Corsi Collection of Decorative Stones

view of stone 538

Corsi 538, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 538  
Name and quarry location: Alabastro di Siena, from Siena, Tuscany, Italy  
Geological description: Banded yellow calcite, probably a compact banded travertine.  
Comments: Despite the very large number of 'alabastri' in his collection, Corsi did not recognise that this was yet another. The two minerals calcite and fluorite could be distinguished by comparing hardness on the unpolished back of the specimen; calcite, at 3 on Mohs scale of hardness is softer, and would be scratched by fluorite, which is 4 on the scale.  
Further information: Alabaster-travertine.pdf

Corsi's classification: Class 2. Fluorspars  
Corsi's text: 133.1 Spato fluore. Spato di Siena  

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