Melonjosephite Mineral Data

General Melonjosephite Information

Chemical Formula:

CaFe++Fe+++(PO4)2(OH)

Composition:

Molecular Weight = 358.72 gm

Calcium 11.17 % Ca 15.63 % CaO

Iron 31.14 % Fe 20.03 % FeO / 22.26 % Fe₂O₃

Phosphorus 17.27 % P 39.57 % P₂O₅

Hydrogen 0.28 % H 2.51 % H₂O

Oxygen 40.14 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaFe²⁺Fe³⁺(PO₄)₂(OH)

Environment:

Replacing an alluaudite group mineral in a complex granite pegmatite.

IMA Status:

Approved IMA 1973

Locality:

Angarf-Sud pegmatite, Tazenakht Plain, Anti-Atlas Mountains, Morocco. Link to MinDat.org Location Data.

Name Origin:

Named for Joseph Melon (1898-1991), Institute of Mineralogy, University of Liege, Liege, Belgium.

Name Pronunciation:

Melonjosephite + Pronunciation

Synonym:

ICSD 100143

PDF 25-1454

Melonjosephite Crystallography

Axial Ratios:

a:b:c =0.8802:1:0.5881

Cell Dimensions:

a = 9.548, b = 10.847, c = 6.38, Z = 4; V = 660.76 Den(Calc)= 3.61

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbam

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

By Intensity(I/I_o): 3.049(1), 5.418(0.92), 2.709(0.89),

Physical Properties of Melonjosephite

Cleavage:

{110} Perfect, {010} Indistinct

Color:

Dark green, Black.

Density:

3.65

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

5 - Apatite

Luster:

Adamantine - Greasy

Streak:

greenish

Optical Properties of Melonjosephite

Gladstone-Dale:

CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2114,KPDmeas= 0.2091,KC= 0.2216
Ncalc = 1.8 - 1.81

Optical Data:

Biaxial (-), a=1.72, b=1.77, g=1.8, bire=0.0800, 2V(Calc)=72, 2V(Meas)=80-85.

Calculated Properties of Melonjosephite

Electron Density:

Bulk Density (Electron Density)=3.52 gm/cc
note: Specific Gravity of Melonjosephite =3.61 gm/cc.

Fermion Index:

Fermion Index = 0.006944894
Boson Index = 0.993055106

Photoelectric:

PE_{Melonjosephite}= 11.52 barns/electron
U=PE_{Melonjosephite} x rElectron Density= 40.57 barns/cc.

Radioactivity:

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

Melonjosephite Classification

Dana Class:

41.10.05.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.05)Dana Group

41.10.05.01 Melonjosephite CaFeFe(PO4)2(OH) Pbam 2/m 2/m 2/m

Strunz Class:

08.BG.10 08 - PHOSPHATES, ARSENATES, VANADATES

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

08.BG -With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1

08.BG.10 Melonjosephite CaFeFe(PO4)2(OH) Pbam 2/m 2/m 2/m

Other Melonjosephite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Melonjosephite :
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
15 - WWW-MINCRYST

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

Melonjosephite

CaFe++Fe+++(PO4)2(OH)
Dana No: 41.10.05.01 Strunz No: 08.BG.10
Locality:

Notes:

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