Ronneburgite Mineral Data

General Ronneburgite Information

Chemical Formula:

K2MnV4O12

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

Empirical Formula:

K_1.9Mn²⁺_0.9Mg_0.1V⁵⁺₄O₁₂

Environment:

Low-temperature alteration product formed under oxidizing conditions with a pH neutral to slightly basic.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Ronneburg U deposit dump, near Gera, Thuringia, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the Locality.

Synonym:

IMA1998-069

Ronneburgite Image

Images:

Ronneburgite

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

Axial Ratios:

a:b:c =0.8849:1:0.9355

Cell Dimensions:

a = 8.183, b = 9.247, c = 8.651, Z = 2; beta = 109.74° V = 616.14 Den(Calc)= 2.81

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/I_o): 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

Cleavage:

{???} Indistinct

Color:

Reddish brown.

Density:

2.84

Diaphaneity:

Translucent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luster:

Adamantine

Streak:

brownish orange

Optical Properties of Ronneburgite

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

Optical Data:

Biaxial (-), a=1.925, b=1.96, g=1.988, bire=0.0630

Calculated Properties of Ronneburgite

Electron Density:

Bulk Density (Electron Density)=2.70 gm/cc
note: Specific Gravity of Ronneburgite =2.84 gm/cc.

Fermion Index:

Fermion Index = 0.001635376
Boson Index = 0.998364624

Photoelectric:

PE_Ronneburgite= 11.50 barns/electron
U=PE_Ronneburgite x r_electron= 31.02 barns/cc.

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

Dana Class:

47.01.05.01 (47)Vanadium Oxysalts

(47.01)(Normal VO3)

(47.01.05)Dana Group

47.01.05.01 Ronneburgite! K2MnV4O12 P 2₁/n 2/m

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

References:

NAME( AmMin, Vol 86, p1081-1086) PHYS. PROP.(AmMin, Vol 86, p1081-1086) OPTIC PROP.(AmMin, Vol 86, p1081-1086)

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

Search for Ronneburgite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ronneburgite :

Ask about Ronneburgite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Ronneburgite Specimen Label here :

Ronneburgite

K2MnV4O12
Dana No: 47.01.05.01 Strunz No: 08.AC.75
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.