@Albatros78
iOS automatically applies a standard glossy styling to all app icons on the homescreen. Is your example an installed app or webapp save to homescreen?
For webapp’s saved to homescreen the iOS auto-styling can be disabled on a case by case bases using the following HTML element in the <head> section of the main html file:
<link rel=”apple-touch-icon-precomposed” href=”/custom_icon.png”/>
The default element generated by MobiOne omits the “-precomsed” is
<link rel=”apple-touch-icon” href=”/custom_icon.png”/>
In the above example, replace custom_icon.png with your icon filename. If you don’t want Safari on iOS to add any effects to the icon, replace apple-touch-icon with apple-touch-icon-precomposed.
Apple Safari Ref
https://developer.apple.com/library/ios/#DOCUMENTATION/AppleApplications/Reference/SafariWebContent/ConfiguringWebApplications/ConfiguringWebApplications.html