Franciscanite-III Mineral Data

Franciscanite-III Mineral Data +

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General Franciscanite-III Information

Chemical Formula:

Mn++6V+++++2Si2(O,OH)14

Composition:

Molecular Weight = 713.69 gm

Manganese 46.19 % Mn 59.64 % MnO

Vanadium 14.28 % V 25.48 % V₂O₅

Silicon 7.87 % Si 16.84 % SiO₂

Hydrogen 0.28 % H 2.52 % H₂O

Oxygen 31.39 % O

______ ______

100.00 % 104.48 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₆V⁵⁺₂Si₂O₁₂(OH)₂

IMA Status:

Approved IMA 1986

Locality:

Pennsylvania mine, SW side of San Antonio Valley, 4 miles ENE of Mount Halilton, Santa Clara Co. California. Link to MinDat.org Location Data.

Name Origin:

Named after the Miocene age Franciscan Formation.

Franciscanite-III Image

Images:

Franciscanite-III

Comments: Dark reddish brown large franciscanite grains to 1.5cm in tan-colored gageite matrix.
Location: Pennsylvania mine, Santa Clara Co., California, USA. Scale: 5.5 x 4 x 3cm.
© Tom Loomis / Dakota Matrix

Franciscanite-III Crystallography

Axial Ratios:

a:c = 1:0.58959

Cell Dimensions:

a = 8.148, c = 4.804, Z = 1; V = 276.21 Den(Calc)= 4.29

Crystal System:

Trigonal - PyramidalH-M Symbol (3) Space Group: P 3

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

By Intensity(I/I_o): 2.331(1), 2.844(0.9), 3.105(0.9),

Physical Properties of Franciscanite-III

Color:

Red.

Density:

4.1

Diaphaniety:

Transparent to Translucent

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Optical Properties of Franciscanite-III

Gladstone-Dale:

CI meas= 0.146 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.184 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2022,KPDmeas= 0.2116,KC= 0.2477

Optical Data:

Uniaxial (+), w=1.859, e=1.876, bire=0.0170.

Calculated Properties of Franciscanite-III

Electron Density:

r_electron=3.88 gm/cc
note: r_{Franciscanite-III}=4.10 gm/cc.

Fermion Index

Fermion Index = 0.00418
Boson Index = 0.99582

Photoelectric:

PE_{Franciscanite-III}= 15.10 barns/electron
U=PE_{Franciscanite-III} x r_electron= 58.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Franciscanite-III is Not Radioactive

Franciscanite-III Classification

Dana Class:

7.3.1.2 (7)Multiple Oxides

(7.3)with 2+ and higher charged cations

(7.3.1)containing Mn (Hexagonal, P3)

7.3.1.1 Welinite-III Mn6(W,Mg)2Si2(O,OH)14 P 3 3

7.3.1.2 Franciscanite-III Mn6V2Si2(O,OH)14 P 3 3

7.3.1.3 Orebroite-III Mn6(Fe,Sb)2Si2(O,OH)14 P 3 3

Strunz Class:

VIII/B.09-10* VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.09 - Braunite - Langbanite - Katoptrite series

VIII/B.09-03 Braunite-I MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-05 Abswurmbachite CuMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-07 Neltnerite CaMn6SiO12 I 4₁/acd 4/m 2/m 2/m

VIII/B.09-10* Franciscanite-III Mn6V2Si2(O,OH)14 P 3 3

VIII/B.09-10 Franciscanite-VIII Mn3(V,[])1-x(SiO4)(O,OH)3(x=0.5) P 3 3

VIII/B.09-12* Orebroite-III Mn6(Fe,Sb)2Si2(O,OH)14 P 3 3

VIII/B.09-12 Orebroite-VIII Mn3(Sb,Fe)SiO4(O,OH)3 P 3 3

VIII/B.09-14* Welinite-III Mn6(W,Mg)2Si2(O,OH)14 P 3 3

VIII/B.09-14 Welinite-VIII (Mn,Mg)3(W,Mn)1-x(SiO4)(O,OH)3(x=1/3) P 3 3

VIII/B.09-17 Langbanite (Mn,Ca,Fe)4(Mn,Fe)9SbSi2O24 C 2/m 2/m

VIII/B.09-20 Yeatmanite Mn9Zn6Sb2Si4O28 P1 1

VIII/B.09-30 Katoptrite (Mn,Mg)13(Al,Fe)4Sb2Si2O28 C 2/m 2/m

Other Franciscanite-III Information

References:

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

See Also:

Links to other databases for Franciscanite-III :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Franciscanite-III

Mn++6V+++++2Si2(O,OH)14
Dana No: 7.3.1.2 Strunz No: VIII/B.09-10*
Locality:

Notes: