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| Name | QUARTZ | | Variety | QUARTZ RED | | Origin | Ramasdrift (North Cape Province) South Africa | | Hardness | 7 | | Composition | SiO2 | | Crystaline sys. | TRIGONAL
| | Size | 20,5x15x2,5 cm | | Weight | 415 gr |
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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 QUARTZ RED
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