Friedelite Mineral Data

Friedelite Mineral Data +

General Friedelite Information

Chemical Formula:

Mn8Si6O15(OH,Cl)10

Composition:

Molecular Weight = 1,064.20 gm

Manganese 41.30 % Mn 53.33 % MnO

Silicon 15.83 % Si 33.88 % SiO₂

Hydrogen 0.71 % H 6.35 % H₂O

Chlorine 8.33 % Cl 8.33 % Cl

- % Cl -1.88 % -O=Cl₂

Oxygen 33.83 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₈Si₆O₁₅(OH)_7.5Cl_2.5

Environment:

Metamorphosed manganese ore deposits.

IMA Status:

Valid Species (Pre-IMA) 1876

Locality:

Adervielle, Hautes Pyrenees, France. Link to MinDat.org Location Data.

Name Origin:

Named for Charles Friedel (1832-1899), French chemist and mineralogist.

Friedelite Image

Images:

Friedelite

Comments: Rose red crystals of friedelite on matrix.
Location: Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Friedelite Crystallography

Axial Ratios:

a:b:c =1.7415:1:0.5559

Cell Dimensions:

a = 23.33, b = 13.396, c = 7.447, Z = 4; beta = 105.08° V = 2,247.25 Den(Calc)= 3.15

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.56(1), 7.17(0.9), 3.6(0.7),

Physical Properties of Friedelite

Cleavage:

[010] Perfect

Color:

Brown, Brown red, Yellow, Light pink, Dark red.

Density:

3.07

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

pink

Optical Properties of Friedelite

Gladstone-Dale:

CI meas= 0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.076 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2063,KPDmeas= 0.2117,KC= 0.2234

Optical Data:

Biaxial (?), a=1.63, b=1.66, g=1.66, bire=0.0300

Calculated Properties of Friedelite

Electron Density:

r_electron=2.97 gm/cc
note: r_Friedelite=3.07 gm/cc.

Fermion Index

Fermion Index = 0.00755
Boson Index = 0.99245

Photoelectric:

PE_Friedelite= 11.74 barns/electron
U=PE_Friedelite x r_electron= 34.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Friedelite is Not Radioactive

Friedelite Classification

Dana Class:

72.4.1b.1 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.4)with 4-, 6-, and 12-membered rings

(72.4.1b)Pyrosmalite group (Friedelite subgroup)

72.4.1b.1 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m

72.4.1b.2 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m

72.4.1b.3 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m

Strunz Class:

VIII/H.28-70 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.28 - Pyrosmalite series

VIII/H.28-10 Ferropyrosmalite (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m

VIII/H.28-20 Manganpyrosmalite (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

VIII/H.28-30 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 6₃mc 6mm

VIII/H.28-40 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m

VIII/H.28-50 Schallerite Mn16[AsO2OH][Si12O30](OH)14 P 3m1 ? 3m

VIII/H.28-70 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m

VIII/H.28-80 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m

VIII/H.28-90 Bementite Mn8Si6O15(OH)10 P 2₁/c 2/m

VIII/H.28-100 Varennesite Na8Mn2Si10O25(OH,Cl)2·12(H2O) C mcm 2/m 2/m 2/m

Other Friedelite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Friedelite

Mn8Si6O15(OH,Cl)10
Dana No: 72.4.1b.1 Strunz No: VIII/H.28-70
Locality:

Notes: