General Vishnevite Information
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Chemical Formula: |
(Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) |
Composition: |
Molecular Weight = 1,041.34 gm |
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Potassium 3.75 % K 4.52 % K2O |
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Sodium 14.35 % Na 19.34 % Na2O |
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Calcium 0.38 % Ca 0.54 % CaO |
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Aluminum 15.03 % Al 28.39 % Al2O3 |
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Silicon 16.72 % Si 35.77 % SiO2 |
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Hydrogen 0.27 % H 2.42 % H2O |
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Carbon 0.46 % C 1.69 % CO2 |
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Sulfur 2.16 % S 5.38 % SO3 |
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Chlorine 1.70 % Cl 1.70 % Cl |
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- % Cl -0.38 % -O=Cl2 |
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Oxygen 45.17 % O |
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______ ______ |
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100.00 % 99.39 % = TOTAL OXIDE |
Empirical Formula: |
Na6.5KCa0.1Si6.2Al5.8O24(SO4)0.7(CO3)0.4Cl0.5·1.4(H2O) |
Environment: |
In poikilitic aegirine-nepheline-sodalite syenites and associated pegmatites. |
IMA Status: |
Valid Species (Pre-IMA) 1931 |
Locality: |
From the Kurochkin Vally, Vishnevy-Ilmen Mountains, Soputhern Urals, Russia. Link to MinDat.org Location Data. |
Name Origin: |
Named for the locality. |
Synonym: |
ICSD 201804 |
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PDF 46-1333 |
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Sulfatic cancrinite |
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Vishnevite Image |
Images:
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Vishnevite Crystallography
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Axial Ratios: |
a:c = 1:0.40647 |
Cell Dimensions: |
a = 12.67, c = 5.15, Z = 1; V = 715.96 Den(Calc)= 2.42 |
Crystal System: |
Hexagonal - TrapezohedralH-M Symbol (6 2 2) Space Group: P 6322 |
X Ray Diffraction: |
By Intensity(I/Io): 3.273(1), 3.695(0.88), 2.769(0.65),4.742(0.5), 2.649(0.28), 2.101(0.27), 6.4(0.25), |
Crystal Structure:
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Hassan I , Grundy H D , The Canadian Mineralogist , 22 (1984) p.333-349, The character of the cancrinite-vishnevite solid-solution series
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Physical Properties of Vishnevite
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Cleavage: |
[1010] Perfect, [0001] Indistinct |
Color: |
Colorless, Yellow, White, Light blue, Light gray. |
Density: |
2.32 - 2.42, Average = 2.37 |
Diaphaniety: |
Transparent to Translucent |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
5-6 - Between Apatite and Orthoclase |
Luster: |
Vitreous - Pearly |
Streak: |
white |
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Optical Properties of Vishnevite
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Gladstone-Dale: |
CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2045,KPDmeas= 0.2089,KC= 0.2066 |
Optical Data: |
Uniaxial (-), e=1.488-1.495, w=1.49-1.507, bire=0.0020-0.0120. |
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Calculated Properties of Vishnevite
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Electron Density: |
relectron=2.39 gm/cc note: rVishnevite =2.42 gm/cc. |
Fermion Index |
Fermion Index = 0.00824 Boson Index = 0.99176 |
Photoelectric: |
PEVishnevite = 1.98 barns/electron U=PEVishnevite x relectron= 4.75 barns/cc. |
Radioactivity: |
GRapi = 53.58 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Vishnevite - barely detectable
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Vishnevite Classification
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Dana Class: |
76.2.5.15 (76)Tectosilicate Al-Si Framework |
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(76.2)Feldspathoids and related species |
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(76.2.5)Cancrinite group |
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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 |
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76.2.5.2 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 31c 3m |
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76.2.5.3 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6 |
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76.2.5.4 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 63 6 |
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76.2.5.5 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63/m 6/m |
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76.2.5.6 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 321 3 2 |
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76.2.5.7 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 31c 3m |
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76.2.5.8 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 63 6 |
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76.2.5.9 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2 |
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76.2.5.10 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6322 6 2 2 |
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76.2.5.11 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 63 6 |
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76.2.5.12 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63/m 6/m |
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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 |
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76.2.5.14 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6222 6 2 2 |
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76.2.5.15 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6322 6 2 2 |
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76.2.5.16 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2 |
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76.2.5.17 Marinellite! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2·6(H2O) P 31c or P 2c Trig |
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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.09-70 VIII - Silicates |
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VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders |
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VIII/J.09 - Cancrinite group |
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VIII/J.09-05 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 63 6 |
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VIII/J.09-10 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6 |
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VIII/J.09-15 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 63 6 |
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VIII/J.09-20 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63/m 6/m |
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VIII/J.09-25 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63/m 6/m |
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VIII/J.09-30 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6322 6 2 2 |
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VIII/J.09-40 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 31c 3m |
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VIII/J.09-45 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 31c 3m |
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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 |
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VIII/J.09-55 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6222 6 2 2 |
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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 |
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VIII/J.09-65 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 63 6 |
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VIII/J.09-70 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6322 6 2 2 |
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VIII/J.09-80 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 321 3 2 |
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VIII/J.09-90 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2 |
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VIII/J.09-100 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2 |
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Other Vishnevite Information
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References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2) |
See Also: |
Links to other databases for Vishnevite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Vishnevite
(Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O)
Dana No: 76.2.5.15 Strunz No: VIII/J.09-70
Locality:
Notes:
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