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Franciscanite-VIII

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Formula:
Mn
2+
6
(V
5+
 
,◻)
 
2
Si
 
2
(O,OH)
 
7
System:TrigonalLustre:Vitreous
Hardness:4
Name:Named after the Miocene age Franciscan Formation.
This page provides mineralogical data about Franciscanite-VIII.

Classification of Franciscanite-VIII

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Physical Properties of Franciscanite-VIII

Lustre:Vitreous
Hardness (Mohs):4

Crystallography of Franciscanite-VIII

Crystal System:Trigonal

Optical Data of Franciscanite-VIII

Type:Uniaxial (+)
RI values: nω = 1.856 - 1.859 nε = 1.876 - 1.882
Maximum Birefringence:δ = 0.020

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High

Chemical Properties of Franciscanite-VIII

Formula:
Mn
2+
6
(V
5+
 
,◻)
 
2
Si
 
2
(O,OH)
 
7
Essential elements:Mn, O, Si, V
All elements listed in formula:H, Mn, O, Si, V

Other Information

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

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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 20th Jun 2011 13:48:30
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    Locality Updated: Waldeck Farm 28, Windhoek District, Khomas Region, NamibiaFrom Debbie Woolf, 12th Feb 2012 18:17:26