I add a module to my site on the slides of rocks (link - V1... V2 will be online in few weeks).
There will be a possibility of making turn the stage to characterize minerals.
For example -> micas (for three minerals)
Some images extracted from this work.
Lots of colors.
01 -

(zircon)
02 -

(partially chloritized biotite)
03 -

(olivine)
04 -

("natural" light - olivine in limburgite)
Enjoy.