There used to be a company called EarthShell which made biodegradable food packaging and other containers out of limestone and other stuff. It went public in 1998[0], filed for bankruptcy protection a decade ago[1], and their twitter account was last updated in 2010[2].

I wish TBM better luck.

[0] https://secure.marketwatch.com/story/earthshell-begins-to-cr...

[1] "After losing more than $331 million during its 14 years of operations, EarthShell Corp. has filed for Chapter 11 bankruptcy protection." - http://www.bizjournals.com/baltimore/stories/2007/01/29/stor... (paywalled)

[2] https://twitter.com/EarthShell

Interesting trivia: the founder and chairman, Essam Khashoggi, is the brother of Adnan Khashoggi - a central figure in the Iran-Contra affair.