Organovaite-Mn Mineral Data

General Organovaite-Mn Information

Chemical Formula: K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) Composition: Molecular Weight = 2,372.13 gm    Potassium   3.79 %  K     4.57 % K₂O    Barium      1.16 %  Ba    1.29 % BaO    Sodium      0.39 %  Na    0.52 % Na₂O    Calcium     0.84 %  Ca    1.18 % CaO    Titanium    5.65 %  Ti    9.43 % TiO₂    Manganese   4.17 %  Mn    5.38 % MnO    Niobium    20.76 %  Nb   29.69 % Nb₂O₅    Aluminum    0.11 %  Al    0.21 % Al₂O₃    Zinc        1.65 %  Zn    2.06 % ZnO    Iron        0.24 %  Fe    0.30 % FeO    Silicon    18.83 %  Si   40.27 % SiO₂    Hydrogen    0.59 %  H     5.32 % H₂O    Oxygen     41.82 %  O              ______        ______               100.00 %      100.24 % = TOTAL OXIDE Empirical Formula: K_2.3Zn_0.6Ca_0.5Na_0.4Ba_0.2Mn²⁺_1.8Fe²⁺_0.1Nb_5.3Ti_2.8Si_15.9Al_0.1O₅₄(OH)₂·6(H₂O) Environment: Alkaline pegmatites. Sometimes forms pseudomorphs after vuonnemite. IMA Status: Approved IMA 2002 (Dana # Added) Locality: Mount Karnasurt, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. Name Origin: Named for Natalia Ivanovna Organova (1929-), Russian crystallographer and the Mn end-member. Synonym: IMA2000-031  

Organovaite-Mn Image

Images:

Organovaite-Mn Comments: Crude pink organovaite-Mn pseudomorphs after vuonnemite. Location: Mt. Karnasurt, Lovozero, Kola Peninsula, Russia. Scale: Specimen Size 1.5x2.5 cm. © Diederik Visser

Organovaite-Mn Crystallography

Axial Ratios: a:b:c =1.0392:1:1.1214 Cell Dimensions: a = 14.551, b = 14.001, c = 15.702, Z = 2; beta = 117.584° V = 2,835.33 Den(Calc)= 2.78 Crystal System: Monoclinic - DomaticH-M Symbol (m) Space Group: Cm X Ray Diffraction: By Intensity(I/I_o): 6.99(1)(020), 3.227(0.89)(422,400,4043.123(0.68)(042,024), 2.52(0.29)(442,402,406)4.936(0.28)(022), 2.607(0.25)(244,204,20 

Physical Properties of Organovaite-Mn

Cleavage: None Color: Rose brown, Pink, Yellow brown. Density: 2.88 Diaphaneity: Transparent to Translucent Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments. Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). Habit: Pseudomorphous - Occurs in the form of another mineral. Hardness: 5 - Apatite Luster: Vitreous (Glassy) Streak: white  

Optical Properties of Organovaite-Mn

Gladstone-Dale: CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2578,KPDmeas= 0.2488,KC= 0.2474
Ncalc = 1.69 - 1.71 Optical Data: Biaxial (+), a=1.683, b=1.692, g=1.775, bire=0.0920, 2V(Calc)=38, 2V(Meas)=40. Dispersion weak.  

Calculated Properties of Organovaite-Mn

Electron Density: Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Organovaite-Mn =2.88 gm/cc.
Fermion Index: Fermion Index = 0.01
Boson Index = 0.99 Photoelectric: PE_{Organovaite-Mn} = 39.27 barns/electron
U=PE_{Organovaite-Mn} x r_electron= 109.44 barns/cc.
Radioactivity:

GRapi = 52.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Organovaite-Mn per GRapi unit = 1.89 (%)

Estimated Radioactivity from Organovaite-Mn - barely detectable

 

Organovaite-Mn Classification

Dana Class: 60.01.03h.01 (60)Cyclosilicate Four-Membered Rings   (60.01)as Titanosilicates   (60.01.03h)Labuntsovite Group (Organovaite subgroup Monoclinic [C2/m])  

60.01.03h.01 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) Cm m

 

60.01.03h.02 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m

 

60.01.03h.03 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m

Strunz Class: 09.CE.30g 09 - SILICATES (Germanates)   09.C - Cyclosilicates   09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),  

09.CE.30g Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m

 

09.CE.30g Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m

 

09.CE.30g Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) Cm m

 

Other Organovaite-Mn Information

References: NAME( AmMin, v 87, p 1734) PHYS. PROP.(AmMin, v 87, p 1734) OPTIC PROP.(AmMin, v 87, p 1734) See Also: Links to other databases for Organovaite-Mn :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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