Ferrorosemaryite Mineral Data

General Ferrorosemaryite Information

Chemical Formula:

[ ]NaFe++Fe+++Al(PO4)3

Composition:

Molecular Weight = 454.58 gm

Sodium 2.12 % Na 2.86 % Na₂O

Calcium 0.35 % Ca 0.49 % CaO

Magnesium 0.11 % Mg 0.18 % MgO

Manganese 6.28 % Mn 8.11 % MnO

Aluminum 4.87 % Al 9.20 % Al₂O₃

Iron 23.59 % Fe 11.22 % FeO / 21.25 % Fe₂O₃

Phosphorus 20.44 % P 46.84 % P₂O₅

Oxygen 42.24 % O

______ ______

100.00 % 100.16 % = TOTAL OXIDE

Empirical Formula:

Na_0.42Mn²⁺_0.28Ca_0.04Fe²⁺_0.71Mn²⁺_0.24Fe³⁺_0.05Fe³⁺Al_0.82Fe³⁺_0.16Mg_0.02(PO₄)₃

Environment:

Found in embedded in scorzalite from cotan-bearing pegmatites that cut across dark-gray schists and quartzites of the Mesoproterozoic Kibuye formation. Wyllieite group.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Rubindi-Kabilizi pegmatite, located 3 km WNW of Muhororo village, south of the Rubindi river, 50 km west of Kigali, Rwanda. Link to MinDat.org Location Data.

Name Origin:

Named as the Fe-dominant analogue of rosemaryite.

Synonym:

IMA2003-063

Ferrorosemaryite Image

Images:

Ferrorosemaryite

Comments: B&W PPL image of idiomorphic, semi-opague grains of ferrorosemaryite in white scorzalite. (Eur J Mineralogy, v17:749.
Location: Rubindi pegmatite, Rwanda. Scale: See Image.
© Eur. J. Mineral

Ferrorosemaryite Crystallography

Axial Ratios:

a:b:c =0.9587:1:0.51

Cell Dimensions:

a = 11.838, b = 12.347, c = 6.2973, Z = 4; beta = 114.353° V = 838.54 Den(Calc)= 3.60

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 2.677(1)(240 ), 2.693(0.75)(400 ), 3.448(0.65)(310 ),6.167(0.5)(020 ), 4.054(0.45)(220 ), 3.011(0.4)(112 ), 5.382(0.4)(200 ), 8.102(0.3)(110 ), 2.468(0.2)(420 ),

Physical Properties of Ferrorosemaryite

Cleavage:

{010} Perfect, {101} Good

Color:

Dark green, Bronze.

Diaphaneity:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

4 - Fluorite

Luster:

Resinous

Streak:

greenish brown

Optical Properties of Ferrorosemaryite

Gladstone-Dale:

CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2095,KC= 0.2156
Ncalc = 1.78

Optical Data:

Biaxial (-), a=1.73, b=1.758, g=1.775, bire=0.0450, 2V(Calc)=74, 2V(Meas)=82. Dispersion strong, r < v.

Calculated Properties of Ferrorosemaryite

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Ferrorosemaryite =3.60 gm/cc.

Fermion Index:

Fermion Index = 0.0053151001
Boson Index = 0.9946848999

Photoelectric:

PE_{Ferrorosemaryite}= 9.89 barns/electron
U=PE_{Ferrorosemaryite} x rElectron Density= 34.51 barns/cc.

Radioactivity:

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

Ferrorosemaryite Classification

Dana Class:

38.02.04.07 (38)Anhydrous Phosphates, etc

(38.02)(A+ B++)5 (XO4)3

(38.02.04)Alluaudite-Wyllieite Group (Wyllieite Subgroup)

38.02.04.01 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.02.04.02 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.02.04.03 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.02.04.04 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 2₁/n 2/m

38.02.04.05 Bobfergusonite Na2Mn5FeAl(PO4)6 P 2₁/n 2/m

38.02.04.06 Bradaczekite! NaCu4(AsO4)3 C 2/c 2/m

38.02.04.07 Ferrorosemaryite! []NaFeFeAl(PO4)3 P 2₁/n 2/m

Strunz Class:

08.AC.15 08 - PHOSPHATES, ARSENATES, VANADATES

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

08.AC -With medium-sized and large cations

08.AC.15 Bobfergusonite Na2Mn5FeAl(PO4)6 P 2₁/n 2/m

08.AC.15 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

08.AC.15 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 2₁/n 2/m

08.AC.15 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

08.AC.15 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

08.AC.15 Ferrorosemaryite! []NaFeFeAl(PO4)3 P 2₁/n 2/m

Other Ferrorosemaryite Information

References:

NAME( AmMin, v91, p1203) PHYS. PROP.(AmMin, v91, p1203) OPTIC PROP.(AmMin, v91, p1203)

See Also:

Links to other databases for Ferrorosemaryite :
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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Ferrorosemaryite

[ ]NaFe++Fe+++Al(PO4)3
Dana No: 38.02.04.07 Strunz No: 08.AC.15
Locality:

Notes:

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