Moissanite Dispersion (Silicon Carbide)

Physically-modeled moissanite (silicon carbide) dispersion, built from the real ordinary-ray Sellmeier equation for 6H-SiC (Wang et al., Laser Photonics Rev. 7, 831-838, 2013): n^2 = 6.57232 + 0.1401/(lam^2-0.03178) - 0.02153*lam^2 (lam in um), not tuned by eye. At the sodium D line (589.3nm) this formula gives n=2.6474, a 0.25% difference from the commonly-cited 6H-SiC reference index (n=2.654, e.g. Wikipedia's Moissanite article). That gap is wider than this creator's diamond asset's 0.02% match to its own textbook reference, and it's disclosed rather than hidden: unlike diamond's single, extremely well-characterized crystal, published SiC indices genuinely vary by a few tenths of a percent across sources. Per-channel refractive indices used here: R 2.63581 @630nm, G 2.66905 @532nm, B 2.70689 @465nm. Computed F/C-line dispersion (n486nm-n656nm) is 0.0635, about 2.5x this creator's diamond asset's own 0.0250 - the real, checkable reason moissanite shows more rainbow 'fire' than diamond, not a marketing claim taken on faith. Real 6H-SiC is birefringent (no=2.654 vs ne=2.967, enough to double an image through a real stone); this material uses only the ordinary-ray index and does not simulate that double refraction. Channel tint colors are the CIE 1931 color-matching function's actual response at each sampled wavelength. Uses the standard three-IOR additive-Glass-BSDF technique for Cycles/Eevee. Apply to any faceted gem-cut mesh - this asset ships the material only, not geometry. Same CIE 1931 code already shipped and tested in this creator's Caustify spectral path tracer and the N-BK7/N-SF11/diamond materials.

A separate paid pack (all five materials — N-BK7, N-SF11, diamond, moissanite, sapphire — plus a ready-to-render Cycles demo scene and labeled dispersion close-ups for each) is on Gumroad: https://laterrr.gumroad.com/l/mnziiy. This BlenderKit version stays free and unchanged.