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Post by Peruano on May 28, 2018 15:33:59 GMT -5
I acquired 4 large slabs of this material, and based on the numbers written on one of the slabs, someone thought it was desirable. Can anyone id the slab? Likely origin is CA or NV. Thanks for your thoughts.  |
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on May 28, 2018 19:43:21 GMT -5
Actually looks like an "onyx" from Arizona. Not exactly like 7 springs but similar.
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Post by rmf on May 28, 2018 20:15:00 GMT -5
Travertine a.k.a. Mexican Onyx (mohs hardness of 3) where as real onyx is agate made of the mineral quartz with a mohs hardness of 7. your pocket knife should easily scratch it and then you will know for sure.
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on May 28, 2018 23:50:13 GMT -5
Travertine a.k.a. Mexican Onyx (mohs hardness of 3) where as real onyx is agate made of the mineral quartz with a mohs hardness of 7. your pocket knife should easily scratch it and then you will know for sure. Mexico could be also. The mexican onyx does look like seven springs as well |
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Post by Peruano on May 29, 2018 6:58:09 GMT -5
Thanks for the leads. Onyx and travertine just don't jump to my mind and I needed to be reminded.
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