Harder than rhodochrosite. The brown prts are tephroite. Manganese and aluminum silicate. Black pats are biotite. Pink crystals are spessartine.
Black pats is manganese stains.
Light brown parts are smaller spessartine crystals set,too. Richiterite is magnesium, natrium, calcium, iron, manganes, etc silicate. Kinoshitalite is barium, magnesium, aluminum silicate. Which is very like a phlogopite. Upper right side green-brown is this one mineral.