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| Name | QUARTZ | | Variety | RED QUARTZ | | Origin | Tinejdad (Meknes) Marocco | | Hardness | 7 | | Composition | SiO2 | | Crystaline sys. | TRIGONAL
| | Size | 11,8x9,3x5,7 cm | | Weight | |
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Description:
Quartz was chosen by the geologist Friedrich Mohs to represent grade 7 in his famous scale of hardness dating back to 1825, and which is still valid nowadays. |
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QUARTZ 
VARIETY RED QUARTZ
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