Mineralogy Database

Chondrodite Mineral Data

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General Chondrodite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe++)5(SiO4)2(F,OH)2
Help on Composition: Composition: Molecular Weight = 382.12 gm
   Magnesium  23.85 %  Mg   39.55 % MgO
   Iron       18.27 %  Fe   23.50 % FeO
   Silicon    14.70 %  Si   31.45 % SiO2
   Hydrogen    0.13 %  H     1.18 % H2O
   Oxygen     35.59 %  O
   Fluorine    7.46 %  F     7.46 % F
                -   %   F    -3.14 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg3.75Fe2+1.25(SiO4)2F1.5(OH)0.5
Help on Environment: Environment: Contact metamorphic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1817
Help on Locality: Locality: Wunsiedel and Passau, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek chondros - "grain."
Help on Name Pronunciation: Name Pronunciation: Chondrodite + Pronunciation Say CHONDRODITE
Help on Synonym: Synonym: Fluosiderite - F-rich chondrodite
  ICSD 15180
  PDF 12-527

Chondrodite Image

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Comments: Lustrous and semi-transparent crystal of reddish brown chondrodite 1 cm in size with magnetite and muscovite.
Location: Palabora mine, Loolekop, Phalaborwa, Limpopo Province, South Africa. Scale: 4 x 2.6 x 2.4 cm.
© John Betts - Fine Minerals

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  Warwickite   Chondrodite

Comments: Black crystalline warwickite with tan chondrodite in white marble.
Location: Amity, near Warwick, Orange County, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chondrodite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.6638:1:2.1712
Help on Cell Dimensions: Cell Dimensions: a = 7.87, b = 4.73, c = 10.27, Z = 2; beta = 109.033° V = 361.40 Den(Calc)= 3.51
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.252(1), 2.272(1), 1.737(0.95),

Physical Properties of Chondrodite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Yellow, Orange, Brownish white, Reddish white, Greenish white.
Help on Density: Density: 3.1 - 3.2, Average = 3.15
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luminescence: Luminescence: Fluorescent, Short UV=orange yellow, Long UV=orange.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: gray

Optical Properties of Chondrodite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.084 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1798,KPDmeas= 0.2003,KC= 0.1962
Ncalc = 1.61 - 1.69
Help on Optical Data: Optical Data: Biaxial (+), a=1.592-1.643, b=1.602-1.655, g=1.619-1.675, bire=0.0270-0.0320, 2V(Calc)=76-78, 2V(Meas)=64-90. Dispersion weak to moderate, r > v.
Help on Pleochroism (x): Pleochroism (x): yellowish brown, deep chrome yellow, reddish brown, or brownish yellow.
Help on Pleochroism (y): Pleochroism (y): pale yellowish brown, yellow, pale reddish brown, or yellowish green.

Calculated Properties of Chondrodite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Chondrodite =3.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEChondrodite = 6.55 barns/electron
U=PEChondrodite x rElectron Density= 20.25 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chondrodite is Not Radioactive

Chondrodite Classification

Help on  Dana Class: Dana Class: 52.03.02b.02 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.02b)Humite group (Chondrodite series)
52.03.02b.01 Alleghanyite Mn5(SiO4)2(OH)2 P 21/a 2/m
52.03.02b.02 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 21/c 2/m
52.03.02b.03 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 21/a 2/m
52.03.02b.04 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m
52.03.02b.05 Kumtyubeite! Ca5(SiO4)2F2 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.AF.45 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.45 Alleghanyite Mn5(SiO4)2(OH)2 P 21/a 2/m
09.AF.45 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 21/c 2/m
09.AF.45 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 21/a 2/m
09.AF.45 Kumtyubeite! Ca5(SiO4)2F2 P 21/a 2/m

Other Chondrodite Information

Help on See Also: See Also: Links to other databases for Chondrodite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - Franklin Minerals(Palache)
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - HyperPhysics
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - Scandinavian mineral gallery
20 - University of Colorado - Mineral Structure Data

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Dana No: 52.03.02b.02 Strunz No: 09.AF.45





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