【摘要】 在河北阜平地区发现稀有珍贵宝石品种———变色萤石。采用CIE颜色表征系统,对其变色效应进行了定性、定量描述。变色萤石在日光下呈灰蓝色,在白炽灯光下呈红紫色。在标准D65和A光源下的色度坐标分别为(x=0.3250,y=0.3313)和(x=0.4717,y=0.3895)。通过色差计算,定量评价了其变色程度它在不同光源下的色差和色调角差均很大,表明其变色效应明显。结合吸收光谱特征,利用现代色彩心理学的相关理论,解释了变色萤石变色效应的形成机理。在不同的光源条件下,变色萤石各波段色光的透射刺激强度和人眼3种锥体细胞的相对兴奋度不同,因而产生不同的颜色感觉。更多还原

【Abstract】 A rare and precious species of gemstone——colour-change fluorite——has been discovered in Fuping, Hebei Province. The colour-change effect is described qualitatively and quantitatively with CIE colour system. The effect is greyish blue in the sunlight and reddish purple in the incandescent lamp light. Its chroma coordinates are (x=0.3250, y=0.3313) in the standard D_ 65 illuminant and (x=0.4717, y=0.3895) in the standard A illuminant. The colour-change degree is appraised quantitatively by calculating the chromatic aberration(ΔE~). The big ΔE~ and hue angle difference(ΔH~) in the different illuminants suggest that the colour-change effect is very distinct. Besides, the formation mechanism of the colour-change effect is explained with the visible absorption spectrum and the theory of modern colour psychology. The colour-change fluorite has the different transmission intensity in each wave band and the three cone cells of human eyes are stimulated differently in the different illuminant, which result in the different colour senses.更多还原