Sjogrenite Mineral Data

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 32.67 % H₂O

Carbon 1.82 % C 6.65 % CO₂

Oxygen 55.61 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₆Fe³⁺₂(CO₃)(OH)₁₆•4(H₂O)

Environment:

In low-temperature hydrothermal veins in a metamorphosed Fe-Mn orebody (Langban, Sweden)

IMA Status:

Valid Species (Pre-IMA) 1940

Locality:

From Langban and Nordmark, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Stens Anders Hjalmar Sjogren (1856-1922), Swedish mineralogist, Professor of Mineralogy, University of Stockholm, Stockholm, Sweden.

Name Pronunciation:

Sjogrenite + Pronunciation

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)= 2.10

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

Diaphaneity:

Transparent

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Waxy

Optical Properties of Sjogrenite

Gladstone-Dale:

CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2674,KPDmeas= 0.2661,KC= 0.2742
Ncalc = 1.58

Optical Data:

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

Calculated Properties of Sjogrenite

Electron Density:

Bulk Density (Electron Density)=2.15 gm/cc
note: Specific Gravity of Sjogrenite =2.10 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Sjogrenite= 5.43 barns/electron
U=PE_Sjogrenite x rElectron Density= 11.65 barns/cc.

Radioactivity:

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

Sjogrenite Classification

Dana Class:

16b.06.01.03 (16b)Carbonates - Hydroxyl or Halogen

(16b.06)Dana Type

(16b.06.01)Sjorgrenite-Hydrotalcite Group (Sojogrenite Subgroup:Hexagonal)

16b.06.01.01 Manasseite Mg6Al2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

16b.06.01.02 Barbertonite Mg6Cr2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

16b.06.01.03 Sjogrenite Mg6Fe2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

16b.06.01.04 Zaccagnaite! Zn4Al2(OH)12(CO3)•3(H2O) P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

05.DA.45 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DA -With medium-sized cations

05.DA.45 Brugnatellite Mg6Fe(CO3)(OH)13•4(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Barbertonite Mg6Cr2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Chlormagaluminite (Mg,Fe)4Al2(OH)12(Cl2,CO3)•2(H2O) P 6/mcm, P 6cm, P 6c2 Hex

05.DA.45 Zaccagnaite! Zn4Al2(OH)12(CO3)•3(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Manasseite Mg6Al2(CO3)(OH)16•4(H2O) P 6₃/mmc 6/m 2/m 2/m

05.DA.45 Sjogrenite Mg6Fe2(CO3)(OH)16•4(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)

See Also:

Links to other databases for Sjogrenite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Sjogrenite

Mg6Fe+++2(CO3)(OH)16•4(H2O)
Dana No: 16b.06.01.03 Strunz No: 05.DA.45
Locality:

Notes: