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Stoppaniite

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Capranica, Vico Lake, Viterbo Province, Latium, Italy
© D. Preite

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Formula:
Be
 
3
Fe
3+
2
(Si
 
6
O
 
18
) · H
 
2
O
System:HexagonalColour:Light blue
Lustre:VitreousHardness:7½
Member of:Beryl Group
Name:Named after Francesco Saverio Stoppani (b. 1947), lawyer from Rome (Italy), collector of minerals and coauthor of "I minerali del Lazio (1982)".
Isostructural with:Beryl


Found in miarolitic cavities in syenite ejecta in pyroclastic breccia, Capranica, Viterbo.

Classification of Stoppaniite

IMA status:Approved 1996
Strunz 8th edition ID:8/E.12-25
Nickel-Strunz 10th (pending) edition ID:9.CJ.05

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
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Type Occurrence of Stoppaniite

Type Locality:Capranica, Vico Lake, Viterbo Province, Latium, Italy

Physical Properties of Stoppaniite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Light blue
Hardness (Mohs):7½

Crystallography of Stoppaniite

Crystal System:Hexagonal
Class (H-M):6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:P6/mcc {P6/m 2/c 2/c}
Cell Parameters:a = 9.346Å, c = 9.213Å
Ratio:a:c = 1 : 0.986
Unit Cell Volume:V 696.92 ų
Z:1

Optical Data of Stoppaniite

Type:Uniaxial (-)
RI values: nω = 1.625 nε = 1.619
Maximum Birefringence:δ = 0.006

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

Chemical Properties of Stoppaniite

Formula:
Be
 
3
Fe
3+
2
(Si
 
6
O
 
18
) · H
 
2
O
Essential elements:Be, Fe, H, O, Si
All elements listed in formula:Be, Fe, H, O, Si

Relationship of Stoppaniite to other Species

Member of:Beryl Group
Other Members of Group:

- +
Bazzite
Be
 
3
Sc
 
2
(Si
 
6
O
 
18
)
Beryl
Be
 
3
Al
 
2
(Si
 
6
O
 
18
)
Pezzottaite
Cs(Be
 
2
Li)Al
 
2
(Si
 
6
O
 
18
)
Related Minerals - Nickel-Strunz Grouping):

- +
9.CJ.05Bazzite
Be
 
3
Sc
 
2
(Si
 
6
O
 
18
)
9.CJ.05Beryl
Be
 
3
Al
 
2
(Si
 
6
O
 
18
)
9.CJ.05Indialite
Mg
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
9.CJ.10Cordierite
(Mg,Fe)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
9.CJ.10Sekaninaite
(Fe,Mg)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
9.CJ.15aCombeite
Na
 
2
Ca
 
2
(Si
 
6
O
 
18
)
 
0.5
9.CJ.15bImandrite
Na
 
12
Ca
 
3
Fe
3+
2
(Si
 
6
O
 
18
)
 
2
9.CJ.15aKazakovite
Na
 
6
Mn
2+
 
Ti(Si
 
6
O
 
18
)
9.CJ.15cKoashvite
Na
 
6
(Ca,Mn)(Ti,Fe)Si
 
6
O
 
18
 · H
 
2
O
9.CJ.15aLovozerite
Na
 
2
CaZr(H
 
4
Si
 
6
O
 
18
) · H
 
2
O
9.CJ.15aTisinalite
Na
 
3
H
 
3
(Mn,Ca,Fe)TiSi
 
6
(O,OH)
 
18
 · 2H
 
2
O
9.CJ.15aZirsinalite
Na
 
6
(Ca,Mn
2+
 
,Fe
2+
 
)Zr(Si
 
6
O
 
18
)
9.CJ.15aLitvinskite
Na
 
2
(◻,Na,Mn)ZrSi
 
6
O
 
12
(OH,O)
 
6
9.CJ.15aKapustinite
Na
 
5
(Na,Mn
2+
 
)
 
<1
Zr(H
 
2
Si
 
6
O
 
18
)
9.CJ.25Baratovite
KCa
 
7
(Ti,Zr)
 
2
Li
 
3
Si
 
12
O
 
36
F
 
2
9.CJ.25Katayamalite
KCa
 
7
Ti
 
2
Li
 
3
Si
 
12
O
 
36
(OH)
 
2
9.CJ.25Aleksandrovite
KCa
 
7
Sn
 
2
Li
 
3
Si
 
12
O
 
36
F
 
2
9.CJ.30Dioptase
CuSiO
 
3
 · H
 
2
O
9.CJ.35Kostylevite
K
 
2
Zr(Si
 
3
O
 
9
) · H
 
2
O
9.CJ.40Petarasite
Na
 
5
Zr
 
2
(Si
 
6
O
 
18
)(Cl,OH) · 2H
 
2
O
9.CJ.45Gerenite-(Y)
(Ca,Na)
 
2
(Y,REE)
 
3
Si
 
6
O
 
18
 · 2H
 
2
O
9.CJ.50Odintsovite
K
 
2
Na
 
4
Ca
 
3
Ti
 
2
Be
 
4
Si
 
12
O
 
38
9.CJ.55Mathewrogersite
Pb
 
7
FeAl
 
3
GeSi
 
12
O
 
36
(OH,H
 
2
O)
 
6
9.CJ.60Pezzottaite
Cs(Be
 
2
Li)Al
 
2
(Si
 
6
O
 
18
)

Other Names for Stoppaniite

Synonyms:
IMA1996-008
Other Languages:
German:Stoppaniit
Russian:Стоппаниит
Spanish:Stoppaniita

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 Stoppaniite

Reference List:

- +
European Journal of Mineralogy (1998): 10: 491-496.

European Journal of Mineralogy (2000): 12: 121-127.

Terra Abstracts: 8: 21.

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    • Localities for Stoppaniite

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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
     
    • Latium
      • Viterbo Province
        • Vico Lake
    		Eur.J.Min.(1998) 10, 491-496; Eur.J.Min. 12 (2000), 121; Am Min 85 (2000), 1845; Min Rec 32/3 (2001), 221
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