Magniotriplite Mineral Data

Magniotriplite Mineral Data +

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General Magniotriplite Information

Chemical Formula:

(Mg,Fe++,Mn)2(PO4)F

Composition:

Molecular Weight = 187.63 gm

Magnesium 15.54 % Mg 25.78 % MgO

Manganese 5.86 % Mn 7.56 % MnO

Iron 17.86 % Fe 22.97 % FeO

Phosphorus 16.51 % P 37.83 % P₂O₅

Oxygen 34.11 % O

Fluorine 10.13 % F 10.13 % F

- % F -4.26 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_1.2Fe²⁺_0.6Mn²⁺_0.2(PO₄)F

Environment:

Magniotriplite and wagnerite are polytypes, not polymorphs, of one another. The name wagnerite has priority (1821 vs. 1951 for magniotriplite).

IMA Status:

Discredited IMA 2003

Locality:

Tukestan ridge, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named in 1951 for its relationship to triplite. Magniotriplite discredited 2003

Synonym:

Discredited

ICSD 41689

PDF 42-582

Magniotriplite Image

Images:

Magniotriplite

Comments: Red-brown crystalline magniotriplite masses in pegmatite.
Location: Kyrk-Bulak pegmatite, Turkestanskij Range, Os, Kyrgyzstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magniotriplite Crystallography

Axial Ratios:

a:b:c =0.9334:1:0.7564

Cell Dimensions:

a = 11.92, b = 12.77, c = 9.66, Z = 16; beta = 107.18° V = 1,404.82 Den(Calc)= 3.55

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 2.97(1), 3.14(1), 3.33(1),

Crystal Structure:

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Tadini C , Bulletin de Mineralogie , 104 (1981) p.677-680, Magniotriplite: its crystal structure and relation to the triplite-triploidite group, Locality: a pegmatite of the Valmy, Alberes massif, Pyrenees, France

Physical Properties of Magniotriplite

Cleavage:

[001] Good, [010] Distinct, [100] Indistinct

Color:

Reddish brown.

Density:

3.57

Hardness:

5-5.5 - Apatite-Knife Blade

Optical Properties of Magniotriplite

Gladstone-Dale:

CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1832,KPDmeas= 0.1822,KC= 0.1836

Optical Data:

Biaxial (+), a=1.641, b=1.649, g=1.661, bire=0.0200, 2V(Calc)=80, 2V(Meas)=60.

Calculated Properties of Magniotriplite

Electron Density:

r_electron=3.44 gm/cc
note: r_{Magniotriplite}=3.55 gm/cc.

Fermion Index

Fermion Index = 0.01949
Boson Index = 0.98051

Photoelectric:

PE_{Magniotriplite}= 8.03 barns/electron
U=PE_{Magniotriplite} x r_electron= 27.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magniotriplite is Not Radioactive

Magniotriplite Classification

Dana Class:

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

(41.6)where (A)2 (XO4) Zq

(41.6.1)Dana Group

41.6.1.1 Zwieselite (Fe,Mn)2(PO4)F I2/a 2/m

41.6.1.2 Triplite (Mn,Fe,Mg,Ca)2(PO4)(F,OH) I2/m 2/m

41.6.1.3 Magniotriplite ? (Mg,Fe,Mn)2(PO4)F P 2₁/a 2/m

Strunz Class:

VII/B.03-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.03 - Wagnerite - Sarkinite series

VII/B.03-10 Wagnerite (Mg,Fe)2(PO4)F P 2₁/a 2/m

VII/B.03-20 Magniotriplite (Mg,Fe,Mn)2(PO4)F P 2₁/a 2/m

VII/B.03-30 Zwieselite (Fe,Mn)2(PO4)F I2/a 2/m

VII/B.03-40 Triplite (Mn,Fe,Mg,Ca)2(PO4)(F,OH) I2/m 2/m

VII/B.03-50 Wolfeite (Fe,Mn)2(PO4)(OH) P 2₁/a 2/m

VII/B.03-60 Triploidite (Mn,Fe)2(PO4)(OH) P 2₁/a 2/m

VII/B.03-65 Stanekite! Fe(Mn,Fe,Mg)(PO4)O P 2₁/a 2/m

VII/B.03-70 Sarkinite Mn2(AsO4)(OH) P 2₁/a 2/m

Other Magniotriplite Information

References:

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

See Also:

Links to other databases for Magniotriplite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Magniotriplite

(Mg,Fe++,Mn)2(PO4)F
Dana No: 41.6.1.3 Strunz No: VII/B.03-20
Locality:

Notes: