General Nenadkevichite Information
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Chemical Formula: |
(Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) |
Composition: |
Molecular Weight = 308.14 gm |
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Potassium 0.76 % K 0.92 % K2O |
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Sodium 6.71 % Na 9.05 % Na2O |
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Calcium 0.39 % Ca 0.55 % CaO |
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Titanium 4.66 % Ti 7.78 % TiO2 |
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Niobium 21.11 % Nb 30.19 % Nb2O5 |
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Silicon 18.23 % Si 39.00 % SiO2 |
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Hydrogen 1.41 % H 12.57 % H2O |
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Oxygen 46.73 % O |
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______ ______ |
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100.00 % 100.05 % = TOTAL OXIDE |
Empirical Formula: |
Na0.9K0.06Ca0.03Nb0.7Ti0.3Si2O6.7(OH)0.3·2(H2O) |
Environment: |
Between crystals of microcline in a natrolite-albite-rich pegmatite in nepheline syenite in a differentiated alkalic massif. |
IMA Status: |
Valid Species (Pre-IMA) 1955 (Dana # Changed) |
Locality: |
Lovozero Massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. |
Name Origin: |
Named for Konstantin A. Nenadkevich, Russian mineralogist and geochemist. |
Synonym: |
ICSD 2584 |
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Nenadkevichite - (60.1.3.1) |
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PDF 25-1189 |
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Nenadkevichite Image |
Images:
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Nenadkevichite Crystallography
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Axial Ratios: |
a:b:c =0.5217:1:0.5034 |
Cell Dimensions: |
a = 7.408, b = 14.198, c = 7.148, Z = 4; V = 751.82 Den(Calc)= 2.72 |
Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam |
X Ray Diffraction: |
By Intensity(I/Io): 7.099(1), 7.148(0.97), 6.568(0.65), |
Forms:
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Crystal Structure:
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Rastsvetaeva R K , Tamazyan R A , Pushcharovsky D Y , Nadezhina T N , European Journal of Mineralogy , 6 (1994) p.503-509, Crystal structure and microtwinning of K-rich nenadkevichite, Note: Wat4 y-coordinate changed to reproduce reported bond lengths
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Physical Properties of Nenadkevichite
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Cleavage: |
[001] Indistinct |
Color: |
Brown, Brown, Rose, Yellow, Tan. |
Density: |
2.838 - 2.885, Average = 2.86 |
Diaphaniety: |
Opaque |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite). |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
Hardness: |
5 - Apatite |
Luster: |
Earthy (Dull) |
Streak: |
light pink |
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Optical Properties of Nenadkevichite
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Gladstone-Dale: |
CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2539,KPDmeas= 0.2413,KC= 0.2555 |
Optical Data: |
Biaxial (+), a=1.633-1.659, b=1.642-1.686, g=1.738-1.785, bire=0.1050-0.1260, 2V(Calc)=36-58, 2V(Meas)=31-45. |
Pleochroism (x): |
colorless. |
Pleochroism (y): |
pale yellow. |
Pleochroism (z): |
pale rose. |
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Calculated Properties of Nenadkevichite
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Electron Density: |
relectron=2.67 gm/cc note: rNenadkevichite =2.72 gm/cc. |
Fermion Index |
Fermion Index = 0.01477 Boson Index = 0.98523 |
Photoelectric: |
PENenadkevichite = 32.14 barns/electron U=PENenadkevichite x relectron= 85.82 barns/cc. |
Radioactivity: |
GRapi = 10.80 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Nenadkevichite - barely detectable
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Nenadkevichite Classification
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Dana Class: |
60.1.3a.1 (60)Cyclosilicate Four-Membered Rings |
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(60.1)as Titanosilicates |
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(60.1.3a)Labuntsovite Group (Nenadkevichite subgroup Orthorhombic [Pbam]) |
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60.1.3a.1 Nenadkevichite ! (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m |
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60.1.3a.2 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m |
Strunz Class: |
VIII/E.07-20 VIII - Silicates |
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VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8- |
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VIII/E.07 - Labuntsovite Group |
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VIII/E.07-10 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m |
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VIII/E.07-20 Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m |
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VIII/E.07-30* Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m |
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VIII/E.07-30 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m |
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VIII/E.07-32 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m |
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VIII/E.07-33 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m |
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VIII/E.07-34 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m |
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VIII/E.07-40 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m |
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VIII/E.07-50 Clinophosinaite! Na3CaPSiO7 P 2/c 2/m |
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VIII/E.07-50* Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m |
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VIII/E.07-60* Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4·5(H2O) C 2/m 2/m |
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VIII/E.07-60 Phosinaite-(Ce)! Na13Ca2Ce[Si4O12](PO4)4 P 22121 2 2 2 |
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VIII/E.07-70 Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O) C 2/m 2/m |
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VIII/E.07-80 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m |
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VIII/E.07-90 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m |
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VIII/E.07-100 Lemmleinite-K! NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O) C 2/m 2/m |
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VIII/E.07-110 Lemmleinite-Ba! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4·5(H2O) C 2/m 2/m |
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VIII/E.07-130 Paralabuntsovite-Mg! Na8K8Mg8Ti16(Si4O12)8(O,OH)16·n(H2O) I2/m 2/m |
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VIII/E.07-140 Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m |
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VIII/E.07-150 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m |
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VIII/E.07-155 Labuntsovite-Mn Na4K4(Ba,K)(Mn,Fe)1x(Ti,Nb)8[Si4O12]4(O,OH)8·n(H2O),n=10-12 I2/m 2/m |
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VIII/E.07-170 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m |
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VIII/E.07-180 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m |
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VIII/E.07-190 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) Cm m |
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VIII/E.07-200 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O) Cm m |
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VIII/E.07-205 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O) Cm m |
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VIII/E.07-210 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m |
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VIII/E.07-220 Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m |
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Other Nenadkevichite 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 Nenadkevichite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 -Am. Min. Crystal Structure Database
4 -Athena
5 - EUROmin Project
6 -Google Images
7 -Google Scholar
8 -Handbook of Mineralogy (MinSocAm)
9 -Handbook of Mineralogy (UofA)
10 -MinDAT
11 -MinMax(Deutsch)
12 -MinMax(English)
13 -Mineralienatlas (Deutsch)
14 -QUT Mineral Atlas
15 - WWW-MINCRYST
16 -École des Mines de Paris
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Nenadkevichite
(Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O)
Dana No: 60.1.3a.1 Strunz No: VIII/E.07-20
Locality:
Notes:
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