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Crystals found in Urine Crystals are divided into two categories depending on whether they are found in  acid (<7) pH or alkaline (>7) pH. Types of Crystals: Normal Crystals in Acidic Urine Uric Acid:  It is seen in acidic urine and pH must be <5.8 to form uric acid crystals  Typically coloured either yellow or reddish-brown, but may be colourless.   Often seen as a four-sided plate that may be thin or thick and laminate. Crystals may cluster into rosettes.  Other forms are rhombic plates or prisms, barrel-shaped, thick cubes, oval forms with pointed lemon-shaped ends, and wedges. Occasionally, colourless six-sided forms resembling cystine are seen.  Strongly birefringent when viewed with polarized microscopy  Calcium Oxalate:  Seen in an acid environment, but may also be found in neutral or alkaline urine  Small and colourless. Large forms are uncommon.  Dihydrate crystals are the most commonly seen. Appear as an envelope or square with a cross.  Monohydrate crystals
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