The mosaic slime gets its name from the glittering array of glass tiles that cover its body. This glass produces a similar anomaly found in the desert itself, making the mosaic slime beautiful, but quite dangerous.
Mosaic slimes can be very dangerous for an unprepared rancher. Their glass tiles create a shimmering effect in daylight that attracts other slimes to them. It is unknown why slimes exhibit this behaviour exactly, but leading theories indicate that 'sparkly things are super cool.' Even more dangerous, the mosaic slime can produce glints in the space around them: ultra-hot solar anomalies that grow in intensity before drifting toward the ground and bursting into flames. Glints can be snuffed with a splash of water, but the best way to reduce their appearance is to ensure your mosaic slimes are well-fed and not agitated.
Mosaic plorts are desired for researching the glass structures within the Glass Desert. Samples of this glass turn brittle when taken from the Far, Far Range, yet interestingly, mosaic plorts seem unaffected by this phenomenon. Almost certainly, this glass is being studied because it's really pretty and not because it can cause devastating solar anomalies.