Simplify the following text for a Grade 9 native English-speaking person.
Original: The so-called `` water '' absorption feature around 3 Î 1\/4 m , which can be an indication of water content in minerals is also present .
Simplified: The so-called `` water '' absorption feature around 3 Î 1\/4 m , which can be a sign of water content in minerals is also present .