Jasper is a variety of microcrystalline quartz made completely opaque by the inclusion of other minerals. The red color is given by the presence of iron oxides inside, the shades of green are linked to the presence of amphiboles and pyroxenes, while the yellow or black color is linked to the presence of hydroxides or manganese oxides.
Dimensions
Height (cm): 9.7
Depth (cm): 2.4
Width (cm): 2.6
Weight (g): 75
Property
Chemical Formula: SiO2
Mohs scale: 7
Relative density: 2.65
Crystalline System: Trigonal