Mineral

https://en.wikipedia.org/wiki/Mineral
https://www.mindat.org/

Web
http://www.mineralweb.com
http://webmineral.com/

Net
http://www.minerals.net/

Ima
https://www.ima-mineralogy.org

Rock
http://www.gemrock.net/
http://www.rocksinmyheadtoo.com/
http://www.rocksandminerals4u.com/