The phrase
"microscopic crystals" refers to very tiny pieces of a solid substance that have a crystalline structure. These crystals are so small that they cannot be seen by the naked eye and require a microscope to be seen clearly.
Full definition
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Overview Stones of the urinary tract begin as
microscopic crystals that aggregate to form stones of variable size and shape anywhere within the urinary system, including the kidneys, ureters, and urethra, although stones of the urinary bladder are most common.
Immediate treatment will start with a meticulous rinsing of the mouth and affected areas with cool, clean water to remove as many of
the microscopic crystals as possible.
When the pH in the urine becomes either too high or too low (a pH of approximately 6.5 is a normal),
these microscopic crystals can develop in the bladder.
Simplistically, some cats have urinary stones (urolithiasis) or
microscopic crystals, while other cats have a condition called feline idiopathic cystitis (FIC).
Some cats form urinary stones or
microscopic crystals, which can become stones, in their urinary tract.