Rancieite Mineral Data

Rancieite Mineral Data +

General Rancieite Information

Chemical Formula:

(Ca,Mn++)Mn++++4O9·3(H2O)

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

Empirical Formula:

Ca_0.75Mn²⁺_0.25Mn⁴⁺₄O₉·3(H₂O)

Environment:

In cavities in limonite.

IMA Status:

Valid Species (Pre-IMA) 1859

Locality:

Rancie, near Vicdessos, Ariege, France. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Rancieite Image

Images:

Rancieite

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

Axial Ratios:

a:c = 1:2.62237

Cell Dimensions:

a = 2.86, c = 7.5, Z = 0.22; V = 53.13 Den(Calc)= 3.17

Crystal System:

HexagonalSpace Group: Unk

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

By Intensity(I/I_o): 7.56(1), 3.77(0.2), 2.46(0.12),

Crystal Structure:

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Ertl A , Pertlik F , Prem M , Post J E , Kim S J , Brandstatter F , Schuster R , European Journal of Mineralogy , 17 (2005) p.163-172, Rancieite crystals from Friesach, Carinthia, Austria, Note: Birnessite group, Locality: Friesach, Carinthia, Austria

Physical Properties of Rancieite

Cleavage:

None

Color:

Violet brown, Black, Silver gray.

Density:

3 - 3.2, Average = 3.1

Diaphaniety:

Transparent to Opaque

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic - Dull

Streak:

dark brown

Optical Properties of Rancieite

Optical Data:

NCalc= 2.13 - from Gladstone-Dale relationship (KC = 0.3558) where Ncalc=Dcalc*KC+1
NCalc= 2.1 - from Gladstone-Dale relationship (KC = 0.3558) where Ncalc=Dmeas*KC+1

Calculated Properties of Rancieite

Electron Density:

r_electron=3.07 gm/cc
note: r_Rancieite=3.17 gm/cc.

Fermion Index

Fermion Index = 0.00028
Boson Index = 0.99972

Photoelectric:

PE_Rancieite= 13.83 barns/electron
U=PE_Rancieite x r_electron= 42.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rancieite is Not Radioactive

Rancieite Classification

Dana Class:

7.10.1.1 (7)Multiple Oxides

(7.10)Dana Type

(7.10.1)Dana Group

7.10.1.1 Rancieite (Ca,Mn)Mn4O9·3(H2O) Unk Hex

7.10.1.2 Takanelite (Mn,Ca)Mn4O8·(H2O) Unk Hex

Strunz Class:

IV/D.12-10 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.12 - Rancieite - Takanelite series

IV/D.12-10 Rancieite (Ca,Mn)Mn4O9·3(H2O) Unk Hex

IV/D.12-20 Takanelite (Mn,Ca)Mn4O8·(H2O) Unk Hex

Other Rancieite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Rancieite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Rancieite

(Ca,Mn++)Mn++++4O9·3(H2O)
Dana No: 7.10.1.1 Strunz No: IV/D.12-10
Locality:

Notes: