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Sergeevite Mineral Data

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General Sergeevite Information

Help on Chemical  Formula: Chemical Formula: Ca2Mg11(CO3)9(HCO3)4(OH)4•6(H2O)
Help on Composition: Composition: Molecular Weight = 1,307.78 gm
   Calcium     6.13 %  Ca    8.58 % CaO
   Magnesium  20.44 %  Mg   33.90 % MgO
   Hydrogen    1.54 %  H    13.78 % H2O
   Carbon     11.94 %  C    43.75 % CO2
   Oxygen     59.95 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Mg11(CO3)9(HCO3)4(OH)4•6(H2O)
Help on Environment: Environment: Weathering product of pyroxene-garnet skarn.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Tyrnyauz, Caucasus, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Evengi M. Sergeev (1914-), engineering geologist, Moscow University.
Help on Name Pronunciation: Name Pronunciation: Sergeevite + Pronunciation Say SERGEEVITE

Sergeevite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.41136
Help on Cell Dimensions: Cell Dimensions: a = 19.01, c = 7.82, Z = 3; V = 2,447.38 Den(Calc)= 2.66
Help on Crystal System: Crystal System: Trigonal - Trapezohedral H-M Symbol (3 2) Space Group: R 32
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.82(1), 1.965(0.3), 2.87(0.3),3.58(0.3), 7.14(0.3), 1.755(0.2), 3.37(0.2), 2.68(0.1),

Physical Properties of Sergeevite

Help on Cleavage: Cleavage: None
Help on Color: Color: White.
Help on Density: Density: 2.2 - 2.35, Average = 2.27
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white

Optical Properties of Sergeevite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.125 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2165,KPDmeas= 0.2532,KC= 0.225
Ncalc = 1.49 - 1.6
Help on Optical Data: Optical Data: Uniaxial (?), a=1.571, b=1.581, bire=0.0100.

Calculated Properties of Sergeevite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Sergeevite =2.66 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESergeevite = 1.39 barns/electron
U=PESergeevite x rElectron Density= 3.75 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sergeevite is Not Radioactive

Sergeevite Classification

Help on  Dana Class: Dana Class: (13)Acid Carbonates
  (13.01)with miscellaneous formulae
  (13.01.07)Dana Group Sergeevite Ca2Mg11(CO3)9(HCO3)4(OH)4•6(H2O) R 32 3 2
Help on  Strunz Class: Strunz Class: 05.DB.25 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DB -With large and medium-sized cations
05.DB.25 Sergeevite Ca2Mg11(CO3)9(HCO3)4(OH)4•6(H2O) R 32 3 2

Other Sergeevite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Sergeevite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 05.DB.25





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