500000 in stock

SKU: RS0370 Category:


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All our rocks are carefully selected for educational study. They come in labelled trays. The trays are normally 3″ x 2″ size depending on the rarity of the specimen. Average specimen size is shown below. These are ideal for classroom teaching and are a size that can be easily passed round the classroom for students to get a feel for each type.

Chert is a hard, fine-grained sedimentary rock composed of microcrystalline crystals of quartz, the mineral form of silicon dioxide. Chert is characteristically of biological origin but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood.

Approx: 30-40mm