
2
[(O,OH)
 
4
|(OH)
 
4
|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
Essential elements:
All elements listed in formula:Al, Ca, Fe, H, Mg, Mn, O, Si, V

Relationship of Cassagnaite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.BJ.05Orientite
Ca
 
2
MnMn
 
2
Si
 
3
O
 
10
(OH)
 
4
9.BJ.10Rosenhahnite
HCa
 
3
[Si
 
3
O
 
9
(OH)]
9.BJ.15Trabzonite
Ca
 
4
Si
 
3
O
 
10
·2H
 
2
O
9.BJ.20Thalénite-(Y)
Y
 
3
Si
 
3
O
 
10
(OH)
9.BJ.20Fluorthalénite-(Y)
Y
 
3
Si
 
3
O
 
10
F
9.BJ.25Tiragalloite
Mn
 
4
AsSi
 
3
O
 
12
(OH)
9.BJ.30Medaite
(Mn,Ca)
 
6
(V,As)Si
 
5
O
 
18
OH
9.BJ.35Ruizite
Ca
 
2
Mn
3+
2
[(OH)
 
2
|H
 
2
Si
 
4
O
 
13
] · 2H
 
2
O
9.BJ.40Ardennite-(As)
Mn
2+
4
[(Al,Mg)
 
6
][(OH)
 
6
|(AsO
 
4
,VO
 
4
)|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
9.BJ.40Ardennite-(V)
Mn
2+
4
[Al
 
4
(Mg,Al,Fe
3+
 
,Mn
3+
 
)
 
2
][(OH)
 
6
|(VO
 
4
,SiO
 
4
)|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
9.BJ.45Kilchoanite
Ca
 
3
Si
 
2
O
 
7
9.BJ.50Kornerupine
Mg
 
3
Al
 
6
(Si,Al,B)
 
5
O
 
21
(OH)
9.BJ.50Prismatine
([ ],Fe,Mg)(Mg,Al,Fe)
 
5
Al
 
4
Si
 
2
(Si,Al)
 
2
(B,Si,Al)(O,OH,F)
 
22
9.BJ.55Zunyite
Al
 
13
Si
 
5
O
 
20
(OH,F)
 
18
Cl
9.BJ.60Hubeite
Ca
 
2
Mn
2+
 
Fe
3+
 
[HSi
 
4
O
 
13
] · 2H
 
2
O

Other Names for Cassagnaite

Synonyms:
IMA 2006-019a

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 Cassagnaite

Reference List:Basso Ricardo, Carbone Cristina, Palenzona Andrea (2007) "Cassagnaite, a new mineral from Cassagna mine, Northern Apennines, Italy." GeoItalia September 2007.

Internet Links for Cassagnaite

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    Localities for Cassagnaite

    (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
     
    • Liguria
      • Genova Province
        • Ne
          • Graveglia Valley
    		Basso Ricardo, Carbone Cristina, Palenzona Andrea (2007) "Cassagnaite, a new mineral from Cassagna mine, Northern Apennines, Italy." GeoItalia September 2007.
    Mineral and/or Locality
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