The Hardness measure of crystals is based upon a relative scale called the "Mohs" scale and varies in value from 1 softest (Talc) to 10 hardest (Diamond).
Quartz which has a Mohs hardness of 7 is twice as hard as Orthoclase with a hardness of 6.
Here are some examples of the Mohs Scale......
Please bear in mind all items are unique natural products, colours sizes and shape will vary.
Any information contained withinthese pages is not an alternative to tradional medicine, and that you should never stop taking any prescribed medication or visiting your doctor on its basis.