A rock collector is generally referred to as a rockhound.A person who studies the science behind rocks is called a petrologist.
Rock collecting is generally called rockhounding, or mineral collecting. There aren't actually that many true rock collectors; the main interest is minerals, which are much more attractive, colorful, and interesting than rocks.
Someone who collects rocks or stones is simply called a rock hound or rock collector. A person that has an extensive knowledge of precious stones is a lapidarist.
Publican
Philatelist
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A rock
A rock
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A rock
A rockhound is a geologist or rock collector.
COLLECTOR
The base word of "collector" is "collect."
rock