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Mineralpedia Details for Ruifrancoite

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Ruifrancoite

Ruifrancoite

Named for Professor Rui Franco for his many contributions to Brazilian mineralogy and geology. It occurs only in Minas Gerais in Brazil at the Sapucaia mine and the Poco d’Antas claim. It occurs filling vugs in albite and muscovite and is closely associated with cyrilovite and meurigite in a granite pegmatite at the type locality. It appears as red-brown lath in fan-shaped botryodial arrangements.

Ref. Atencio, D., et al. and The Canadian Mineralogist October 2007 vol. 45 no. 5 1263-1273

Formula
Ca2[ ]2Fe3+4Be4(PO4)6(OH)6ยท4H2
Crystal System
Monoclinic 
Crystal Habit
Acicular, Lath, Botryoidal 
Cleavage
Perfect, Good, None 
Color
reddish brown 
Streak
orange brown 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4.5 
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Ruifrancoite from Galiléia, Doce valley, Minas Gerais, Brazil

Ruifrancoite
            from Galiléia, Doce valley, Minas Gerais, Brazil

Yellowish tan micro rosettes to maybe 0.75mm of Ruifrancancoite, a rare member of the Roscherite group associated with white fibrous looking Meurigite on Quartz matrix

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