Is the screen made of aluminosillicate like the iPhone 4?
Want to now if screen is same material as iphone 4
Probably not; it's a big marketing bullet point for the iPhone 4, as is the oleophobic (anti-fingerprint) coating. The LCD in the iPod Touch 4G uses a cheaper (non-IPS) technology, and the glass is probably also cheaper to bring the overall cost down.
Actually iPod Touch 4G seems to use gorilla glass for cover glass with same anti-fingerprint coating although LCD is different from iPhone 4/4S retina. If it's Gorilla glass, it is made of aluminosillicate.
If oleophobic anti-fingerprint coating is worn off already, you can renew by using the world's first anti fingerprint coating kit ' Fusso SmartPhone ' that is applied to many smartphone as default coating. ( www.apeiros.jp/Fussode_COAT_2 or search on Amazon.com ).