Sergeevite Mineral Data

General Sergeevite Information

Chemical Formula:

Ca2Mg11(CO3)9(HCO3)4(OH)4•6(H2O)

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

Empirical Formula:

Ca₂Mg₁₁(CO₃)₉(HCO₃)₄(OH)₄•6(H₂O)

Environment:

Weathering product of pyroxene-garnet skarn.

IMA Status:

Approved IMA 1980

Locality:

Tyrnyauz, Caucasus, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Evengi M. Sergeev (1914-), engineering geologist, Moscow University.

Name Pronunciation:

Sergeevite + Pronunciation

Sergeevite Crystallography

Axial Ratios:

a:c = 1:0.41136

Cell Dimensions:

a = 19.01, c = 7.82, Z = 3; V = 2,447.38 Den(Calc)= 2.66

Crystal System:

Trigonal - Trapezohedral H-M Symbol (3 2) Space Group: R 32

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

By Intensity(I/I_o): 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

Cleavage:

None

Color:

White.

Density:

2.2 - 2.35, Average = 2.27

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

3.5 - Copper Penny

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Sergeevite

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

Optical Data:

Uniaxial (?), a=1.571, b=1.581, bire=0.0100.

Calculated Properties of Sergeevite

Electron Density:

Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Sergeevite =2.66 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Sergeevite= 1.39 barns/electron
U=PE_Sergeevite x rElectron Density= 3.75 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sergeevite is Not Radioactive

Sergeevite Classification

Dana Class:

13.01.07.01 (13)Acid Carbonates

(13.01)with miscellaneous formulae

(13.01.07)Dana Group

13.01.07.01 Sergeevite Ca2Mg11(CO3)9(HCO3)4(OH)4•6(H2O) R 32 3 2

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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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Print or Cut-and-Paste your Sergeevite Specimen Label here :

Sergeevite

Ca2Mg11(CO3)9(HCO3)4(OH)4•6(H2O)
Dana No: 13.01.07.01 Strunz No: 05.DB.25
Locality:

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