Webmineral.com has been serving the mineralogy community since 2000, making it one of the older dedicated reference sites on the web. For an educational resource that doesn't ask for payments or personal data, that kind of longevity is a strong indicator of legitimacy. Most reputable academic or hobby sites in this space operate for years without major overhauls, and the consistent archive history back to 2000 backs up the site's claims.
So is webmineral.com a scam? No. The operators openly list contact information and a legal business disclosure. While the site lacks a privacy policy and terms of service, that's normal for a non-commercial information site. The only real caution is that it hasn't been updated since 2012, so some data may be dated. But for general mineral lookup and image references, webmineral.com reviews from users are scarce because the site just quietly does its job. If you're looking for crystallography data or species descriptions, it's a perfectly safe and trustworthy resource.