Red Embers Garnet w/ Tourmaline in Schist, Red Almandine Crystals, Mineral Specimen from Massachusetts, USATranslucent almandine garnets occur within a graphite rich schist matrix alongside slender black tourmaline crystals in this metamorphic assemblage from Massachusetts. The garnets are ironaluminium silicates formed during regional metamorphism of pelitic sediments, growing as porphyroblasts within a strongly foliated schistose fabric that also concentrates carbon as graphite. A characteristic feature of this material is its optical response under
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Red Embers Garnet w/ Tourmaline in Schist, Red Almandine Crystals, Mineral Specimen from Massachusetts, USA