Mineral: Quartz
Locality: Monteriggioni Quarries, Monteriggioni, Siena Province, Tuscany, Italy
Dimensions: 22 mm x 46 mm x 30 mm

Description: A bipiramidal crystal on matrix. It reproduces the Siena flag colours, black and white. Mindat says these dark crystals found at this locality are colored by inclusions. They are not smoky quartz.

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