Richellite Mineral Data

General Richellite Information

Chemical Formula:

Ca3Fe+++10(PO4)8(OH)12•n(H2O)

Composition:

Molecular Weight = 1,660.58 gm

Calcium 7.24 % Ca 10.13 % CaO

Iron 33.63 % Fe 48.08 % Fe₂O₃

Phosphorus 14.92 % P 34.19 % P₂O₅

Hydrogen 0.85 % H 7.59 % H₂O

Oxygen 43.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Fe³⁺₁₀(PO₄)₈(OH)₁₂•(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1884

Locality:

Richelle, near Vise in Liege, Balgium. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Richellite + Pronunciation

Richellite Image

Images:

Richellite

Comments: Khaki-colored earthy richellite masses.
Location: Richelle, near Vise, Liege, Belgium. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Richellite Crystallography

Axial Ratios:

a:c = 1:2.43436

Cell Dimensions:

a = 5.18, c = 12.61, Z = 0.25; V = 338.36 Den(Calc)= 2.04

Crystal System:

Tetragonal - PyramidalH-M Symbol (4) Space Group: P 4

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

By Intensity(I/I_o): 3.24(1), 1.59(0.8), 3.58(0.65),

Physical Properties of Richellite

Color:

Yellow brown, Reddish brown.

Density:

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Greasy (Oily)

Streak:

yellowish brown

Optical Properties of Richellite

Optical Data:

NCalc= 1.53 - from Gladstone-Dale relationship (KC = 0.2611) where Ncalc=Dcalc*KC+1
NCalc= 1.52 - from Gladstone-Dale relationship (KC = 0.2611) where Ncalc=Dmeas*KC+1

Calculated Properties of Richellite

Electron Density:

Bulk Density (Electron Density)=2.00 gm/cc
note: Specific Gravity of Richellite =2.04 gm/cc.

Fermion Index:

Fermion Index = 0.0074369176
Boson Index = 0.9925630824

Photoelectric:

PE_Richellite= 11.63 barns/electron
U=PE_Richellite x rElectron Density= 23.26 barns/cc.

Radioactivity:

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

Richellite Classification

Dana Class:

42.13.02.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.13)Dana Type

(42.13.02)Dana Group

42.13.02.01 Richellite Ca3Fe10(PO4)8(OH)12•n(H2O) P 4 4

Strunz Class:

08.BB.90 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BB -With only medium-sized cations, (OH, etc.):RO4 £ 1:1

08.BB.90 Lipscombite (Fe,Mn)Fe2(PO4)2(OH)2 P 4₁2₁2 4 2 2

08.BB.90 Richellite Ca3Fe10(PO4)8(OH)12•n(H2O) P 4 4

08.BB.90 Zinclipscombite! ZnFe2(PO4)2(OH) P 4₃2₁2 or P 4₁2₁2 4 2 2

Other Richellite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Richellite :
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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Print or Cut-and-Paste your Richellite Specimen Label here :

Richellite

Ca3Fe+++10(PO4)8(OH)12•n(H2O)
Dana No: 42.13.02.01 Strunz No: 08.BB.90
Locality:

Notes: