Snooped around a bit on the web and found this site.
They list ingredients, so maybe theres some info that could be useful.
http://www.cosmetics.com/mineral.htm
This is a recepie for a cover stick listed in the folder I´ve got from my vendor.
This is for lightcoloured skin.
Base 50 ml
Safflower oil 39 ml
Beezwax 7 g
Carnubawax 4 g
(vit E 0,3 g) if wanted
Pigments
Iron oxide, red (pigment red no 27) 0,5 g
Iron oxide, yellow (yellow no 19) 3 g
Chromium green (pigment green 17) 0,5 g
Iron oxide black (Black no 16) 0,5 g
Titanium dioxide (pigment white no 6) 8g
Another one for mediumlight scin
Iron oxide, red (pigment red no 27) 0,75 g
Iron oxide, yellow (yellow no 19) 4 g
Iron oxide black (Black no 16) 0,25 g
Titanium dioxide (pigment white no 6) 8g
Procedure :
Blend pigments in a small jar, put in mortar, pestle well.
Melt base ingredients.
Blend 1-2 ml pigmentblend to 10 ml of base.
This makes 2 regular chapstick sizes.
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Maria in Sweden