Venanzite

Venanzite: Melanocratic variety of leucite olivine melilitite largely composed of melilite, leucite, kalsilite and olivine. Rosenbusch (1899) called this rock euktolite unaware that it had already been named venanzite. A kamafugitic rock and now regarded as a kalsilite-phlogopite-olivine-leucite melilitite.

For more information about the San Venanzo volcanic complex, see page: "San Venanzo"

venanzo2020(4a).jpg

Contact between coarse-grained pegmatitic venanzinte (melilitolite) and venanzite aphanitic lava at Pian di Celle lava flow, San Venanzo, Italy.

Contact between coarse-grained pegmatitic venanzinte (melilitolite) and venanzite aphanitic lava at Pian di Celle lava flow, San Venanzo, Italy.

Coarse-grained pegmatitic venanzinte (melilitolite) at Pian di Celle lava flow, San Venanzo, Italy.

Bibliography

• Stoppa, F., & Sforna, S. (1995). Geological map of the San Venanzo volcano (Central Italy): explanatory notes. Acta Vulcanologica, 7(1), 85-91.
• Stoppa, F. (1996). The San Venanzo maar and tuff ring, Umbria, Italy: eruptive behaviour of a carbonatite-melilitite volcano. Bulletin of Volcanology, 57(7), 563-577.
• Stoppa, F., & Cundari, A. (1998). Origin and multiple crystallization of the kamafugite-carbonatite association: The San Venanzo-Pian di Celle occurrence (Umbria, Italy). Mineralogical Magazine, 62(2), 273-289.
• Peccerillo.A (2005): Plio-Quaternary Volcanism in Italy.

Photo
Olivine crystals embedded in a groundmass made by melilite (the small rectangular crystals) and olivine. PPL image, 2x (Field of view = 7mm)	Olivine crystals embedded in a groundmass made by melilite and olivine. XPL image, 2x (Field of view = 7mm)	Olivine crystals embedded in a groundmass made by melilite (the small rectangular crystals) and olivine. PPL image, 2x (Field of view = 7mm)
Olivine crystals embedded in a groundmass made by melilite (the small rectangular crystals) and olivine. PPL image, 2x (Field of view = 7mm)	Olivine crystal embedded in a groundmass made by melilite (the small rectangular crystals) and olivine. PPL image, 10x (Field of view = 2mm)	Olivine crystal embedded in a groundmass made by melilite (the small crystals with blue interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)
Olivine crystals embedded in a groundmass made by melilite and olivine. XPL image, 2x (Field of view = 7mm)	Olivine crystals embedded in a groundmass made by melilite (the small rectangular crystals) and olivine. PPL image, 2x (Field of view = 7mm)	Olivine crystal embedded in a groundmass made by melilite (the small crystals with blue interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)
Groundmass made by melilite (the small rectangular crystals) and olivine. PPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)
Groundmass made by melilite (the small rectangular crystals) and olivine. PPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)
Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small rectangular crystals) and olivine. PPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)
Olivine crystal embedded in a groundmass made by melilite (the small crystals with blue interfence colors) and olivine. XPL image, 2x (Field of view = 7mm)	Olivine crystal embedded in a groundmass made by melilite (the small crystals with blue interfence colors) and olivine. XPL image, 2x (Field of view = 7mm)	Groundmass made by melilite (the small rectangular crystals) and olivine. PPL image, 10x (Field of view = 2mm)
Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)
Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)
Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)	Groundmass made by melilite (the small crystals with blue-gray interfence colors) and olivine. XPL image, 10x (Field of view = 2mm)