(and its variant ) is an elegant, high-contrast serif font designed by Matt Yow. It draws deep inspiration from 17th-century Spanish Baroque art, specifically the tenebrism (dramatic lighting) found in the paintings of Diego Velázquez. The font's name and character are rooted in geology:

Typography Analysis Department

Note: Unlike massive families such as Helvetica Neue (which has dozens of weights), Arkosic is intentionally restrained. It is not designed for long-form body text but as a statement display face.