During the medieval era, a uniquely (*) blue type of this medium was created in Chartres, and Art Nouveau examples were prominently made by Louis Comfort Tiffany.
One work in this medium in Indianapolis shows the Archangel Michael holding a horn and raising his right hand. Angel of the Resurrection is a work in this form used in several war memorials by Christopher Whall. During the medieval era, a uniquely (*) blue type of this medium was created in Chartres, and Art Nouveau examples were prominently made by Louis Comfort Tiffany. Color can be added to these works by infusing gold or manganese salts into the "soda-lime" variety of its main constituent, which is usually clear. For 10 points, name this type of artwork often seen in the windows of churches and cathedrals.
One work in this medium in Indianapolis shows the Archangel Michael holding a horn and raising his right hand.
stained glass windows (prompt on “glass”; prompt on “windows”)