Mineralogy Database

Rondorfite Mineral Data

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General Rondorfite Information

Help on Chemical  Formula: Chemical Formula: Ca8Mg(SiO4)4Cl2
Help on Composition: Composition: Molecular Weight = 782.89 gm
   Sodium      0.06 %  Na    0.08 % Na2O
   Calcium    41.41 %  Ca   57.95 % CaO
   Magnesium   2.76 %  Mg    4.58 % MgO
   Titanium    0.06 %  Ti    0.10 % TiO2
   Aluminum    0.21 %  Al    0.39 % Al2O3
   Iron        0.43 %  Fe    0.55 % FeO
   Silicon    14.49 %  Si   31.01 % SiO2
   Hydrogen    0.04 %  H     0.33 % H2O
   Chlorine    6.84 %  Cl    6.84 % Cl
                -   %   Cl   -1.54 % -O=Cl2   
   Oxygen     33.70 %  O
             ______        ______ 
             100.00 %      100.29 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca8.09Na0.02Mg0.89Al0.06Fe2+0.06Si4.04Ti0.01O16.2Cl1.51(OH)0.29
Help on Environment: Environment: In xenoliths in leucite tephrite lava.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: A quarry at the Bellerberg volcano lava field, near Ettringen, 2 km north of Mayen, Laacher See region, eastern Eifel area, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alice and Eugen Rondorf, two distinguished mineral collectors, who found the mineral with Bernd Ternes in 1979.
Help on Synonym: Synonym: IMA1997-013

Rondorfite Image

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Comments: Brown to orange, shiny, massive rondorfite in matrix.
Location: Bellerberg, Eifel, Germany. Scale: Not Given.
© Diederik Visser

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  Kumtyubeite   Srebrodolskite   Wadalite   Rondorfite

Comments: BSE image of kumtyubeite (Kmt) associated with srebrodolskite (Srb), bultfonteinite (Blt), Ca- kydrosilicates, wadalite (Wad), rondorfite (Rndr), and ettringite (dark gray). (AmMin, v94:1361).
Location: Rock-forming mineral found in skarn carbonate-xenoliths in ignimbrites of the Upper Chegem volcanic structure, Kabardino-Balkaria, Northern Caucasus, Russia. Scale: See Image.
© American Mineralogist

Rondorfite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 15.085, Z = 8; V = 3,432.70 Den(Calc)= 3.03
Help on Crystal System: Crystal System: Isometric - Diploidal H-M Symbol (2/m 3) Space Group: F d3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.666(1)(440), 1.54(0.5)(844), 2.901(0.4)(511),1.4959(0.3)(951), 1.777(0.3)(822), 1.885(0.3)(800), 1.964(0.3)(553),

Physical Properties of Rondorfite

Help on Color: Color: Orange brown, Amber brown.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light amber

Optical Properties of Rondorfite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2211,KC= 0.2205
Ncalc = 1.67
Help on Optical Data: Optical Data: Isotropic, n=1.67.

Calculated Properties of Rondorfite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Rondorfite =3.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PERondorfite = 6.28 barns/electron
U=PERondorfite x rElectron Density= 18.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rondorfite is Not Radioactive

Rondorfite Classification

Help on  Dana Class: Dana Class: (51)Nesosilicate Insular SiO4 Groups Only
  (51.04)with cations in [6] and >[6] coordination
  (51.04.06)Dana Group Rondorfite! Ca8Mg(SiO4)4Cl2 F d3 2/m 3
Help on  Strunz Class: Strunz Class: 09.AB.20 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AB -Nesosilicates without additional anions;
09.AB.20 Rondorfite! Ca8Mg(SiO4)4Cl2 F d3 2/m 3

Other Rondorfite Information

Help on References: References: NAME( CanMin, 42:1283) PHYS. PROP.(CanMin, 42:1283) OPTIC PROP.(CanMin, 42:1283)
Help on See Also: See Also: Links to other databases for Rondorfite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.AB.20





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