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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.

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- 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

1) http://www.socgeol.info/altro/documents/guide_books/P70.pdf
2) Bollettino della Società geologica italiana, Volume 10 By Società geologica italiana, 1891

Mineral and/or Locality  
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