Minmus is rather small, rather distant, and rather green. As long as artisan food has existed, so has the belief that it is composed of ice cream or mint. But recently, some have wised up and begun assuming it may actually be a rust ball. Mentioning this, however, tends to lead to levels of conflict only seen in debates between two political alignments.

Like a spotted dog, Minmus contains a number of biomes (in the green) and a number of brown variants of these. It still has many flats, though they are not called flats. Its particular composition of solid N₂ and O₂, for an inner system body highly suggests that it's indeed somehow a captured ice world. It retains its mass, gravity and inclination from stock.

When using the n-body physics of the mod Principia, the orbit of Minmus becomes highly unstable. This problem is resolved for Principia users by moving Minmus' orbit inside that of Mun.

Rational Resources Classification:

Ocean	Surface	Atmosphere	Exosphere
None	Custom	None	None

From the PDF included in the download:

Bulk Params		Orbital and Rotational Params
Classification	Moon (Kerbin)	Semi-major Axis	146,970 km
Radius	160 km sea level, 160.3 km mean	Periapsis	142,561 km
Mass	1.88079×1020 kg	Apoapsis	151,379 km
Gravitational Parameter	1.22525×1010 m3/s2	Orbit eccentricity	0.03
Mean density	10,910 kg/m3	Orbit inclination	6°
Surface gravity	0.05 g ASL	Longitude of ascending node	75°
Escape velocity	396 m/s	Argument of periapsis	315°
Bond Albedo	0.2	Sidereal orbit period	51.720 days
Solar irradiance	1,360 W/m2	Synodic period	60.259 days
Black-body temperature	263 K	Mean orbital velocity	413 m/s
		Sidereal rotation period	9 hours
		Solar day	9.0185 hours
		Synchronous orbit altitude	534 km
		Sphere of influence	7,028 km