Takanelite Mineral Data

General Takanelite Information

Chemical Formula:

(Mn++,Ca)Mn++++4O8•(H2O)

Composition:

Molecular Weight = 419.21 gm

Calcium 0.96 % Ca 1.34 % CaO

Manganese 64.21 % Mn 15.23 % MnO / 82.95 % MnO₂

Hydrogen 0.48 % H 4.30 % H₂O

Oxygen 34.35 % O

______ ______

100.00 % 103.82 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.9Ca_0.1Mn⁴⁺₄O₈•(H₂O)

Environment:

Oxidation zone of a braunite-rhodochrosite-Carpopilite deposit.

IMA Status:

Approved IMA 1971

Locality:

Nomura mine, Ehime, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Katsutoshi Takane (1899-1945), professor of mineralogy, Tohoku University, Sendai, Japan.

Name Pronunciation:

Takanelite + Pronunciation

Synonym:

Wad

Takanelite Crystallography

Axial Ratios:

a:c = 1:1.03686

Cell Dimensions:

a = 8.68, c = 9, Z = 3; V = 587.24 Den(Calc)= 3.56

Crystal System:

Hexagonal Space Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.25(1), 3.619(0.25), 2.451(0.2),

Physical Properties of Takanelite

Cleavage:

None

Color:

Brownish gray, Black, Steel gray.

Density:

3.41 - 3.425, Average = 3.41

Diaphaneity:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Sub Metallic

Streak:

brown black

Optical Properties of Takanelite

Optical Data:

NCalc= 2.33 - from Gladstone-Dale relationship (KC = 0.3742) where Ncalc=Dcalc*KC+1
NCalc= 2.28 - from Gladstone-Dale relationship (KC = 0.3742) where Ncalc=Dmeas*KC+1

Calculated Properties of Takanelite

Electron Density:

Bulk Density (Electron Density)=3.37 gm/cc
note: Specific Gravity of Takanelite =3.56 gm/cc.

Fermion Index:

Fermion Index = 0.0001785012
Boson Index = 0.9998214988

Photoelectric:

PE_Takanelite= 16.91 barns/electron
U=PE_Takanelite x rElectron Density= 57.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Takanelite is Not Radioactive

Takanelite Classification

Dana Class:

07.10.01.02 (07)Multiple Oxides

(07.10)Dana Type

(07.10.01)Dana Group

07.10.01.01 Rancieite (Ca,Mn)Mn4O9•3(H2O) Unk Hex

07.10.01.02 Takanelite (Mn,Ca)Mn4O8•(H2O) Unk Hex

Strunz Class:

04.FL.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FL -Hydroxides with H2O ï¿½ (OH); sheets of edge-sharing octahedra

04.FL.40 Takanelite (Mn,Ca)Mn4O8•(H2O) Unk Hex

04.FL.40 Rancieite (Ca,Mn)Mn4O9•3(H2O) Unk Hex

Other Takanelite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Takanelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Takanelite using:

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

Visit our Advertisers for Takanelite :

Ask about Takanelite 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 Takanelite Specimen Label here :

Takanelite

(Mn++,Ca)Mn++++4O8•(H2O)
Dana No: 07.10.01.02 Strunz No: 04.FL.40
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.