A Mystery and an Enigma
I found a few tidbits:
This technical report on text processing discusses a very early version of Crystal Writer. Apparently it was developed in UCSD Pascal for a Western Digital system.
https://archive.org/details/DTIC_ADA142570/page/195/mode/2up?q=crystalwriter&view=theater
There was a fancier version called the Crystal Document Management System. This article has a screenshot of that:
https://books.google.be/books?id=szsEAAAAMBAJ&pg=PT23&lpg=PT23&dq=%22Crystal+Document+Management+System%22&source=bl&ots=ASwo2UDL6H&sig=ACfU3U3BqJq7ewp3oE4Hl50xBxrGrahpDQ&hl=en&sa=X&ved=2ahUKEwiumdrciLH6AhUOGewKHanoBYwQ6AF6BAglEAM#v=onepage&q=%22Crystal%20Document%20Management%20System%22&f=false
Finally, it looks like testing Crystal Writer was mandatory for Unix 93 certification:
http://www.opengroup.org/csq/csqdata/blanks/INTUX.html
I found a few tidbits:
This technical report on text processing discusses a very early version of Crystal Writer. Apparently it was developed in UCSD Pascal for a Western Digital system.
https://archive.org/details/DTIC_ADA142570/page/195/mode/2up?q=crystalwriter&view=theater
There was a fancier version called the Crystal Document Management System. This article has a screenshot of that:
https://books.google.be/books?id=szsEAAAAMBAJ&pg=PT23&lpg=PT23&dq=%22Crystal+Document+Management+System%22&source=bl&ots=ASwo2UDL6H&sig=ACfU3U3BqJq7ewp3oE4Hl50xBxrGrahpDQ&hl=en&sa=X&ved=2ahUKEwiumdrciLH6AhUOGewKHanoBYwQ6AF6BAglEAM#v=onepage&q=%22Crystal%20Document%20Management%20System%22&f=false
Finally, it looks like testing Crystal Writer was mandatory for Unix 93 certification:
http://www.opengroup.org/csq/csqdata/blanks/INTUX.html