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Capranicaite

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About CapranicaiteHide

Formula:
KCaNaAl4B4Si2O18
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
2.41 (Calculated)
Crystal System:
Monoclinic
Name:
Named after the type locality, in the Vico volcanic complex at Capranica, Viterbo, Italy.
This page provides mineralogical data about Capranicaite.


Classification of CapranicaiteHide

Approved
Approval Year:
2010
9.DB.50

9 : SILICATES (Germanates)
D : Inosilicates
B : Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
65.1.12.

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2

Physical Properties of CapranicaiteHide

Vitreous
Colour:
Colourless
Streak:
White
Comment:
Its hardness should be less than that of sanidine (<6 on the Mohs scale).
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {001}
Fracture:
Splintery
Density:
2.41 g/cm3 (Calculated)

Optical Data of CapranicaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.495(1) nβ = 1.543(1) nγ = 1.544(1)
2V:
Measured: 7.3° (2), Calculated: 16.0°
Birefringence:
0.049
Max Birefringence:
δ = 0.049
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of CapranicaiteHide

Formula:
KCaNaAl4B4Si2O18

Crystallography of CapranicaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 4.8507(2) Å, b = 16.6156(2) Å, c = 20.5445(7) Å
β = 90.245(1)°
Ratio:
a:b:c = 0.292 : 1 : 1.236
Unit Cell V:
1655.82 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.104 (90)
3.424 (83)
3.234 (100)
3.119 (32)
2.425 (31)
2.405 (37)
2.184 (38)
1.564 (30)

Type Occurrence of CapranicaiteHide

General Appearance of Type Material:
Thin, tabular crystals no larger than 0.1 mm.
Place of Conservation of Type Material:
Mineralogical Museum of Rome University "La Sapienza" (Italy), specimen number MMUR 33036/1.
Geological Setting of Type Material:
It occurs in miarolitic cavities of a feldspathoid-bearing syenite ejectum and formed by late-stage metasomatic processes related to the activity of the Vico volcano.

Synonyms of CapranicaiteHide

Related Minerals - Nickel-Strunz GroupingHide

9.DB.05BalipholiteBaLiMg2Al3(Si2O6)2(OH)4Orth.
9.DB.05CarpholiteMn2+Al2(Si2O6)(OH)4Orth.
9.DB.05Ferrocarpholite(Fe2+,Mg)Al2(Si2O6)(OH)4Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.05Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4Orth.
9.DB.05Potassiccarpholite(K,☐)(Li,Mn2+)2Al4(Si2O6)2(OH,F)8Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.05VanadiocarpholiteMn2+V3+Al(Si2O6)(OH)4Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.10LorenzeniteNa2Ti2(Si2O6)O3Orth. mmm (2/m 2/m 2/m) : Pbcn
9.DB.15LintisiteLiNa3Ti2(Si2O6)2O2 · 2H2OMon.
9.DB.15PunkaruaiviteLiTi2(HSi4O12)(OH)2 · H2OMon. 2/m : B2/b
9.DB.17EliseeviteLiNa1.5Ti2(H1.5Si4O12)O2 · 2H2OMon. 2/m : B2/b
9.DB.20KukisvumiteNa6ZnTi4(Si8O24)O4 · 4H2OOrth.
9.DB.20ManganokukisvumiteNa6MnTi4(Si8O24)O4 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pccn
9.DB.25VinogradoviteNa4Ti4(Si2O6)2[(Si,Al)4O10]O4 · (H2O,Na,K)3Mon. 2/m : B2/b
9.DB.25ParavinogradoviteNa1-2(Ti,Fe3+)4(Si2O6)2(AlSi3O10)(OH)4 · H2OTric. 1 : P1
9.DB.30NchwaningiteMn2+2(SiO3)(OH)2 · H2OOrth.
9.DB.35PlancheiteCu8(Si8O22)(OH)4 · H2OOrth. mmm (2/m 2/m 2/m)
9.DB.40ShattuckiteCu5(Si2O6)2(OH)2Orth. mmm (2/m 2/m 2/m)
9.DB.40UM2005-31-SiO:CuHCu11(SiO4)(OH)18 · 9H2O ?
9.DB.45Aerinite(Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO3)1.2(H2O)12]Mon.

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 CapranicaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Callegari, A. M. et al. (2010): Capranicaite: a new mineral from Capranica, Viterbo, Italy. 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts, p. 495.
Callegari, A.M., Boiocchi, M., Bellatreccia, F., Caprilli, E., Medenbach, O. & Cavallo, A. (2011): Capranicaite, (K,◻)(Ca,Na)Al4B4Si2O18: a new inosilicate from Capranica, Italy, with a peculiar topology of the periodic single chain [Si2O6]. Mineralogical Magazine, 75, 33-43.

Internet Links for CapranicaiteHide

Localities for CapranicaiteHide

ⓘ - 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)
• IMA Approvals - Feb. 2010 • Bellatreccia, F., L., Boiocchi, M., Callegari, A.M., Caprilli, E., Cavallo, A., Medenbach, O. (2010): La capranicaite, KCaNaAl4B4Si2O18 un nuovo minerale da Capranica (VT). Il Cercapietre. Not. del Gruppo Mineralogico Romano, 1-2: 6-12
Mineral and/or Locality  
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