Sergeevite Mineral Data

Sergeevite Mineral Data +

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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.

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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 - TrapezohedralH-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

Optical Data:

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

Calculated Properties of Sergeevite

Electron Density:

r_electron=2.69 gm/cc
note: r_Sergeevite=2.66 gm/cc.

Fermion Index

Fermion Index = 0.02212
Boson Index = 0.97788

Photoelectric:

PE_Sergeevite= 1.39 barns/electron
U=PE_Sergeevite x r_electron= 3.75 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sergeevite is Not Radioactive

Sergeevite Classification

Dana Class:

13.1.7.1 (13)Acid Carbonates

(13.1)with miscellaneous formulae

(13.1.7)Dana Group

13.1.7.1 Sergeevite Ca2Mg11(CO3)9(HCO3)4(OH)4·6(H2O) R 32 3 2

Strunz Class:

V/E.03-80 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.03 - Hydrotalcite group

V/E.03-10 Hydrotalcite Mg6Al2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-20 Stichtite Mg6Cr2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-30 Pyroaurite Mg6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-40 Desautelsite Mg6Mn2(CO3)(OH)16·4(H2O) R 3m or R 3m Trig

V/E.03-50 Takovite Ni6Al2(OH)16(CO3,OH)·4(H2O) R 3m 3 2/m

V/E.03-60 Reevesite Ni6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-70 Comblainite Ni6Co2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-80 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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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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: 13.1.7.1 Strunz No: V/E.03-80
Locality:

Notes: