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Franciscanite-VIII

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Formula:
Mn2+6(V5+,◻)2Si2(O,OH)7
Lustre:
Vitreous
Hardness:
4
Crystal System:
Trigonal
Name:
Named after the Miocene age Franciscan Formation.
This page provides mineralogical data about Franciscanite-VIII.


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Physical Properties of Franciscanite-VIIIHide

Vitreous
Hardness:

Optical Data of Franciscanite-VIIIHide

Type:
Uniaxial (+)
RI values:
nω = 1.856 - 1.859 nε = 1.876 - 1.882
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of Franciscanite-VIIIHide

Formula:
Mn2+6(V5+,◻)2Si2(O,OH)7

Crystallography of Franciscanite-VIIIHide

Crystal System:
Trigonal

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Franciscanite-VIIIHide

Mineral and/or Locality  
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