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How to Tell If a Rock Is Worth Money

When you find an unusual or eye-catching rock and wonder if it might be valuable, the first step is careful observation and …

What is Welo Opal

Welo opal (also spelled Wollo opal) is a type of precious opal mined in Ethiopia’s Wollo Province, near the town of Wegel T…

Three Whale Rock (Hin Sam Wan)

Three Whale Rock ( Hin Sam Wan ) is a spectacular sandstone formation in Phu Singh Forest Park, Bueng Kan Province, northea…

How to Identify Quartz

Learning how to identify quartz is one of the most practical skills in geology and rock collecting. Quartz is among Earth’s…

Tafoni Sandstone: Formation, Characteristics, Examples

Tafoni sandstone refers to ordinary sandstone sculpted by tafoni —networks of rounded hollows, pits, or cavernous cavities…