MnO2 |
 |
Dark-gray, metallic PYROLUSITE (likely combined with other manganese oxides) found interstitial to QUARTZ (Var: Jasper) - orbicular jasper, cut and polished Rialto Beach |
MnO2 |
|
|
Dark-gray, metallic PYROLUSITE (likely combined with other manganese oxides) found interstitial to QUARTZ (Var: Jasper) - orbicular jasper, cut and polished Rialto Beach |