Which of the minerals below show pleochroism?

aquamarine
bixbite
alexandrite
topaz
Pleochroism is an optical phenomenon in which a substance has different colors when observed at different angles, especially with polarized light. Alexandrite appears greenish in daylight where the full spectrum of visible light is present, and reddish in incandescent light which emits less green and blue spectrum.
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aquamarine
bixbite
alexandrite
topaz
answers
flagAustralia
13%
18%
63%
4%
22
flagSwitzerland
9%
0%
63%
27%
11
flagItaly
46%
0%
53%
0%
13
flagGreece
15%
0%
52%
31%
19
flagCanada
8%
25%
41%
25%
12
flagGermany
15%
6%
39%
36%
132
flagPoland
23%
13%
37%
25%
2373
flagthe United States
23%
14%
33%
25%
78
flagUkraine
34%
15%
31%
18%
32
flagIndia
29%
9%
30%
28%
71
flagAustria
22%
13%
27%
36%
22
flagthe United Kingdom
23%
19%
26%
26%
46
flagPakistan
28%
7%
21%
42%
14
flagthe Philippines
31%
18%
18%
31%
16