Cancrisilite Mineral Data

Cancrisilite Mineral Data

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General Cancrisilite Information

Chemical Formula:

Na7Al5Si7O24(C03)·3(H2O)

Composition:

Molecular Weight = 990.48 gm

Sodium 16.25 % Na 21.90 % Na₂O

Aluminum 13.62 % Al 25.74 % Al₂O₃

Silicon 19.85 % Si 42.46 % SiO₂

Hydrogen 0.61 % H 5.46 % H₂O

Carbon 1.21 % C 4.44 % CO₂

Oxygen 48.46 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₇Al₅Si₇O₂₄(CO₃)·3(H₂O)

Environment:

In ultra-agpaitic pegmatites in a differentiated alkalic massif.

IMA Status:

Approved IMA 1991

Locality:

From the Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For the relatively high ration of silicon to aluminum, and its relation to "cancrinite."

Synonym:

Carbonate vishnevite

IMA1990-013

Cancrisilite Image

Images:

Cancrisilite

Comments: Light pink crystalline cancrisilite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cancrisilite Crystallography

Axial Ratios:

a:c = 1:0.40596

Cell Dimensions:

a = 12.575, c = 5.105, Z = 1; V = 699.11 Den(Calc)= 2.35

Crystal System:

Hexagonal - PyramidalH-M Symbol (6) Space Group: P 6₃

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.22(1), 3.65(0.9), 6.3(0.7),

Physical Properties of Cancrisilite

Cleavage:

None

Color:

Colorless, Gray, Lilac, Light violet, Pink.

Density:

2.4

Diaphaniety:

Transparent to Translucent

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Cancrisilite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2126,KPDmeas= 0.2081,KC= 0.2111

Optical Data:

Uniaxial (-), e=1.49, w=1.509, bire=0.0190.

Calculated Properties of Cancrisilite

Electron Density:

r_electron=2.33 gm/cc
note: r_Cancrisilite=2.35 gm/cc.

Fermion Index

Fermion Index = 0.00963
Boson Index = 0.99037

Photoelectric:

PE_Cancrisilite= 1.44 barns/electron
U=PE_Cancrisilite x r_electron= 3.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cancrisilite is Not Radioactive

Cancrisilite Classification

Dana Class:

76.2.5.4 (76)Tectosilicate Al-Si Framework

(76.2)Feldspathoids and related species

(76.2.5)Cancrinite group

76.2.5.1 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O) P 6₃/mmc, P 6₃mc, or P 62c Hex

76.2.5.2 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 3₁c 3m

76.2.5.3 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 6₃ 6

76.2.5.4 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 6₃ 6

76.2.5.5 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 6₃/m 6/m

76.2.5.6 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 3₂1 3 2

76.2.5.7 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 3₁c 3m

76.2.5.8 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 6₃ 6

76.2.5.9 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2

76.2.5.10 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6₃22 6 2 2

76.2.5.11 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 6₃ 6

76.2.5.12 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 6₃/m 6/m

76.2.5.13 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4·n(H2O) P 6₃/mmc ? 6/m 2/m 2/m

76.2.5.14 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6₂22 6 2 2

76.2.5.15 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6₃22 6 2 2

76.2.5.16 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2

76.2.5.17 Marinellite! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2·6(H2O) P 3₁c or P 2c Trig

76.2.5.18 IMA2004-043! (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12·6(H2O) P 6₃/m 6/m 2/m 2/m

Strunz Class:

VIII/J.09-15 VIII - Silicates

VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders

VIII/J.09 - Cancrinite group

VIII/J.09-05 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 6₃ 6

VIII/J.09-10 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 6₃ 6

VIII/J.09-15 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 6₃ 6

VIII/J.09-20 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 6₃/m 6/m

VIII/J.09-25 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 6₃/m 6/m

VIII/J.09-30 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6₃22 6 2 2

VIII/J.09-40 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 3₁c 3m

VIII/J.09-45 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 3₁c 3m

VIII/J.09-50 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O) P 6₃/mmc, P 6₃mc, or P 62c Hex

VIII/J.09-55 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6₂22 6 2 2

VIII/J.09-60 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4·n(H2O) P 6₃/mmc ? 6/m 2/m 2/m

VIII/J.09-65 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 6₃ 6

VIII/J.09-70 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6₃22 6 2 2

VIII/J.09-80 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 3₂1 3 2

VIII/J.09-90 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2

VIII/J.09-100 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2

Other Cancrisilite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

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Cancrisilite

Na7Al5Si7O24(C03)·3(H2O)
Dana No: 76.2.5.4 Strunz No: VIII/J.09-15
Locality:

Notes: