Manasseite Mineral Data

General Manasseite Information

Chemical Formula:

Mg6Al2(CO3)(OH)16•4(H2O)

Composition:

Molecular Weight = 603.98 gm

Magnesium 24.14 % Mg 40.04 % MgO

Aluminum 8.93 % Al 16.88 % Al₂O₃

Hydrogen 4.01 % H 35.79 % H₂O

Carbon 1.99 % C 7.29 % CO₂

Oxygen 60.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₆Al₂(CO₃)(OH)₁₆•4(H₂O)

Environment:

In iron ore skarns.

IMA Status:

Valid Species (Pre-IMA) 1941

Locality:

Kongsberg, Norway. Link to MinDat.org Location Data.

Name Origin:

Named for Ernesto Manasse (1875-1922), mineralogist of Florence, Italy.

Name Pronunciation:

Manasseite + Pronunciation

Synonym:

ICSD 82874

PDF 20658

Manasseite Image

Images:

Manasseite

Comments: Brownish yellow crystal of manasseite on dolomite matrix.
Location: Jacupiranga mine, Jacupiranga, Sao Paolo, Brazil. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Manasseite Crystallography

Axial Ratios:

a:c = 1:2.50392

Cell Dimensions:

a = 6.12, c = 15.324, Z = 1; V = 497.06 Den(Calc)= 2.02

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): 7.67(1), 1.84(0.6), 2.6(0.5),

Physical Properties of Manasseite

Cleavage:

{0001} Perfect

Color:

Bluish white, Brownish white, Grayish, White, Light bluish.

Density:

2.05

Diaphaneity:

Transparent

Fracture:

Flexible - Flexible fragments.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Hardness:

2 - Gypsum

Luster:

Pearly

Streak:

white

Optical Properties of Manasseite

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2559,KPDmeas= 0.2522,KC= 0.2521
Ncalc = 1.51 - 1.52

Optical Data:

Uniaxial (-), e=1.51, w=1.524, bire=0.0140.

Calculated Properties of Manasseite

Electron Density:

Bulk Density (Electron Density)=2.12 gm/cc
note: Specific Gravity of Manasseite =2.05 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Manasseite= 0.92 barns/electron
U=PE_Manasseite x rElectron Density= 1.95 barns/cc.

Radioactivity:

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

Manasseite Classification

Dana Class:

16b.06.01.01 (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 Manasseite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Ask about Manasseite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Manasseite Specimen Label here :

Manasseite

Mg6Al2(CO3)(OH)16•4(H2O)
Dana No: 16b.06.01.01 Strunz No: 05.DA.45
Locality:

Notes: