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Stoppaniite

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About StoppaniiteHide

Formula:
Be3Fe3+2(Si6O18) · H2O
The formula is simplified; the real formula is very complex (Della Ventura et al., 2000).
Colour:
Light blue
Lustre:
Vitreous
Hardness:
Crystal System:
Hexagonal
Member of:
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:
Found in miarolitic cavities in syenite ejecta in pyroclastic breccia, Capranica, Viterbo.


Classification of StoppaniiteHide

Approved
Approval Year:
1996
9.CJ.05

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

Physical Properties of StoppaniiteHide

Vitreous
Transparency:
Transparent
Colour:
Light blue
Hardness:
7½ on Mohs scale

Optical Data of StoppaniiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.625 nε = 1.619
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of StoppaniiteHide

Formula:
Be3Fe3+2(Si6O18) · H2O

The formula is simplified; the real formula is very complex (Della Ventura et al., 2000).
IMA Formula:
Fe3+2Be3Si6O18 · H2O

Crystallography of StoppaniiteHide

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

Type Occurrence of StoppaniiteHide

Synonyms of StoppaniiteHide

Other Language Names for StoppaniiteHide

Relationship of Stoppaniite to other SpeciesHide

Member of:
Other Members of this group:
BazziteBe3Sc2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
PezzottaiteCs(Be2Li)Al2(Si6O18)Trig. 3 : R3

Related Minerals - Nickel-Strunz GroupingHide

9.CJ.05BazziteBe3Sc2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05IndialiteMg2Al3(AlSi5O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.10Cordierite(Mg,Fe)2Al3(AlSi5O18)Orth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.10Sekaninaite(Fe,Mg)2Al3(AlSi5O18)Orth.
9.CJ.15aCombeiteNa4.5Ca3.5Si6O17.5(OH)0.5Trig. 3m (3 2/m) : R3m
9.CJ.15bImandriteNa12Ca3Fe3+2(Si6O18)2Orth.
9.CJ.15aKazakoviteNa6Mn2+Ti(Si6O18)Trig.
9.CJ.15cKoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2OOrth.
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2OTrig.
9.CJ.15aZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)Trig.
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6Mon. m : Bm
9.CJ.15aKapustiniteNa5(Na,Mn2+)<1Zr(H2Si6O18)Mon. 2/m
9.CJ.25BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2Mon. 2/m : B2/b
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2Mon. 2/m : B2/b
9.CJ.25AleksandroviteKCa7Sn2Li3Si12O36F2Mon. 2/m : B2/b
9.CJ.30DioptaseCuSiO3 · H2OTrig. 3 : R3
9.CJ.35KostyleviteK2Zr(Si3O9) · H2OMon.
9.CJ.40PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
9.CJ.45Gerenite-(Y)(Ca,Na)2(Y,REE)3Si6O18 · 2H2OTric.
9.CJ.50OdintsoviteK2Na4Ca3Ti2Be4Si12O38Orth.
9.CJ.55MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6Trig.
9.CJ.60PezzottaiteCs(Be2Li)Al2(Si6O18)Trig. 3 : R3

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for StoppaniiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ferraris, G., Prencipe, M., Rossi, P. (1998): Stoppaniite, a new member of the beryl group: crystal structure and crystal-chemical implications. European Journal of Mineralogy 10, 491-496.
Della Ventura, G., Rossi, P., Parodi, G.C., Mottana, A., Raudsepp, M., Prencipe, M. (2000): Stoppaniite, (Fe,Al,Mg)4(Be6Si12O36)*(H2O)2(Na,◻) a new mineral of the beryl group from Latium (Italy). European Journal of Mineralogy 12, 121-127.
Terra Abstracts: 8: 21.

Internet Links for StoppaniiteHide

Localities for StoppaniiteHide

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Latium
    • Viterbo Province
      • Vico volcanic complex (Vico Lake)
European Journal of Mineralogy(1998) 10, 491-496; European Journal of Mineralogy 12 (2000), 121; Am Min 85 (2000), 1845; Min Rec 32/3 (2001), 221
No reference listed
Mineral and/or Locality  
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