Sjogrenite Mineral Data

Sjogrenite Mineral Data +

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General Sjogrenite Information

Chemical Formula:

Mg6Fe+++2(CO3)(OH)16·4(H2O)

Composition:

Molecular Weight = 661.71 gm

Magnesium 22.04 % Mg 36.55 % MgO

Iron 16.88 % Fe 24.13 % Fe₂O₃

Hydrogen 3.66 % H 33.62 % H₂O

Carbon 1.82 % C 7.01 % CO₂

Oxygen 55.61 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₆Fe³⁺₂(CO₃)(OH)₁₆·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1940

Locality:

Link to MinDat.org Location Data.

Synonym:

Sjoegrenite

Sjogrenite Image

Images:

Sjogrenite

Comments: Red-brown sjogrenite crust on serpentinite rock.
Location: Fort Point, San Francisco County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sjogrenite Crystallography

Axial Ratios:

a:c = 1:5.01445

Cell Dimensions:

a = 3.113, c = 15.61, Z = 0.25; V = 131.01 Den(Calc)= 2.05

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 7.79(1), 3.89(0.8), 1.86(0.4),

Crystal Structure:

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Ingram L , Taylor H F W , Mineralogical Magazine , 36 (1967) p.465-479, The crystal structures of sjoegrenite and pyroaurite, Locality: Sweden

Physical Properties of Sjogrenite

Color:

White, Yellowish, Brownish.

Density:

2.11

Diaphaniety:

Transparent

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Waxy

Optical Properties of Sjogrenite

Gladstone-Dale:

CI meas= -0.086 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.118 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2739,KPDmeas= 0.2661,KC= 0.245

Optical Data:

Uniaxial (-), e=1.55, w=1.573, bire=0.0230.

Calculated Properties of Sjogrenite

Electron Density:

r_electron=2.16 gm/cc
note: r_Sjogrenite=2.11 gm/cc.

Fermion Index

Fermion Index = 0.02672
Boson Index = 0.97328

Photoelectric:

PE_Sjogrenite= 5.55 barns/electron
U=PE_Sjogrenite x r_electron= 11.97 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sjogrenite is Not Radioactive

Sjogrenite Classification

Dana Class:

16b.6.1.3 (16b)Carbonates - Hydroxyl or Halogen

(16b.6)Dana Type

(16b.6.1)Sjorgrenite-Hydrotalcite Group (Sojogrenite Subgroup:Hexagonal)

16b.6.1.1 Manasseite Mg6Al2(CO3)(OH)16·4(H2O) P 6₃/mmc 6/m 2/m 2/m

16b.6.1.2 Barbertonite Mg6Cr2(CO3)(OH)16·4(H2O) P 6₃/mmc 6/m 2/m 2/m

16b.6.1.3 Sjogrenite Mg6Fe2(CO3)(OH)14·5(H2O) P 6₃/mmc 6/m 2/m 2/m

16b.6.1.4 Zaccagnaite! Zn4Al2(OH)12(CO3)·3(H2O) P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

V/E.02-40 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.02 - Manasseite group

V/E.02-05 Quintinite-2H Mg4Al2(OH)12CO3·4(H2O) P 6₃22 6 2 2

V/E.02-05* Quintinite-3T Mg4Al2(OH)12CO3·4(H2O) P 3₁12,P 3₂12 3 2

V/E.02-07 Caresite Fe4Al2(OH)12CO3·3(H2O) P 3₁12 or P 3₂12 3 2

V/E.02-08 Charmarite-2H Mn4Al2(CO3)(OH)12·3(H2O) P 6₃22 6 2 2

V/E.02-08* Charmarite-3T Mn4Al2(CO3)(OH)12·3(H2O) P 3₁12 3 2

V/E.02-09 Zaccagnaite! Zn4Al2(OH)12(CO3)·3(H2O) P 6₃/mmc 6/m 2/m 2/m

V/E.02-10 Manasseite Mg6Al2(CO3)(OH)16·4(H2O) P 6₃/mmc 6/m 2/m 2/m

V/E.02-20 Chlormagaluminite (Mg,Fe)4Al2(OH)12(Cl2,CO3)·2(H2O) P 6/mcm, P 6cm, P 6c2 Hex

V/E.02-30 Barbertonite Mg6Cr2(CO3)(OH)16·4(H2O) P 6₃/mmc 6/m 2/m 2/m

V/E.02-40 Sjogrenite Mg6Fe2(CO3)(OH)14·5(H2O) P 6₃/mmc 6/m 2/m 2/m

Other Sjogrenite Information

References:

NAME( Athena) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Sjogrenite

Mg6Fe++2(CO3)(OH)14·5(H2O)
Dana No: 16b.6.1.3 Strunz No: V/E.02-40
Locality:

Notes: