What about the land nymphs, could a human date one?
Should they? Well...let's talk about the properties of these nymphs for a second.
Like limniads and dryads, oreads are quite diverse. Some have plates of metal growing on their skin like armor, while others are covered in little crystals or gems. Either way, all oreads have these things in common: they are incredibly strong and incredibly dense.
By that I mean, let's say an oread and a human are standing side by side. They look like they're the exact same size, so they should weigh about the same, right?
Wrong. Whatever that human weighs, the oread weighs about 4x more. She's also about 10x stronger. Any damage her body takes, she can repair by eating whatever element she represents (gold, rubies, quartz, etc.)
So if you want a romantic relationship with an oread, keep in mind that they are WAY heavier than they look and they might accidentally kill you. Because for them, interacting with you is like interacting with a delicate little insect. It would take very little effort on their part to literally crush your bones.
I'm not saying it's impossible for a human to date one of these creatures, I'm just saying there's serious quirks that must be taken into account...
And that's assuming they would want you at all. Oreads are generally distrustful of humans (and all peoples) because they are hunted and exploited for their valuable minerals. The gems and plates that grow on them can be harvested, meaning a lot of shady characters pursue these nymphs with greedy intentions. For this reason, oreads spend most of their time underground, hidden away from peoples. Good luck even finding one to begin with.
On a more positive note, oreads sometimes gift their minerals to people they like. If you stay on their good side, there's a chance you'll end up with a valuable diamond or something. And if you manage to win their love and devotion, who knows what treasures you'll reap?