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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Answers by country

aquamarine
bixbite
alexandrite
topaz
answers
flagAustralia
16%
16%
64%
4%
25
flagGreece
15%
0%
52%
31%
19
flagSwitzerland
14%
7%
50%
28%
14
flagItaly
42%
0%
50%
7%
14
flagCanada
7%
23%
46%
23%
13
flagFrance
27%
18%
45%
9%
11
flagthe United States
21%
11%
39%
24%
98
flagPoland
22%
12%
37%
25%
2836
flagGermany
18%
6%
37%
35%
175
flagAustria
14%
8%
37%
40%
35
flagUkraine
34%
15%
31%
18%
32
flagthe Netherlands
30%
15%
30%
23%
13
flagIndia
27%
10%
29%
31%
77
flagthe United Kingdom
30%
16%
23%
23%
59
flagthe Philippines
27%
13%
22%
36%
22
flagPakistan
28%
7%
21%
42%
14