Mineralogy Database

Rancieite Mineral Data

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General Rancieite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Mn++)Mn++++4O9•3(H2O)
Help on Composition: Composition: Molecular Weight = 461.59 gm
   Calcium     6.51 %  Ca    9.11 % CaO
   Manganese  50.58 %  Mn    3.84 % MnO / 75.34 % MnO2
   Hydrogen    1.31 %  H    11.71 % H2O
   Oxygen     41.59 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.75Mn2+0.25Mn4+4O9•3(H2O)
Help on Environment: Environment: In cavities in limonite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1859
Help on Locality: Locality: Rancie, near Vicdessos, Ariege, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Rancieite + Pronunciation Say RANCIEITE

Rancieite Image

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Comments: Brown resinous rancieite veinlets in limonite / wad rock.
Location: Montmirat, Lozere, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rancieite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.62237
Help on Cell Dimensions: Cell Dimensions: a = 2.86, c = 7.5, Z = 0.22; V = 53.13 Den(Calc)= 3.17
Help on Crystal System: Crystal System: Hexagonal Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.56(1), 3.77(0.2), 2.46(0.12),

Physical Properties of Rancieite

Help on Cleavage: Cleavage: None
Help on Color: Color: Violet brown, Black, Silver gray.
Help on Density: Density: 3 - 3.2, Average = 3.1
Help on Diaphaneity: Diaphaneity: Transparent to Opaque
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Metallic - Dull
Help on Streak: Streak: dark brown

Optical Properties of Rancieite

Help on Optical Data: Optical Data: NCalc= 2.15 - from Gladstone-Dale relationship (KC = 0.3633) where Ncalc=Dcalc*KC+1
NCalc= 2.13 - from Gladstone-Dale relationship (KC = 0.3633) where Ncalc=Dmeas*KC+1

Calculated Properties of Rancieite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.07 gm/cc
note: Specific Gravity of Rancieite =3.17 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002895295
Boson Index = 0.9997104705
Help on Photoelectric: Photoelectric: PERancieite = 13.83 barns/electron
U=PERancieite x rElectron Density= 42.40 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rancieite is Not Radioactive

Rancieite Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.10)Dana Type
  (07.10.01)Dana Group Rancieite (Ca,Mn)Mn4O9•3(H2O) Unk Hex Takanelite (Mn,Ca)Mn4O8•(H2O) Unk Hex
Help on  Strunz Class: 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 � (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 Rancieite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Rancieite :
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

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Dana No: Strunz No: 04.FL.40





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