Ferromerrillite Mineral Data

General Ferromerrillite Information

Chemical Formula:

Ca9NaFe(PO4)7

Composition:

Molecular Weight = 1,095.41 gm

Sodium 1.09 % Na 1.47 % Na₂O

Calcium 33.29 % Ca 46.59 % CaO

Magnesium 0.44 % Mg 0.74 % MgO

Manganese 0.35 % Mn 0.45 % MnO

Iron 4.13 % Fe 5.31 % FeO

Phosphorus 19.79 % P 45.35 % P₂O₅

Oxygen 40.90 % O

______ ______

100.00 % 99.91 % = TOTAL OXIDE

Empirical Formula:

Ca_9.1Na_0.52Fe²⁺_0.81Mg_0.2Mn²⁺_0.07(PO₄)₇

Environment:

Whitlockite group.

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Shergotty meteorite, Gaya, Bihar, India. Link to MinDat.org Location Data.

Name Origin:

Named as the Fe analog of merrillite.

Synonym:

IMA2006-039

Merrillite-Fe

Ferromerrillite Image

Images:

Ferromerrillite

Comments: Polished section grain mount of ferromerrillite with analysis..
Location: Meteorite Los Angeles, Shergotite, Martian basalt. Scale: See Image.
© Diederik Visser

Ferromerrillite Crystallography

Axial Ratios:

a:c = 1:3.58821

Cell Dimensions:

a = 10.372, c = 37.217, Z = 6; V = 3,467.35 Den(Calc)= 3.15

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3c

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

By Intensity(I/I_o): 2.86(1), 3.19(0.6), 2.594(0.5),1.917(0.2), 2.747(0.2), 2.99(0.2), 6.42(0.2), 8.13(0.2),

Physical Properties of Ferromerrillite

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Optical Properties of Ferromerrillite

Optical Data:

NCalc= 1.62 - from Gladstone-Dale relationship (KC = 0.196) where Ncalc=Dcalc*KC+1

Calculated Properties of Ferromerrillite

Electron Density:

Bulk Density (Electron Density)=3.12 gm/cc
note: Specific Gravity of Ferromerrillite =3.15 gm/cc.

Fermion Index:

Fermion Index = 0.0019650188
Boson Index = 0.9980349812

Photoelectric:

PE_{Ferromerrillite}= 6.38 barns/electron
U=PE_{Ferromerrillite} x rElectron Density= 19.90 barns/cc.

Radioactivity:

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

Ferromerrillite Classification

Dana Class:

38.03.04.06 (38)Anhydrous Phosphates, etc

(38.03)(A+ B++)3 (XO4)2

(38.03.04)Whitlockite group

38.03.04.01 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m

38.03.04.02 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m

38.03.04.03 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m

38.03.04.04 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m

38.03.04.05 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m

38.03.04.06 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m

38.03.04.07 Tuite! Ca3(PO4)2 R 3m 3m

38.03.04.08 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m

Strunz Class:

08.AC.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.45 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m

08.AC.45 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m

08.AC.45 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m

08.AC.45 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m

08.AC.45 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m

08.AC.45 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m

08.AC.45 Tuite! Ca3(PO4)2 R 3m 3m

08.AC.45 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m

Other Ferromerrillite Information

See Also:

Links to other databases for Ferromerrillite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Ferromerrillite

Ca9NaFe(PO4)7
Dana No: 38.03.04.06 Strunz No: 08.AC.45
Locality:

Notes: