Volborthite
Mineral Cu3V2O7(OH)2·2H2O
About it
Olive to yellowish-green scaly rosettes and crusts in copper and uranium-vanadium deposits, as on the Colorado Plateau. Named for Russian paleontologist Alexander von Volborth.
- Type
- Mineral
- Group
- Vanadate
- Formula
- Cu3V2O7(OH)2·2H2O
- Hardness (Mohs)
- 3.5
- Specific gravity
- 3.42–3.5
- Streak
- pale yellowish green
- Lustre
- vitreous (glassy), pearly
- Crystal system
- Monoclinic
- Colours
- olive green, yellowish green, greenish brown
- Transparency
- translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.