[Fine Minerals] [What's New] [Mineral Galleries] [My Collection] [Mineral Auctions] Dan Weinrich Fine Minerals Full-time professional mineral dealer with over 31 years experience in mineral collecting And 15 years selling mineral specimens on the internet and at major mineral shows General Franciscanite-VIII InformationMn++3(V+++++,[ ])1-x(SiO4)(O,OH)3(x=0.5) |
Molecular Weight = 331.88 gm |
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Manganese 49.66 % Mn 64.12 % MnO |
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Vanadium 7.67 % V 13.70 % V2O5 |
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Silicon 8.46 % Si 18.10 % SiO2 |
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Hydrogen 0.46 % H 4.07 % H2O |
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Oxygen 33.75 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
Mn2+3V5+0.5(SiO4)O1.5(OH)1.5 |
Irregular segregations within a sheared sonolite-bearing assemblage in chert. |
Approved IMA 1986 |
Pennsylvania mine, SW side of San Antonio Valley, 4 miles ENE of Mount Halilton, Santa Clara Co. California. Link to MinDat.org Location Data. |
Named after the Miocene-aged Franciscan Formation in California, USA.. |
Franciscanite-VIII + Pronunciation |
| | Search for Franciscanite-VIII Images
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| | Franciscanite-VIII Crystallographya:c = 1:0.58959 |
a = 8.148, c = 4.804, Z = 2; V = 276.21 Den(Calc)= 3.99 |
Trigonal - PyramidalH-M Symbol (3) Space Group: P 3 |
By Intensity(I/Io): 2.331(1), 3.105(0.9), 2.844(0.9),1.785(0.7), 1.538(0.5), 2.668(0.4), 3.97(0.3), |
| Physical Properties of Franciscanite-VIIIRed, Reddish brown. |
4.1 |
Transparent to Translucent |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks. |
4 - Fluorite |
Vitreous (Glassy) |
Weakly magnetic |
| Optical Properties of Franciscanite-VIIIwine red or wine red. |
dark red or nearly black. |
CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2176,KPDmeas= 0.2118,KC= 0.2244 Ncalc = 1.9 - 1.92 Uniaxial (+), w=1.856-1.859, e=1.876-1.882, bire=0.0200-0.0230. |
| Calculated Properties of Franciscanite-VIIIBulk Density (Electron Density)=3.80 gm/cc |
note: Specific Gravity of Franciscanite-VIII =3.99 gm/cc. Fermion Index = 0.0043065645 |
Boson Index = 0.9956934355 PEFranciscanite-VIII = 14.70 barns/electron |
U=PEFranciscanite-VIII x rElectron Density= 55.84 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Franciscanite-VIII is Not Radioactive | Franciscanite-VIII Classification52.04.01.04 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O |
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(52.04)with cations in [6] and/or > [6] coordination |
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(52.04.01)Welinite group |
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09.AF.07.5 09 - SILICATES (Germanates) |
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09.A - Nesosilicates |
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09.AF -Nesosilicates with additional anions; |
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| Other Franciscanite-VIII InformationNAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
Links to other databases for Franciscanite-VIII : |
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 10 - Ruff.Info Search for Franciscanite-VIII using: Visit our Advertisers for Franciscanite-VIII : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Franciscanite-VIII Mineral Data : Ask about Franciscanite-VIII here : Print or Cut-and-Paste your Franciscanite-VIII Specimen Label here :
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