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0 item @ $0.00  

Pentagonite

#47543

Pentagonite

#47543
Availability
Sold
Size
4 x 3.5 x 3.5 cm - Miniature 
Formula
CaV4+OSi4O10·4H2O (RRUFF)
Locality
Wagholi, near Pune, Maharashtra, India
Tagged
vanadium

Prismatic Pentagonite crystals with sharp terminations. There are many excellent crystals. There may be Cavansite near the center of the cluster. The two minerals share the exact same composition but are dimorphous, although they both crystallize in the orthorhombic system. The symmetry is different between the two. Pentagonite is bladed, while Cavansite is more prismatic. Visually, Cavansite crystals show a more prismatic nature with complex terminations and chisel-like as opposed to bladed like Pentagonite. Get it? Anyhow the whoole cluster is 1.4cm. 

Pentagonite

Formula
CaV4+OSi4O10·4H2
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Twinning Common, Rosette 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
greenish blue 
Streak
bluish white 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness
3-4 

Data courtesy of Webmineral.

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