This guide brings together everything worth knowing about rockhounding in Arkansas — the best digging sites, the rocks and minerals you can realistically find, and …
Opal is hydrated silica (SiO₂·nH₂O), a mineraloid with no crystal structure that can hold up to about 20% water. It rates 5.5–6 on the Mohs …
This guide brings together everything worth knowing about rockhounding in Michigan — the best beaches and mine districts, the rocks and minerals you can realistically …
Petrified wood is a fossil in which the original wood has been replaced by minerals, mostly quartz, while keeping its rings and grain. Silica-rich pieces …
A geode is a hollow, roughly spherical rock – usually formed from a gas bubble in volcanic rock or a cavity in sedimentary limestone – …
This guide brings together everything worth knowing about rockhounding in Colorado — the best sites, the rocks and minerals you can realistically find, and what …
This guide brings together everything worth knowing about rockhounding in Oregon — the best inland sites and beaches, the rocks and minerals you can realistically …