Round Onyx marble bowl

Onyx marble bowl from Morocco Size- 11cm x 10.6cm x 2cm Weight- 200g You will receive the item in the photo Onyx marble (specifically known as banded calcite or Mexican onyx),is chemically distinct from true onyx (a silicate) and true marble(a metamorphic rock). Crystal system- Trigonal Habit- Typically aggregates into fibrous,banded or massive structures. Mineral class- Carbonate Rock formation- Sedimentary rock Process- Chemical precipitation from cold-water dissolved carbonate solutions. Environment- forms in caves as stalagmites/stalactites or near cold springs (travertine) Banding- created by alternating mineral impurities and varying water flow rates. Hardness- 3 on the MOHs scale