Gridone - Monte Limidario area, Centovalli, Locarno, Ticino, Switzerland i
Regional Level Types
Gridone - Monte Limidario area Mountain Area
Centovalli Municipality
Locarno District
Ticino Canton
Switzerland Country

Zircon-bearing nepheline-pegmatites (sic!) in gabbro and peridotites of the Finero ultra-mafic complex, Ivrea-Verbano zone.

Located in a steep area in Val di Capolo, northern flank of Gridone Massif, these miaskite pegmatites are grouped as follows:
- the lower pegmatite area no. 1 (also known as Felice pegmatite), including the uppermost zircon-bearing nepheline-free pegmatite no. 1a, the intermediate zircon-bearing nepheline-pegmatite no. 1b, and the lowermost zircon-free nepheline-pegmatite no. 1c;
- the upper large pegmatite no. 2 (also known as Sant'Anna pegmatite), located 200 m east of the former.

Zircon crystals from here may reach up to about 9 cm (!). They strongly fluoresce yellow to orange-yellow under short-wave ultraviolet light.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

20 valid minerals.

Detailed Mineral List:

ⓘ Albite

Formula: Na(AlSi₃O₈)

References:

Weiβ, S., Fehr, T., Ansermet, S., Meisser, N., Pakhomovsky, Ya.K. (2007): Zirkonführende Nephelin-Pegmatite im Centovalli, Süd-Schweiz: Struktur, Mineralogie und Kristallisationsfolge. Lapis, 32, 6, 24-30.

ⓘ Annite

Formula: KFe²⁺₃(AlSi₃O₁₀)(OH)₂

References:

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

References:

ⓘ Cancrinite

Formula: (Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O

References:

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

ⓘ Columbite-(Fe)

Formula: Fe²⁺Nb₂O₆

References:

ⓘ Corundum

Formula: Al₂O₃

References:

ⓘ Euxenite-(Y)

Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆

References:

Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 156.

ⓘ Hercynite

Formula: Fe²⁺Al₂O₄

References:

ⓘ Hydroxylapatite

Formula: Ca₅(PO₄)₃(OH)

Description: Cl- and F-bearing hydroxylapatite

References:

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

ⓘ Monazite-(Ce)

Formula: Ce(PO₄)

References:

ⓘ Nepheline

Formula: Na₃K(Al₄Si₄O₁₆)

References:

ⓘ Paragonite

Formula: NaAl₂(AlSi₃O₁₀)(OH)₂

References:

ⓘ Phlogopite

Formula: KMg₃(AlSi₃O₁₀)(OH)₂

References:

ⓘ Pyrrhotite

Formula: Fe_1-xS

References:

ⓘ Siderophyllite

Formula: KFe²⁺₂Al(Al₂Si₂O₁₀)(OH)₂

References:

ⓘ Sodalite

Formula: Na₄(Si₃Al₃)O₁₂Cl

References:

ⓘ Vermiculite

Formula: Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O

References:

ⓘ Violarite

Formula: Fe²⁺Ni³⁺₂S₄

References:

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Gallery:

Zr(SiO₄)ⓘ Zircon

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Pyrrhotite	2.CC.10	Fe_1-xS
ⓘ	Violarite	2.DA.05	Fe²⁺Ni³⁺₂S₄
Group 4 - Oxides and Hydroxides
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Hercynite	4.BB.05	Fe²⁺Al₂O₄
ⓘ	Corundum	4.CB.05	Al₂O₃
ⓘ	Columbite-(Fe)	4.DB.35	Fe²⁺Nb₂O₆
ⓘ	Euxenite-(Y)	4.DG.05	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Monazite-(Ce)	8.AD.50	Ce(PO₄)
ⓘ	Hydroxylapatite	8.BN.05	Ca₅(PO₄)₃(OH)
Group 9 - Silicates
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Paragonite	9.EC.15	NaAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Annite	9.EC.20	KFe²⁺₃(AlSi₃O₁₀)(OH)₂
ⓘ	Phlogopite	9.EC.20	KMg₃(AlSi₃O₁₀)(OH)₂
ⓘ	Siderophyllite	9.EC.20	KFe²⁺₂Al(Al₂Si₂O₁₀)(OH)₂
ⓘ	Vermiculite	9.EC.50	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
ⓘ	Nepheline	9.FA.05	Na₃K(Al₄Si₄O₁₆)
ⓘ	Albite	9.FA.35	Na(AlSi₃O₈)
ⓘ	Cancrinite	9.FB.05	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
ⓘ	Sodalite	9.FB.10	Na₄(Si₃Al₃)O₁₂Cl
Unclassified
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Annite	KFe₃²⁺(AlSi₃O₁₀)(OH)₂
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
H	ⓘ Hydroxylapatite	Ca₅(PO₄)₃(OH)
H	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
H	ⓘ Siderophyllite	KFe₂²⁺Al(Al₂Si₂O₁₀)(OH)₂
H	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
C	Carbon
C	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
O	Oxygen
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Annite	KFe₃²⁺(AlSi₃O₁₀)(OH)₂
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
O	ⓘ Corundum	Al₂O₃
O	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
O	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
O	ⓘ Hercynite	Fe²⁺Al₂O₄
O	ⓘ Hydroxylapatite	Ca₅(PO₄)₃(OH)
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Monazite-(Ce)	Ce(PO₄)
O	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
O	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
O	ⓘ Siderophyllite	KFe₂²⁺Al(Al₂Si₂O₁₀)(OH)₂
O	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
O	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
O	ⓘ Zircon	Zr(SiO₄)
F	Fluorine
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Na	Sodium
Na	ⓘ Albite	Na(AlSi₃O₈)
Na	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Na	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Na	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
Na	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Mg	Magnesium
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Mg	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
Al	Aluminium
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Annite	KFe₃²⁺(AlSi₃O₁₀)(OH)₂
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Al	ⓘ Corundum	Al₂O₃
Al	ⓘ Hercynite	Fe²⁺Al₂O₄
Al	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Al	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Al	ⓘ Siderophyllite	KFe₂²⁺Al(Al₂Si₂O₁₀)(OH)₂
Al	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Al	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
Si	Silicon
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Annite	KFe₃²⁺(AlSi₃O₁₀)(OH)₂
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Si	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Si	ⓘ Paragonite	NaAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Si	ⓘ Siderophyllite	KFe₂²⁺Al(Al₂Si₂O₁₀)(OH)₂
Si	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Si	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
Si	ⓘ Zircon	Zr(SiO₄)
P	Phosphorus
P	ⓘ Hydroxylapatite	Ca₅(PO₄)₃(OH)
P	ⓘ Monazite-(Ce)	Ce(PO₄)
S	Sulfur
S	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Pyrrhotite	Fe_1-xS
S	ⓘ Violarite	Fe²⁺Ni₂³⁺S₄
Cl	Chlorine
Cl	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
K	Potassium
K	ⓘ Annite	KFe₃²⁺(AlSi₃O₁₀)(OH)₂
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
K	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
K	ⓘ Siderophyllite	KFe₂²⁺Al(Al₂Si₂O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Ca	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Ca	ⓘ Hydroxylapatite	Ca₅(PO₄)₃(OH)
Ti	Titanium
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Ti	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Fe	Iron
Fe	ⓘ Annite	KFe₃²⁺(AlSi₃O₁₀)(OH)₂
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
Fe	ⓘ Hercynite	Fe²⁺Al₂O₄
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Pyrrhotite	Fe_1-xS
Fe	ⓘ Siderophyllite	KFe₂²⁺Al(Al₂Si₂O₁₀)(OH)₂
Fe	ⓘ Vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
Fe	ⓘ Violarite	Fe²⁺Ni₂³⁺S₄
Ni	Nickel
Ni	ⓘ Violarite	Fe²⁺Ni₂³⁺S₄
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Y	Yttrium
Y	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Nb	Niobium
Nb	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Nb	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
Ce	Cerium
Ce	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Ce	ⓘ Monazite-(Ce)	Ce(PO₄)
Ta	Tantalum
Ta	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Th	Thorium
Th	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
U	Uranium
U	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆

Other Regions, Features and Areas containing this locality

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References

Girlanda, F., Antognini, M., Weiβ, S., Praeger, M. (2007): Riesenkristalle: Zirkon aus Nephelin-Pegmatiten im Peridotit Finero-Centovalli (Schweiz). Lapis, 32, 6, 13-23 + 90.

Girlanda, F., Antognini, M. (2010): Aussergewöhnliche Zirkone aus dem Centovalli. Schweizer Strahler, no. 1, 2-9 (in German/French).

Schaltegger, U., Ulianov, A., Müntener, O., Ovtcharova, M., Peytcheva, I., Vonlanthen, P., Vennemann, T., Antognini, M., Girlanda, F. (2015): Megacrystic zircon with planar fractures in miaskite-type nepheline pegmatites formed at high pressures in the lower crust (Ivrea Zone, southern Alps, Switzerland). Am. Mineral., 100, 1, 83-94.

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