Hi Paul,
I was doing some resource gathering in the background to respond to a previous conversation we were in. The topic had a tangent discussion identifying the crystal habit while in-situ of the host matrix. You had asked some really good questions on the subject and I felt obligated to provide some resources to help with knowledge/examples of these identification processes.
Apologize for not being quicker with this information. I hadn’t forgotten to follow-up, but time has been rather twisted with some very successful and some not so successful work tasks the past few weeks. It has been busy, nonetheless.
Identifying a crystal habit is not keenly straight-forward for those who are not in the appropriate disciplines, focused on such puzzles (Ahem…speaking strictly about myself here… as I still struggle with the nomenclature). Not sure how familiar you are with crystallography in general, so I am posting several levels of resources for the subject. I have these book-marked on “speed-dial” 
My “go-to” resources:
Open Mineralogy Chapters 10, 11, and 13 focus on Crystal Habit and structures.
Mineral Identification Key II Site This is the host site for the link below.
Generalized Habit descriptors A good rule of thumb process to practice in field collecting.
Cheers!