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18-10-2018 | Image

Figure 2

Figure 2: Close-up view X400, polarized light with first order red compensator, showing small strongly birefringent crystals with positive elongation typical of monosodium urate crystals, and also negatively birefringent or mildly birefringent crystals with negative elongation typical of calcium pyrophosphate crystals. Observe that there are some crystals parallel to each other that shine bright blue – urate- and dull yellow –pyrophosphate.

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