input: [1] none if pure, weak dichroism is observed in smoky quartz, amethyst, and certain citrines [Optical Properties] 
output: Pleochroism / Dichroism
options: C o l o r
options: S t r e a k
options: L u s t e r
options: D i a p h a n e i t y
options: R e f r a c t i v e I n d i c e s
options: B i r e f r i n g e n c e
options: P l e o c h r o i s m / D i c h r o i s m
options: C o e f f i c i e n t o f D i s p e r s i o n
options: F l u o r e s c e n c e
options: O p t i c a l A c t i v i t y