Hydromagnesite (Inventory)/Rim
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The Rim field of the Hydromagnesite section should be used to record stations that exhibit rims of hydromagnesite. Other mineral rims have their own field in their respective sections.
Hydromagnesite rims (also sometimes known as vents) are wind formed features of hydromagnesite. They form usually around constrictions where consistent airflow is present. Rims form as a shell or projection extending on the upwind side of a constriction where moisture laden air consistently escapes. As such, they tend to require a pool or water source somewhere on the downwind side in order to provide the moist, warm air.
Rims can be any of a number of shapes from round tubes or eggs to more irregular shells or ears. They tend to conform somewhat to the shape of the constriction but may be biased in only one direction by the airflow. They can be found on the floor, walls or ceiling; anywhere air is or was escaping.
Rims can form from various mineral materials and several of them have fields on the inventory form. The appropriate field based on the mineral content of the rim feature should be used. Only hydromagnesite rims are recorded in this field.
See also
