Spessartine or spessartite, is a nesosilicate of the manganese aluminum garnet species. The name is derived from Spessart the name of the locality of the mineral.

It occurs most often in granite pegmatite and allied rock types and also in certain low grade metamorphic phyllites. Australia, Myanmar, India, Afghanistan, Israel, Madagascar, Tanzania and USA are important sources.

Mandarin garnet and is an orange-yellow Spessartine found in Madagascar. The orange garnets result from sodium rich pegmatites. Rhyolites are Violet-red spessartines found in Colorado and Maine.

Spessartine forms a solid solution series with garnet species alamandine. Well formed crystals from this series, varying in color from very dark-red to bright yellow-orange were found in Bulgaria.