Mineralogy Database

Ronneburgite Mineral Data

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General Ronneburgite Information

Help on Chemical  Formula: Chemical Formula: K2MnV4O12
Help on Composition: Composition: Molecular Weight = 521.92 gm
   Potassium  14.23 %  K    17.15 % K2O
   Magnesium   0.47 %  Mg    0.77 % MgO
   Manganese   9.47 %  Mn   12.23 % MnO
   Vanadium   39.04 %  V    69.70 % V2O5
   Oxygen     36.79 %  O
             ______        ______ 
             100.00 %       99.85 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K1.9Mn2+0.9Mg0.1V5+4O12
Help on Environment: Environment: Low-temperature alteration product formed under oxidizing conditions with a pH neutral to slightly basic.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Ronneburg U deposit dump, near Gera, Thuringia, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Locality.
Help on Synonym: Synonym: IMA1998-069

Ronneburgite Image

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Comments: Reddish-brown crystals of ronneburgite on matrix.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Ronneburgite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8849:1:0.9355
Help on Cell Dimensions: Cell Dimensions: a = 8.183, b = 9.247, c = 8.651, Z = 2; beta = 109.74° V = 616.14 Den(Calc)= 2.81
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.336(1)(121), 2.752(0.68)(222), 2.878(0.64)(103), 3.701(0.55)(211), 3.118(0.5)(122), 3(0.36)(112), 5.509(0.32)(111), 1.86(0.28)

Physical Properties of Ronneburgite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Reddish brown.
Help on Density: Density: 2.84
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Irregular - Very brittle fracture producing irregular fragments
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: brownish orange

Optical Properties of Ronneburgite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.138 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.151 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3408,KPDmeas= 0.3372,KC= 0.2962
Ncalc = 1.83 - 1.84
Help on Optical Data: Optical Data: Biaxial (-), a=1.925, b=1.96, g=1.988, bire=0.0630

Calculated Properties of Ronneburgite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.70 gm/cc
note: Specific Gravity of Ronneburgite =2.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.001635376
Boson Index = 0.998364624
Help on Photoelectric: Photoelectric: PERonneburgite = 11.50 barns/electron
U=PERonneburgite x relectron= 31.02 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 195.02 (Gamma Ray American Petroleum Institute Units)
Concentration of Ronneburgite per GRapi unit = 0.51 (%)

Estimated Radioactivity from Ronneburgite - barely detectable


Ronneburgite Classification

Help on  Dana Class: Dana Class: (47)Vanadium Oxysalts
  (47.01)(Normal VO3)
  (47.01.05)Dana Group Ronneburgite! K2MnV4O12 P 21/n 2/m
Help on  Strunz Class: Strunz Class: 08.AC.75 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
08.AC.75 Ronneburgite! K2MnV4O12 P 21/n 2/m

Other Ronneburgite Information

Help on References: References: NAME( AmMin, Vol 86, p1081-1086) PHYS. PROP.(AmMin, Vol 86, p1081-1086) OPTIC PROP.(AmMin, Vol 86, p1081-1086)
Help on See Also: See Also: Links to other databases for Ronneburgite :
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: 08.AC.75





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