水钙铝榴石 (Hydrogro-ssular)的折射率是()
A: 1.659~1.680 (+0.004,-0.006)
B: 1.46~1.570 点测1.50
C: 1.666~1.680 (±0.008) 点测常为 1.65~1.67
D: 1.720 (+0.010,-0.050)
A: 1.659~1.680 (+0.004,-0.006)
B: 1.46~1.570 点测1.50
C: 1.666~1.680 (±0.008) 点测常为 1.65~1.67
D: 1.720 (+0.010,-0.050)