The average typing speed is 38-40 words per minute (wpm) for adults  in a professional working environment (despite many incorrect  reports on the web that it is 50-60 wpm).
Chronic Health Effects The following chronic (long-term) health effects can occur at some time after exposure to Mica and can last for months or years: Cancer Hazard * Some Silicas have been shown to cause cancer in animals. The risk of cancer in humans from Mica is unclear at this time.
Mica imparts a sparkly white appearance to cosmetics and personal care products. Scientific Facts: Mica is a group of silicate minerals that are widely distributed in different types of rock. Mica often occurs as flakes, scraps, or sheets, and has been used by humans since prehistoric times.