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Tiragalloite

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Molinello Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy
© Thomas Witzke

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Formula:
Mn
 
4
AsSi
 
3
O
 
12
(OH)
System:MonoclinicColour:Orange
Name:Named after Paolo Tiragallo (b. 1905), Liguria (Italy), distinguished amateur mineralogist.
This page provides mineralogical data about Tiragalloite.

Classification of Tiragalloite

IMA status:Approved 1969
Strunz 8th edition ID:8/F.24-12
Nickel-Strunz 10th (pending) edition ID:9.BJ.25

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
Dana 8th edition ID:57.2.1.1

57 : SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
2 : Insular Si3O10 and Larger Noncyclic Groups with [Si4O13] groups
Hey's CIM Ref.:17.7.7

17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate
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Type Occurrence of Tiragalloite

Type Locality:Molinello Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy
Year of Discovery:1980

Physical Properties of Tiragalloite

Lustre:Sub-Adamantine, Dull
Colour:Orange

Crystallography of Tiragalloite

Crystal System:Monoclinic
Cell Parameters:a = 6.66Å, b = 19.92Å, c = 7.67Å
β = 95.71°
Ratio:a:b:c = 0.334 : 1 : 0.385
Unit Cell Volume:V 1,012.51 ų (Calculated from Unit Cell)

Optical Data of Tiragalloite

Type:Biaxial (+)
RI values: nα = 1.745 nβ = 1.751 nγ = 1.760
2V:Measured: 38° to 46°, Calculated: 80°
Maximum Birefringence:δ = 0.015

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:strong

Chemical Properties of Tiragalloite

Formula:
Mn
 
4
AsSi
 
3
O
 
12
(OH)
Essential elements:As, H, Mn, O, Si
All elements listed in formula:As, H, Mn, O, Si
Common Impurities:Ti,Al,V,Fe,Ca,Na,K

Relationship of Tiragalloite 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.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
9.BJ.65Cassagnaite
(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
]
Related Minerals - Hey's Index Grouping:
17.7.1Suzukiite
BaVSi
 
2
O
 
7
17.7.2Franciscanite
Mn
3+
6
V
5+
0.5
[(O,OH)
 
3
|SiO
 
4
]
17.7.3Kurumsakite
(Zn,Ni,Cu)
 
8
Al
 
8
V
 
2
Si
 
5
O
 
35
·27H
 
2
O (or near)
17.7.4Ardennite-(As)
Mn
2+
4
[(Al,Mg)
 
6
][(OH)
 
6
|(AsO
 
4
,VO
 
4
)|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
17.7.5Medaite
(Mn,Ca)
 
6
(V,As)Si
 
5
O
 
18
OH
17.7.6Johninnesite
Na
 
2
Mg
 
5
Mn
 
12
As
 
2
Si
 
12
O
 
43
(OH)
 
6
17.7.8Dixenite
CuMn
2+
14
Fe
2+
 
[(OH)
 
6
|(AsO
 
3
)
 
5
|AsO
 
4
|(SiO
 
4
)
 
2
]
17.7.9Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
[(AsO
 
3
)
 
3
|SiO
 
4
]
 
2
17.7.10Mcgovernite
(Mn,Mg,Zn)
 
273
As
3+
~12
As
5+
~30
Si
 
~42
O
 
324
(OH)
 
252
17.7.11Kraisslite
(Mn
2+
 
,Mg)
 
24
Zn
 
4
[(OH)
 
12
|(AsO
 
4
)
 
4
|(SiO
 
4
)
 
8
]
17.7.12Schallerite
(Mn,Fe)
 
16
Si
 
12
As
 
3
O
 
36
(OH)
 
17
17.7.13Nelenite
(Mn,Fe)
 
16
Si
 
12
As
 
3
O
 
36
(OH)
 
17
17.7.14Kolicite
Mn
2+
7
Zn
 
4
[(OH)
 
8
|(AsO
 
4
)
 
2
|(SiO
 
4
)
 
2
]
17.7.15Yeatmanite
Mn
2+
7
Zn
 
8
Sb
5+
2
[O
 
3
|SiO
 
4
]
 
4
17.7.16Welshite
Ca
 
4
Mg
 
9
Sb
 
3
O
 
4
[Si
 
6
Be
 
3
AlFe
 
2
O
 
36
]
17.7.17Katoptrite
(Mn
2+
 
,Mg)
 
13
(Al,Fe
3+
 
)
 
4
Sb
5+
2
[O
 
10
|SiO
 
4
]
 
2
17.7.18Parwelite
(Mn,Mg,Ca)
 
5
Sb(As,Si)
 
2
O
 
12
17.7.19Långbanite
(Mn
2+
 
,Ca)
 
4
(Mn
3+
 
,Fe
3+
 
)
 
9
Sb
5+
 
[O
 
8
|SiO
 
4
]
 
2
17.7.20Chapmanite
Fe
3+
2
Sb
3+
 
[OH|(SiO
 
4
)
 
2
]
17.7.21Cervandonite-(Ce)
(Ce,Nd,La)(Fe,Ti,Al)
 
3
SiAs(Si,As)O
 
13

Other Names for Tiragalloite

Synonyms:
IMA1969-061
German names:
Tiragalloit
Russian names:
Тирагаллоит
Spanish names:
Tiragalloita

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 Tiragalloite

Reference List:Rendiconti Società Italiana di Mineralogia e Petrologia (1979): 35: 145-149.

Gramaccioli, C. M., Griffin, W. L. & Mottana, A. (1980): Tiragalloite, Mn4[AsSi3O12(OH)], a new mineral and the first example of arsenatotrisilicate. American Mineralogist 65, 947-952.

Gramaccioli, C. M., Pilati, T. & Liborio, G. (1979): Structure of manganese(II) arsenatotrisilicate, Mn4[AsSi3O12(OH)]: the presence of a new tetrapolyphosphate-like anion. Acta Crystallographica, B35, 2287-2291.

Internet Links for Tiragalloite

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    Localities for Tiragalloite

    (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
     
    • Aosta Valley
      • Saint-Marcel
    		Cenki-Tok, B. & Chopin, C. (2006): Coexisting calderite and spessartine garnets in eclogite-facies metacherts of the Western Alps. Mineralogy and Petrology, 88, 47-68.
    • Liguria
      • Genova Province
        • Ne
          • Graveglia Valley
    		Redazionale (2005): Sistematica ligure: resoconto 2005. Notiziario di Mineralogia del Ferrania Club, 19 , 3-5.
    [Rend.Soc.It.Min.Petrol.(1979) 35, 145-149; MinRec 32:355]
            • Reppia
    		Rivista Mineralogica Italiana, (4), 131
    • Lombardy
      • Sondrio Province
    		Lapis, 19 (10), 15-21+86.
    • Piedmont
      • Torino Province
        • Susa Valley
          • Salbertrand
    		Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
    Japan
     
    • Nansei Archipelago
      • Kagoshima Prefecture
        • Amami-Oshima Island
    		Fujiwara, et al. (2005) Kobutsu-Gakkai Koen-Yoshi, 149.
    Switzerland
     
    • Grischun (Grisons; Graubünden)
      • Hinterrhein Valley
        • Ferrera Valley
          • Ausserferrera
    		J. Brugger et al.: Am. Min. 91:937-943(2006)
        • Rheinwald
          • Splügen
    		Stalder, H. A., Wagner, A., Graeser, S. und Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf Verlag, Basel, 579 pp.
    Mineral and/or Locality
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