Tsesite 131 grams - Sahara, retailer Algeria

Origin: Sahara, Algeria
Weight: 131 grams
Dimensions: 96 x 68 x 13 mm
No treatment

Marcasite underwent a slow transformation (diagenesis) into goethite. This is a mineral of the class of oxides and hydroxides (FeO(OH) x nH2O + Al + Ca). The shiny layer retailer around the goethite core is called "desert lacquer" and was formed over time, following exposure to the weather, the sand acting as polishing, gave it its shiny appearance. The desert lake layer is very thin and has a hardness of 7.5-8 on the Mohs scale, the Goethite core has a hardness of 5-5.5.

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REF MINE774-05