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Rhyolite dome, Roccatederighi, Roccastrada, Grosseto Province, Tuscany, Italy

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Latitude & Longitude (WGS84): 43° 1' 30'' North , 11° 4' 41'' East
Latitude & Longitude (decimal): 43.025, 11.0780555556
Name(s) in local language(s):Rhyolite Dome, Roccatederighi, Roccastrada, Grosseto, Toscana, Italia

from Poli et. al. (2004):
"A cluster of rhyolitic endogenous and exogenous lava domes crops out in the area of Roccatederighi village. Roccatederighi itself is built over such domes. The rock has both a glassy groundmass containing crystals of quartz, K-feldspar (high-T sanidine), plagioclase, and biotite and a microcrystalline groundmass with the presence of K-feldspar (sanidine) megacrysts that in some cases reach sizes up to 5-10 cm across. The peculiarity of Roccatederighi rocks is the presence of magmatic cordierite crystals. Cordierite occurs as euhedral-subhedral to anhedral crystals in some cases showing a dusty aspect because of alteration into pinite crystals which are often oriented along cracks."

Mineral List

5 valid minerals.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


- Marinelli, P., Carletti, P. (1999): Genesis of Roccastrada volcanic rocks (central Italy): inferences from melt inclusions analyses, Periodico di Mineralogia, Vol.: 68, 1, pp. 69-80

- Poli, G., Perugini, D., Rocchi, S, Dini, A. (2004): A crustal section through intrusive and effusive volcanic complexes of the Tuscan magmatic province (Central Italy), 32nd INTERNATIONAL GEOLOGICAL CONGRESS, Florence 2004

External Links

2) Bollettino della Società geologica italiana, Volume 10 By Società geologica italiana, 1891

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