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Capranicaite

A valid IMA mineral species

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Photos of Capranicaite (11)

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Capranicaite

Capranica, Viterbo Province, Lazio, Italy

Capranicaite

Capranica, Viterbo Province, Lazio, Italy

Capranicaite

Capranica, Viterbo Province, Lazio, Italy

Capranicaite

Capranica, Viterbo Province, Lazio, Italy

Capranicaite

Capranica, Viterbo Province, Lazio, Italy

Capranicaite

Capranica, Viterbo Province, Lazio, Italy

Capranicaite

Capranica, Viterbo Province, Lazio, Italy

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About CapranicaiteHide

Formula:

KCaNaAl₄B₄Si₂O₁₈

K is partially substituted by small amounts of Cs

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.

Type Locality:

ⓘ Capranica, Viterbo Province, Lazio, Italy

This page provides mineralogical data about Capranicaite.

Unique IdentifiersHide

Mindat ID:

39882

Long-form identifier:

mindat:1:1:39882:2

GUID
(UUID V4):

664d462d-5ace-4034-8e61-fc9c69d79937

IMA Classification of CapranicaiteHide

IMA status:

Approved

Approval year:

2010

First published:

2011

Type description reference:

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.

Classification of CapranicaiteHide

Strunz-mindat (2024):

9.DB.50

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

Dana 8th ed.:

65.1.12.

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Cpc	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CapranicaiteHide

Lustre:

Vitreous

Transparency:

Transparent

Colour:

Colourless

Streak:

White

Hardness Data:

Could not be measured

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:

n_α = 1.495(1) n_β = 1.543(1) n_γ = 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

Dispersion:

None

Pleochroism:

Non-pleochroic

Chemistry of CapranicaiteHide

Mindat Formula:

KCaNaAl₄B₄Si₂O₁₈

K is partially substituted by small amounts of Cs

Elements listed:

Al, B, Ca, K, Na, O, Si - search for minerals with similar chemistry

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 Å³

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0018373	Capranicaite	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		2011	Vico volcanic complex, Capranica, Viterbo Province, Latium, Italy	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Capranicaite'
loop_
_publ_author_name
'Callegari A M'
'Boiocchi M'
'Bellatreccia F'
'Caprilli E'
'Medenbach O'
'Cavallo A'
_journal_name_full 'Mineralogical Magazine'
_journal_volume 75 
_journal_year 2011
_journal_page_first 33
_journal_page_last 43
_publ_section_title
;
 Capranicaite, (K,_)(Ca,Na)Al4B4Si2O18: a new inosilicate from Capranica,
 Italy, with a peculiar topology of the periodic single chain [Si2O6]
;
_database_code_amcsd 0018373
_chemical_compound_source 'Vico volcanic complex, Capranica, Viterbo Province, Latium, Italy'
_chemical_formula_sum 'Si2 Al4 B4 (Ca1.21 Na.79) K.72 Cs.07 O18'
_cell_length_a 4.8507
_cell_length_b 16.6156
_cell_length_c 20.5445
_cell_angle_alpha 90
_cell_angle_beta 90.245
_cell_angle_gamma 90
_cell_volume 1655.816
_exptl_crystal_density_diffrn      2.405
_symmetry_space_group_name_H-M 'P 1 21/n 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Si1   0.80240   0.85700   0.24960   1.00000   0.01600
Si2   0.19800   0.46930   0.25060   1.00000   0.01510
Al1   0.25170   0.53570   0.39470   1.00000   0.00990
Al2   0.24830   0.53570   0.10580   1.00000   0.00990
Al3   0.75440   0.79450   0.10440   1.00000   0.01070
Al4   0.74560   0.79510   0.39540   1.00000   0.01060
B1   0.25420   0.70720   0.08090   1.00000   0.01550
B2   0.24570   0.70740   0.41860   1.00000   0.01660
B3   0.74890   0.45820   0.42950   1.00000   0.01050
B4  -0.24960   0.45840   0.07030   1.00000   0.01160
CaM1   0.73770   0.62890   0.00370   0.60000   0.01380
NaM1   0.73770   0.62890   0.00370   0.40000   0.01380
CaM2   0.23950   0.37060   0.50380   0.61000   0.01340
NaM2   0.23950   0.37060   0.50380   0.39000   0.01340
KA   0.71250   0.63370   0.25000   0.72000   0.06000
CsA   0.71250   0.63370   0.25000   0.07000   0.06000
O1   0.61930   0.93870   0.24840   1.00000   0.03040
O2   0.11960   0.88830   0.24960   1.00000   0.03090
O3   0.74740   0.80150   0.18730   1.00000   0.02850
O4   0.74590   0.80330   0.31260   1.00000   0.02900
O5   0.24900   0.52500   0.18830   1.00000   0.02840
O6   0.25700   0.52560   0.31210   1.00000   0.02890
O7   0.52770   0.71730   0.42120   1.00000   0.01660
O8   0.42650   0.77270   0.07240   1.00000   0.01640
O9   0.97240   0.71730   0.07740   1.00000   0.01690
O10   0.07300   0.77290   0.42730   1.00000   0.01720
O11   0.03140   0.46560   0.43120   1.00000   0.01440
O12  -0.08360   0.52500   0.07270   1.00000   0.01540
O13   0.46900   0.46600   0.06900   1.00000   0.01550
O14   0.58440   0.52510   0.42750   1.00000   0.01600
O15   0.63460   0.88300   0.43460   1.00000   0.01690
O16   0.86660   0.88300   0.06620   1.00000   0.01620
O17   0.13320   0.63110   0.41790   1.00000   0.01720
O18   0.36800   0.63130   0.08360   1.00000   0.01800
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Si1 0.01550 0.01980 0.01260 -0.00270 0.00070 0.00000
Si2 0.01350 0.01870 0.01290 -0.00150 0.00020 0.00000
Al1 0.00830 0.01000 0.01150 -0.00010 0.00020 -0.00020
Al2 0.00800 0.01010 0.01160 -0.00020 0.00010 0.00050
Al3 0.01160 0.00830 0.01220 -0.00030 0.00050 -0.00030
Al4 0.01150 0.00830 0.01180 -0.00070 0.00100 0.00030
B1 0.00670 0.00570 0.03430 -0.00030 0.00020 -0.00110
B2 0.00510 0.00400 0.04080 0.00120 0.00030 0.00000
B3 0.01070 0.01110 0.00970 0.00060 0.00020 -0.00080
B4 0.01020 0.01030 0.01420 -0.00010 0.00030 0.00040
CaM1 0.01400 0.01310 0.01440 0.00000 0.00020 -0.00010
NaM1 0.01400 0.01310 0.01440 0.00000 0.00020 -0.00010
CaM2 0.01340 0.01250 0.01420 0.00010 -0.00010 -0.00010
NaM2 0.01340 0.01250 0.01420 0.00010 -0.00010 -0.00010
KA 0.05870 0.02430 0.09700 -0.00560 0.00760 0.00150
CsA 0.05870 0.02430 0.09700 -0.00560 0.00760 0.00150
O1 0.01360 0.02880 0.04870 0.00070 0.00110 0.00160
O2 0.01480 0.02490 0.05290 -0.00200 0.00120 0.00070
O3 0.03960 0.03230 0.01350 -0.00670 -0.00050 -0.00320
O4 0.03610 0.03590 0.01490 -0.00670 0.00050 0.00380
O5 0.03960 0.03220 0.01350 -0.00490 -0.00020 0.00510
O6 0.03920 0.03430 0.01320 -0.00820 0.00120 -0.00310
O7 0.00990 0.01130 0.02860 -0.00080 -0.00010 0.00400
O8 0.01280 0.01180 0.02450 -0.00310 -0.00220 0.00450
O9 0.01040 0.01050 0.02980 0.00080 -0.00060 -0.00340
O10 0.01300 0.01270 0.02570 0.00320 -0.00150 -0.00460
O11 0.00950 0.01130 0.02230 0.00000 0.00060 0.00330
O12 0.01070 0.01000 0.02560 -0.00170 -0.00350 0.00250
O13 0.00900 0.01230 0.02520 0.00050 0.00000 -0.00390
O14 0.01020 0.01190 0.02590 0.00150 -0.00260 -0.00180
O15 0.01370 0.00940 0.02760 -0.00160 0.00590 -0.00230
O16 0.01440 0.00830 0.02590 0.00180 0.00510 0.00150
O17 0.01150 0.00930 0.03100 -0.00130 0.00250 -0.00100
O18 0.01150 0.01110 0.03130 0.00040 0.00230 0.00170

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
4.104 Å	(90)
3.424 Å	(83)
3.234 Å	(100)
3.119 Å	(32)
2.425 Å	(31)
2.405 Å	(37)
2.184 Å	(38)
1.564 Å	(30)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 3a: Earth’s earliest Hadean crust	>4.50
9 : Lava/xenolith minerals (hornfels, sanidinite facies)
10 : Basalt-hosted zeolite minerals

Type Occurrence of CapranicaiteHide

Type Locality:

ⓘ Capranica, Viterbo Province, Lazio, 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.

Reference:

Download:

https://rruff.info/rruff_1.0/uploads/MM75_33.pdf

Synonyms of CapranicaiteHide

IMA2009-086

Related Minerals - Strunz-mindat Grouping Hide

9.DB.05	Balipholite	BaLiMg₂Al₃(Si₂O₆)₂(OH)₄	Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.05	Carpholite	Mn²⁺Al₂(Si₂O₆)(OH)₄	Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.05	Ferrocarpholite	Fe²⁺Al₂Si₂O₆(OH)₄	Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.05	Magnesiocarpholite	MgAl₂Si₂O₆(OH)₄	Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.05	Potassiccarpholite	K(Mn²⁺,Li)₂Al₄Si₄O₁₂(OH,F)₈	Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.05	Vanadiocarpholite	Mn²⁺V³⁺Al(Si₂O₆)(OH)₄	Orth. mmm (2/m 2/m 2/m) : Ccca
9.DB.10	Lorenzenite	Na₂Ti₂(Si₂O₆)O₃	Orth. mmm (2/m 2/m 2/m) : Pbcn
9.DB.15	Lintisite	LiNa₃Ti₂(Si₂O₆)₂O₂ · 2H₂O	Mon. 2/m : B2/b
9.DB.15	Punkaruaivite	LiTi₂(HSi₄O₁₂)(OH)₂ · H₂O	Mon. 2/m : B2/b
9.DB.17	Eliseevite	LiNa_1.5Ti₂(H_1.5Si₄O₁₂)O₂ · 2H₂O	Mon. 2/m : B2/b
9.DB.20	Kukisvumite	Na₆ZnTi₄(Si₈O₂₄)O₄ · 4H₂O	Orth. mmm (2/m 2/m 2/m) : Pccn
9.DB.20	Manganokukisvumite	Na₆MnTi₄(Si₈O₂₄)O₄ · 4H₂O	Orth. mmm (2/m 2/m 2/m) : Pccn
9.DB.25	Vinogradovite	Na₄Ti₄(Si₂O₆)₂[(Si,Al)₄O₁₀]O₄ · (H₂O,Na,K)₃	Mon. 2/m : B2/b
9.DB.25	Paravinogradovite	Na_1-2(Ti,Fe³⁺)₄(Si₂O₆)₂(AlSi₃O₁₀)(OH)₄ · H₂O	Tric. 1 : P1
9.DB.30	Nchwaningite	Mn²⁺₂(SiO₃)(OH)₂ · H₂O	Orth. mm2 : Pca2₁
9.DB.35	Plancheite	Cu₈(Si₈O₂₂)(OH)₄ · H₂O	Orth. mmm (2/m 2/m 2/m)
9.DB.40	Shattuckite	Cu₅(Si₂O₆)₂(OH)₂	Orth. mmm (2/m 2/m 2/m)
9.DB.40	UM2005-31-SiO:CuH	Cu₁₁(SiO₄)(OH)₁₈ · 9H₂O (?)
9.DB.45	Aerinite	(Ca_5.1Na_0.5)(Fe³⁺,Al,Fe²⁺,Mg)₄(Al,Mg)₆[HSi₁₂O₃₆(OH)₁₂][(CO₃)_1.2(H₂O)₁₂]	Trig. 3m : P3c1

Fluorescence of CapranicaiteHide

In UV light:

None

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.

Internet Links for CapranicaiteHide

mindat.org URL:

https://www.mindat.org/min-39882.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for CapranicaiteHide

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.

(2023) Capranicaite. Handbook of Mineralogy. Mineralogical Society of America

Localities for CapranicaiteHide

ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Italy (TL)

Lazio

Viterbo Province

ⓘ Capranica (TL)

Bellatreccia et al. (2010) +1 other reference

Capranicaite

About CapranicaiteHide

Unique IdentifiersHide

IMA Classification of CapranicaiteHide

Classification of CapranicaiteHide

Mineral SymbolsHide

Physical Properties of CapranicaiteHide

Optical Data of CapranicaiteHide

Chemistry of CapranicaiteHide

Crystallography of CapranicaiteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of CapranicaiteHide

Synonyms of CapranicaiteHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of CapranicaiteHide

Other InformationHide

Internet Links for CapranicaiteHide

References for CapranicaiteHide

Localities for CapranicaiteHide

Related Minerals - Strunz-mindat Grouping Hide