Manganhumite Mineral Data

Manganhumite Mineral Data +

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General Manganhumite Information

Chemical Formula:

(Mn,Mg)7(SiO4)3(OH)2

Composition:

Molecular Weight = 641.22 gm

Magnesium 6.63 % Mg 11.00 % MgO

Manganese 44.98 % Mn 58.08 % MnO

Silicon 13.14 % Si 28.11 % SiO₂

Hydrogen 0.31 % H 2.81 % H₂O

Oxygen 34.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_5.25Mg_1.75(SiO₄)₃(OH)₂

IMA Status:

Approved IMA 1978

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 200351

PDF 29-866

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Manganhumite Crystallography

Axial Ratios:

a:b:c =0.4551:1:2.0272

Cell Dimensions:

a = 4.815, b = 10.58, c = 21.448, Z = 4; V = 1,092.62 Den(Calc)= 3.90

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

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

By Intensity(I/I_o): 1.7823(1), 3.393(0.89), 2.513(0.79),

Crystal Structure:

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Francis C A , Ribbe P H , American Mineralogist , 63 (1978) p.874-877, Crystal structures of the humite minerals: V. Magnesian manganhumite

Physical Properties of Manganhumite

Cleavage:

[010] Perfect

Color:

Brown, Brown orange, Light orange.

Density:

3.83

Diaphaniety:

Transparent to Translucent

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Manganhumite

Gladstone-Dale:

CI meas= 0.088 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.104 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1831,KPDmeas= 0.1864,KC= 0.2044

Optical Data:

Biaxial (+), a=1.707, b=1.712, g=1.723, bire=0.0160, 2V(Calc)=70, 2V(Meas)=37.

Calculated Properties of Manganhumite

Electron Density:

r_electron=3.68 gm/cc
note: r_Manganhumite=3.83 gm/cc.

Fermion Index

Fermion Index = 0.01293
Boson Index = 0.98707

Photoelectric:

PE_Manganhumite= 12.22 barns/electron
U=PE_Manganhumite x r_electron= 45.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganhumite is Not Radioactive

Manganhumite Classification

Dana Class:

52.3.2c.3 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.3)with cations in [6] coordination only

(52.3.2c)Humite group (Humite series)

52.3.2c.1 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m

52.3.2c.2 Leucophoenicite Mn7(SiO4)3(OH)2 P 2₁/a 2/m

52.3.2c.3 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m

Strunz Class:

VIII/B.04-80 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.04 - Humite group

VIII/B.04-10 Norbergite Mg3(SiO4)(F,OH)2 P nma 2/m 2/m 2/m

VIII/B.04-20 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 2₁/c 2/m

VIII/B.04-30 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m

VIII/B.04-40 Clinohumite (Mg,Fe)9(SiO4)4(F,OH)2 P 2₁/c 2/m

VIII/B.04-42 Hydroxylclinohumite! Mg9(SiO4)4(OH,F)2 P 2₁/c 2/m

VIII/B.04-50 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m

VIII/B.04-60 Alleghanyite Mn5(SiO4)2(OH)2 P 2₁/a 2/m

VIII/B.04-70 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 2₁/a 2/m

VIII/B.04-80 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m

VIII/B.04-90 Leucophoenicite Mn7(SiO4)3(OH)2 P 2₁/a 2/m

VIII/B.04-100 Jerrygibbsite (Mn,Zn)9(SiO4)4(OH)2 Pbn21 mm2

VIII/B.04-110 Sonolite Mn9(SiO4)4(OH,F)2 P 2₁/a 2/m

Other Manganhumite Information

References:

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

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Manganhumite

(Mn,Mg)7(SiO4)3(OH)2
Dana No: 52.3.2c.3 Strunz No: VIII/B.04-80
Locality:

Notes: