Jasper stone , purple stone

 

(terrestrial) is alien  hard as Rock
The object in the image appears to be a piece of jasper, a type of opaque, fine-grained chalcedony quartz. 

Composition:

Jasper is an opaque rock whose color variations are due to the mineral content of its original sediments or volcanic ash. 

Formation:

It typically forms when fine particulate materials are cemented by silica, often occurring in soft sediments where silica precipitates and solidifies them. 

Appearance:

The patterns seen in jasper, such as those resembling flow or depositional patterns, arise during this consolidation process. 

Varieties:

There are many varieties of jasper, including leopard skin jasper with circular patterns, red picture jasper, and ocean jasper. 

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