If there is a white painted circle on the road 4-5 ft diameter at a 4 way junction. No signs on poles. Does the same rules apply. Give way to a car turning right. If the car is already on the junction.
If you download the document in this link, it gives the description of a mini-roundabout. Unless the painted circle has three arrows around it showing the direction of travel, it's not a mini-roundabout.