Compound	Color	Cu site symmetry	Δ_B	Δ_E	Δ_A	Other Transition	Reference
CaCuO₂ (infinite layer)	dark-grey	D_4h	13,230	15,730	21,370	-	[33]
Tenorite CuO	brownish	C_i	12,170	12,930 15,530	16,670	many	[53] **
Conichalcite synth. CaCuAsO₄OH	light green	C₁	10,575	12,500	8585	15,313 ZRS? 31,370 (E_g)	[54]
Lammerite synth. Cu₃(AsO₄)₂	dark green	C₁ C_i	11,530	12,400 14,050	10,200 14,050	23,260 CuO 31,250 (E_g)	[22] ; this work*
Y₂BaCuO₅	vivid green	D_4h	12,500		14,700	25,970 CT	[55] **
Y₂BaCuO₅	vivid green	D_4h	10,700	13,200	14,700	25,970 CT	[55] **
Azurite Cu₃(CO₃)₂(OH)₂	blue	C_i C₁	11,806 11,806	16,484 11,806	16,484 11,806	19,793 17,952	[56] ** T = 80 K
Chalcanthite CuSO₄・5H₂O	deep blue	C₁ C₁	11,407 11,860	13,308 13,488	9699 9735	15,234 ZRS? 15,567	[57]
Litidionite synth. KNaCuSi₄O₁₀	light blue	C_i	11,723	14,700	13,900	21,400 SPE 31,600 (E_g)	[22] [23] ; this work
Cu₆Ge₆O₁₈	dirty blue	C₁	12,100	14,723	17,700	22,880 SPE	[17] ; this work
Cu₆Ge₆O₁₈・6H₂O	bluish-green	C₁	11,880	14,320	11,880	16,230 ZRS? 21,650 CT 30,300 (E_g)	[17] ; this work
Cu₆Ge_5.4Si_0.6O₁₈・6H₂O	dark green	C₁	13,300		19,400	23,900 CT	[17]
CuGeO₃	turquoise	D_2h	12,570	13,970	12,920	15,733 ZRS? 15,800	[24] ; this work
BaCuSi₄O₁₀ synth. (Effenbergite)	deep blue	D_4h	12,200	15,950	18,520	-	[58]
SrCuSi₄O₁₀ synth. (Wesselite)			12,480	16,050	18,520	-	[58]
CaCuSi₄O₁₀ synth. (Cuprorivaite)			12,590 12,740	15760 16130	18,530 18,520	-	[44] [59]
Dioptase dehydrated Dioptase partly dehydrated	black dark blue	C₁	12,330 12,500	14,960 14,500	17,930 17,600	22,680 SPE -	This work; [19]
Dioptase Cu₆Si₆O₁₈・6H₂O	emerald green	C₁	11,500 12,495	14,500 15,010	17,000 10,200		[18] [19]
Dioptase Cu₆Si₆O₁₈・6H₂O	emerald green	C₁	11,507	14,400	10,700	16,670 ZRS? 24,160 CT 30,660 (E_g)	This work