A calcitic crystalloblastic metamorphic lithotype composed of subeuhedral crystals with grain boundaries that are predominantly sutured and lobated while the secondary ones are straight. The microstructure is slightly anisotropic due to the preferred orientation of the elongated components. The blasts are seriate (from 100 to 800 µm), even though are in the region of 300 µm. The rare microgranulation is composed of opaque minerals. Idiomorphous pyrite occurs ranging between 30 and 500 µm in size, sometimes in crystals close to one another, where the microstructure has blasts with grain boundaries that are more interlobated and also smaller (70 ÷ 90 µm). There is also rare acicular muscovite.