if you have a good art supply nearby like a blick or pearl , most carry carving blocks pretty cheap... however I don't recomend using it for a pen I have tried alabaster and soapstone they turn easy but will shatter if you look at them wrong and scratch way too easy
I have a cigar that survived turning and assembly that is very bruised from the minimal handling it has recieved in its sheltered life , I will not sell it due to how fragil it is
ringholders and small vases work great
if you don't have a dust collection system however save your money you wouldn't believe the mess it makes