General information about the minerals
in this stone-encyclopedia
All stones included in this encyclopedia can be bought in our shop, if they are not available in the online shop – whether they are in crystalline, tumbled or rubbed (e.g. pendants, necklaces etc.) form.
Degrees of hardness
The hardness of minerals relays on the hardness test from Friedrich Mohs (1773-1839), which is used primarily in the mineralogy. Mohs, a geologist, scratched different minerals at each other and sorted them according to their hardness. By assigning exemplary numerical values to wide-spread and thus easily accessible minerals, an ordinal scale resulted, named the Mohs scale, which is often used in mineralogy and geology.
Mineral hardness (Mohs)
Type of testing: can be scraped with the fingernail
Information on hardness of minerals are always using the Mohs scale, unless nothing else is specified.