Elemental Cassiterite
Elemental Cassiterite (#0D0829) is a deep blue 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 (249°, 67%, 10%) places it in the balanced band at a dark lightness. It works well as a headline, icon, or deep background in an otherwise light layout, pairing cleanly with cream, bone, and warm neutrals. For a confident two-color system, pair it with its complementary yellow. For something softer, pull in its analogous neighbors on either side of the wheel.
Etymology
Latin elementum, element — adjectival suffix -al. As a color modifier, elemental implies a neutral-and-foundational-and-natural-element quality where the hue carries the visual register of earth-and-stone-and-water-and-air foundational-and-elemental natural-mineral-and-pigment surface. Sits at the neutral-and-foundational end of the grid, parallel to foundational and primal 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.
Wide gamut
The CSS Color 4 wide-gamut form of this color. Both swatches render the same color on every display — the P3 form only diverges from sRGB when a designer pushes channels outside sRGB's reach.
This color sits well within the sRGB cube. P3 and sRGB share the gray axis and most desaturated tones, so a P3 display renders this identically to an sRGB display.