Spessartineとは 意味・読み方・使い方

Spessartine previously named spessartite, is a nesosilicate, manganese aluminium garnet species, Mn(II)₃Al₂(SiO₄)₃. The 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 grade metamorphic phyllites. The sources for gem quality spessartine are Sri Lanka and Brazil. Other sources include Australia, Myanmar, India, Afghanistan, Israel, Madagascar, Tanzania (since late 2007) and the US. Spessartine of an orange-yellow has been called Mandarin garnet and is found in Madagascar. Violet-red spessartines are found in rhyolites in Colorado and Maine. Spessartine forms a solid solution series with the garnet species almandine.