https://mongodb.github.io/mongo-csharp-driver/2.12/apidocs/html/M_MongoDB_Driver_GeoJsonObjectModel_GeoJsonGeometryCollection_1__ctor_1.htm
GeoJsonGeometryCollection(TCoordinates) Constructor (IEnumerable(GeoJsonGeometry(TCoordinates)))
Initializes a new instance of the class.
constructorienumerable