Ifound a type of rock in the woods it's kinda rough black with some purple like a lavender purple and i can break it into pieces what could it be?

1.solid

2.carbon dioxide

3.helium

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.