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Capranicaite

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Formula:
KCaNaAl4B4Si2O18
System:
Monoclinic
Colour:
Colourless
Name:
Named after the type locality, in the Vico volcanic complex at Capranica, Viterbo, Italy.
This page provides mineralogical data about Capranicaite.

Classification of Capranicaite

Approved 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
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Type Occurrence of Capranicaite

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.

Physical Properties of Capranicaite

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)

Crystallography of Capranicaite

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 Volume:
V 1655.82 ų
Z:
4
X-Ray 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)

Optical Data of Capranicaite

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 Capranicaite

Formula:
KCaNaAl4B4Si2O18
Essential elements:
All elements listed in formula:
Analytical Data:
Average of 4 electron microprobe analyses.
SiO2 (20.70)
Al2O3 (32.91)
B2O3 (22.90)
K2O (5.36)
CaO (11.04)
Na2O (4.08)
Cs2O (2.20)
Total (99.19)
Empirical Formula:
(K0.69Cs0.10)(Ca1.19Na0.80)Al3.91B3.99Si2.09O18

Relationship of Capranicaite to other Species

9.DB.05BalipholiteBaLiMg2Al3(Si2O6)2(OH)4
9.DB.05CarpholiteMn2+Al2(Si2O6)(OH)4
9.DB.05Ferrocarpholite(Fe2+,Mg)Al2(Si2O6)(OH)4
9.DB.05Magnesiocarpholite(Mg,Fe2+)Al2(Si2O6)(OH)4
9.DB.05Potassiccarpholite(K,☐)(Li,Mn2+)2Al4(Si2O6)2(OH,F)8
9.DB.05VanadiocarpholiteMn2+V3+Al(Si2O6)(OH)4
9.DB.10LorenzeniteNa2Ti2(Si2O6)O3
9.DB.15LintisiteLiNa3Ti2(Si2O6)2O2 · 2H2O
9.DB.15PunkaruaiviteLiTi2(HSi4O12)(OH)2 · H2O
9.DB.17EliseeviteLiNa1.5Ti2(H1.5Si4O12)O2 · 2H2O
9.DB.20KukisvumiteNa6ZnTi4(Si8O24)O4 · 4H2O
9.DB.20ManganokukisvumiteNa6MnTi4(Si8O24)O4 · 4H2O
9.DB.25Vinogradovite(Na,Ca,K)4Ti4AlSi6O23(OH) · 2H2O
9.DB.25ParavinogradoviteNa1-2(Ti,Fe3+)4(Si2O6)2(AlSi3O10)(OH)4 · H2O
9.DB.30NchwaningiteMn22+(SiO3)(OH)2 · H2O
9.DB.35PlancheiteCu8(Si8O22)(OH)4 · H2O
9.DB.40ShattuckiteCu5(Si2O6)2(OH)2
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]

Other Names for Capranicaite

Name in Other Languages:

Other Information

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 Capranicaite

Reference List:
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 Capranicaite

Localities for Capranicaite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • Latium
    • Viterbo Province
      • 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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