Stoical Cassiterite
Stoical Cassiterite (#1C0015) is a deep magenta with a jewel character. It carries the deep, saturated richness of a gemstone. Authoritative and slightly formal, it works well for type and heavy UI elements. Its HSL profile (315°, 100%, 5%) places it in the highly saturated band at a dark lightness. Best used in small doses, like logos, CTAs, focus rings, or highlight text, where its saturation becomes a feature rather than noise. For a confident two-color system, pair it with its complementary green. For something softer, pull in its analogous neighbors on either side of the wheel.
Etymology
Greek stōikós, of-the-Stoa — adjectival suffix -al. As a color modifier, stoical implies a neutral-and-restrained-and-unaffected quality, the neutral color of Stoic-philosophical and Spartan-school unaffected-and-stripped-down formal-but-unaffected color-decision. Sits at the neutral-and-restrained end of the grid, parallel to stoic and reserved in usage.
SnO₂ tin-dioxide mineral — the principal ore of tin metal, mined since the Bronze Age at Cornwall in England and Banka in Indonesia. Cassiterite color refers to a freshly cleaved Cornish stannite tetragonal-prism crystal face: a saturated, slightly cool deep black with the adamantine finish of tetragonal-system tin-dioxide. The Greek genus name kassíteros (tin) gives Latin and English cassiterite.
Closest matches
The nearest named color in three reference sources, ranked by perceptual distance (ΔE76 in CIELAB). ΔE < 1 is imperceptible to most viewers; ΔE > 10 is clearly different. When two sources point to the same hex they’re merged into one tile; click any to open that color’s page.
Variations
Click any swatch to exploreHarmonies
Accessibility
How this color appears to viewers with the four major color-vision-deficiency types. Computed via the Machado (2009) physiologically-based model. If a tile matches the original, the color reads the same to that viewer.
The color used as foreground text against pure white and pure black, with the contrast ratio and WCAG 2.1 grade. Aim for AA (4.5:1) for body text and AA Large (3:1) for 18 pt+ headlines; AAA (7:1) is the gold standard for long-form reading surfaces.