Corsi Collection of Decorative Stones

view of stone 713

Corsi 713, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 713  
Name and quarry location: Quartz, only slightly amethystine, locality unknown  
Geological description: Very coarsely granular quartz, showing iridescence due to internal flaws, and containing inclusions of small aggregates of specular hematite crystals. It is barely amethystine in colour.  
Comments: This sample is virtually colourless and barely merits the name 'amethyst'.  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 2. Amethyst  
Corsi's text: 178.2 Amatista... Trovasi in molti luoghi.  

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