Mineralogy Database

Friedelite Mineral Data

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General Friedelite Information

Help on Chemical  Formula: Chemical Formula: Mn8Si6O15(OH,Cl)10
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+8Si6O15(OH)7.5Cl2.5
Help on Environment: Environment: Metamorphosed manganese ore deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1876
Help on Locality: Locality: Adervielle, Hautes Pyrenees, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Charles Friedel (1832-1899), French chemist and mineralogist.
Help on Name Pronunciation: Name Pronunciation: Friedelite + Pronunciation Say FRIEDELITE

Friedelite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.7415:1:0.5559
Help on Cell Dimensions: Cell Dimensions: a = 23.33, b = 13.396, c = 7.447, Z = 4; beta = 105.08° V = 2,247.25 Den(Calc)= 3.15
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.56(1), 7.17(0.9), 3.6(0.7),

Physical Properties of Friedelite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Brown, Brown red, Yellow, Light pink, Dark red.
Help on Density: Density: 3.07
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: pink

Optical Properties of Friedelite

Help on Gladstone-Dale: 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
Ncalc = 1.69 - 1.7
Help on Optical Data: Optical Data: Biaxial (?), a=1.63, b=1.66, g=1.66, bire=0.0300

Calculated Properties of Friedelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Friedelite =3.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0075582793
Boson Index = 0.9924417207
Help on Photoelectric: Photoelectric: PEFriedelite = 11.74 barns/electron
U=PEFriedelite x rElectron Density= 34.83 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Friedelite is Not Radioactive

Friedelite Classification

Help on  Dana Class: Dana Class: 72.04.01b.01 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.04)with 4-, 6-, and 12-membered rings
  (72.04.01b)Pyrosmalite group (Friedelite subgroup)
72.04.01b.01 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m
72.04.01b.02 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m
72.04.01b.03 Nelenite (Mn,Fe)16Si12As3O36(OH)17 R 3m 3 2/m
Help on  Strunz Class: Strunz Class: 09.EE.10 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.10 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 63mc 6mm
09.EE.10 Friedelite Mn8Si6O15(OH,Cl)10 C 2/m 2/m
09.EE.10 Mcgillite (Mn,Fe)8Si6O15(OH)8Cl2 C 2/m 2/m
09.EE.10 Pyrosmalite-(Fe) (Fe,Mn)8Si6O15(OH,Cl)10 P 3m1 3 2/m
09.EE.10 Pyrosmalite-(Mn) (Mn,Fe)8Si6O15(OH,Cl)10 P 3m1 3 2/m

Other Friedelite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Friedelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: 72.04.01b.01 Strunz No: 09.EE.10





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