Magma is a hot, liquid mixture that changes to solid rock when it cools and hardens. Which of these characteristics are physical properties? The characteristics that are physical are its liquid mixture and solid rock.
The crystals shown above are typical triple phosphate crystals, found in feline and canine urine, and are classically described as rectangular coffin lid shape. They are also called magnesium ammonium phosphate or struvite crystals and are typically found in alkaline urine.
Crystalluria indicates that the urine is supersaturated with the compounds that comprise the crystals, e.g. ammonium, magnesium and phosphate for struvite. Crystals can be seen in the urine of clinically healthy animals or in animals with no evidence of urinary disease (such as obstruction and/or urolithiasis). However, some crystals can be pathologically relevant in certain circumstances (see example of ammonium biurate below). Note that crystals may not form in all urine supersaturated with these compounds.