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Memory is originally based on the Supermemo SM-2 spaced repetition Algorithm.
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Gemmology

Positive detection of pleochroism in gem materials can help distinguish _________ materials from ___________ materials in stones that look otherwise similar to the naked eye.

Isotropic

Author

Positive detection of pleochroism in gem materials can help distinguish _ materials from ___ materials in stones that look otherwise similar to the naked eye.