Cavansite - Ca(V⁴⁺O)Si₄O₁₀·4H₂O

Habit: Brilliant sky blue to greenish blue. Prismatic crystals or spherulitic rosettes. Vitreous luster; transparent. Bluish white streak.

Environment: Found in basalts in association with zeolites and in tuffs.

Etymology: From the elements calcium, vanadium and silicon in its composition.