Spessartite Garnet From Madagascar- Collectors Piece, Statement Piece, GemSpessartite Garnet From Madagascar Collectors Piece, Statement Piece, Gem Weight 25g Size 2cm by 2. 5cm Thickness 1. 9cm Spessartine is a nesosilicate, manganese aluminium garnet species, Mn2+3Al2(SiO4)3. This mineral is sometimes mistakenly referred to as spessartite. Spessartine's name is a derivative of Spessart in Bavaria, Germany, the type locality of the mineral. It occurs most often in granite pegmatite and allied rock types and in certain low