Subject: How can I examine Halite and Gypsum structurally?

I am doing a science project growing crystals.  I want to find out the 
similarities between artifically created crystals and those occurring naturally 
in nature.  I will grow artifical crystals, (evaporation method), using table 
salt, iodized salt, kosher salt and sodium-alum and I want to compare those 
crystals to Halite.  I will grow Magnesium Sulfate and want to compare those 
crystals to gypsum.  If I use a part of the solution that I'm growing my 
crystals in and examine them under the microscope, how can I examine the Halite 
and Magnesium Sulfate crystals structurally and chart data?  I really would 
appreciate any advice you can give me.  Sincerely Christina

Re: How can I examine Halite and Gypsum structurally?