Linked from
The 9 pages that link to Talc, each with the reason it gives.
Mohs scaleBroader topic: It anchors the scale at its softest reference point.
Friedrich MohsBroader topic: Its position at the scale's bottom anchors Mohs's ranking.
Face powderRelated: Its smooth slip and oil absorption made it a traditional base for face powders.
Eye shadowRelated: Talc has been used to give powder shadows slip and softness.