Romaniket stone is found in "Mexico" / "India" / "America" ​​and has physical and chemical properties, including:

Physical properties
The shape is mass / cluster

The group oxides
Scratching black / glossy brown

Hardness 5 /6

Color is black / iron black / to steel gray

dark

Sparkle Metallic / Matte

Chemical properties

Density 4.7

A rhombic system of crystals exists

The chemical formula is manganese ores