Corsi Collection of Decorative Stones

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view of stone 795

Corsi 795, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 795  
Name and quarry location: Swedish porphyry, from Älvdalen, Dalarna, Sweden  
Geological description: Lamprophyre (minette group). Poikilocrysts of brown (?kaersutitic) amphibole up to 25mm enclosing subhedral crystals of pyroxene, feldspar and opaque mineral. Groundmass contains carbonate and possible feldspathoid.  
Comments:  
References: Geonord (n.d.); Porfyr Museet (n.d.); Price (2007) 205  
Further information:
 


Corsi's classification: Class 15. Porphyry; Species 1; ii. Italian porphyries  
Corsi's text: 196.7 Porfido di Svezia  

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