Hello ChaoticNRGY!

You have a few choices for rough opal (I'm sure you know this but any other new players who come by this post I'll explain in detail)

    #1: Of course, you can purcahse this from the central market from other players

    #2: You can use a Mining Node and have your workers do the work for you

    #3: You can gather them yourself

For mining nodes you have several options.

Mediah Shore, Pjiyah Canyon, Capotia

For do-it-yourself there is one location where you can gather from

Gavinya Coastal Cliff

Your best resource for finding node information including an iteractive map is somethinglovely. There are alternative websites as well but for this instance take a look at this page: https://www.somethinglovely.net/bdo/#node/1556

North of epheria porrt on the beachrocks or the coast of mediah post, also on the beach. good luck!

Mediah shore node, you can also mine them with worker from node with worker, west from sand grain baazar.