Corsi Collection of Decorative Stones

view of stone 726

Corsi 726, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 726  
Name and quarry location: Rhodonite, from Maloe Sedelnikovo, Ekaterinburg, Sverdlovsk Oblast, Russia  
Geological description: Massive pink rhodonite, with brown bustamite and other manganese silicates. Black manganese oxides emanate from fractures.  
Comments: Rhodonite forms by contact metamorphism of manganese deposits. Corsi's specimen would have come from a fine large deposit discovered in the mid 18th century at Maloe Sedelnikovo near Ekaterinburg. Originally thought to be a fine-grained compact form of rose quartz, the mineral was analysed and published as distinct mineral species called rhodonite in 1819. That was perhaps after Corsi had obtained this sample, and might explain why he was unaware of its true identity. The base of Corsi's specimen has been augmented with strips of the stone to make it the required size.  
References: Bauer (1904) 456-457; Dana (1892) 380; Dietrich (2009); Price (2007) 269; Webster (1994) 365  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 5. Agate  
Corsi's text: 138.4 Quarzo roseo compatto di Siberia  

Full entry in English

Enter some search terms
Show results as:

search tips

Searches the database for all stone records containing the words you enter. To search for a text string, put it between quotation marks. To search for stone records that don't contain a word, put a minus sign in front of it.

For example, entering: granite "coarse-grained" -Egypt will find all the coarse-grained granites that do not come from Egypt.

Terms of three characters or less have not been indexed.