Not all moissanites are created equal: New constraints on moissanite from metamorphic rocks of Bulgaria

- Moissanite occurs in situ in amphibolite facies metasedimentary rocks.
- Moissanite crystals are immersed in amorphous carbon and nanocrystalline graphite.
- Moissanite formed in “black shale clusters” during amphibolite metamorphism.
- SiC exhibits concentric polytypical zonation: 15R-center, 6H-intermediate, 3C-rim.