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Capranicaite

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Formula:
KCaNaAl
 
4
B
 
4
Si
 
2
O
 
18
System:MonoclinicColour: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

IMA status:Approved 2010
Nickel-Strunz 10th (pending) edition ID:9.DB.50

9 : SILICATES (Germanates)
D : Inosilicates
B : Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
Dana 8th edition ID: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

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

Lustre: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 (calculated):2.41 g/cm3

Crystallography of Capranicaite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
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:
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
Maximum Birefringence:δ = 0.049

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

Chemical Properties of Capranicaite

Formula:
KCaNaAl
 
4
B
 
4
Si
 
2
O
 
18
Simplified for copy/paste:KCaNaAl4B4Si2O18
Essential elements:Al, B, Ca, K, Na, O, Si
All elements listed in formula:Al, B, Ca, K, Na, O, Si
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:
(K
 
0.69
Cs
 
0.10
)(Ca
 
1.19
Na
 
0.80
)Al
 
3.91
B
 
3.99
Si
 
2.09
O
 
18

Relationship of Capranicaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DB.05Balipholite
BaLiMg
 
2
Al
 
3
(Si
 
2
O
 
6
)
 
2
(OH)
 
4
9.DB.05Carpholite
Mn
2+
 
Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Magnesiocarpholite
(Mg,Fe
2+
 
)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Potassiccarpholite
(K,☐)(Li,Mn
2+
 
)
 
2
Al
 
4
(Si
 
2
O
 
6
)
 
2
(OH,F)
 
8
9.DB.05Vanadiocarpholite
Mn
2+
 
V
3+
 
Al(Si
 
2
O
 
6
)(OH)
 
4
9.DB.10Lorenzenite
Na
 
2
Ti
 
2
(Si
 
2
O
 
6
)O
 
3
9.DB.15Lintisite
LiNa
 
3
Ti
 
2
(Si
 
2
O
 
6
)
 
2
O
 
2
· 2H
 
2
O
9.DB.15Punkaruaivite
LiTi
 
2
(HSi
 
4
O
 
12
)(OH)
 
2
· H
 
2
O
9.DB.17Eliseevite
LiNa
 
1.5
Ti
 
2
(H
 
1.5
Si
 
4
O
 
12
)O
 
2
· 2H
 
2
O
9.DB.20Kukisvumite
Na
 
6
ZnTi
 
4
(Si
 
8
O
 
24
)O
 
4
· 4H
 
2
O
9.DB.20Manganokukisvumite
Na
 
6
MnTi
 
4
(Si
 
8
O
 
24
)O
 
4
· 4H
 
2
O
9.DB.25Vinogradovite
(Na,Ca,K)
 
4
Ti
 
4
AlSi
 
6
O
 
23
(OH) · 2H
 
2
O
9.DB.25Paravinogradovite
Na
 
1-2
(Ti,Fe
3+
 
)
 
4
(Si
 
2
O
 
6
)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
4
· H
 
2
O
9.DB.30Nchwaningite
Mn
2+
2
(SiO
 
3
)(OH)
 
2
· H
 
2
O
9.DB.35Plancheite
Cu
 
8
(Si
 
8
O
 
22
)(OH)
 
4
· H
 
2
O
9.DB.40Shattuckite
Cu
 
5
(Si
 
2
O
 
6
)
 
2
(OH)
 
2
9.DB.40UM2005-31-SiO:CuH
Cu
 
11
(SiO
 
4
)(OH)
 
18
· 9H
 
2
O ?
9.DB.45Aerinite
(Ca
 
5.1
Na
 
0.5
)(Fe
3+
 
,Al,Fe
2+
 
,Mg)
 
4
(Al,Mg)
 
6
[HSi
 
12
O
 
36
(OH)
 
12
][(CO
 
3
)
 
1.2
(H
 
2
O)
 
12
]

Other Names for Capranicaite

Synonyms:
IMA2009-086
Other Languages:

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 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

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  • Localities for Capranicaite

    (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
    • 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
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