depot pull
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Weight (specimen only): 331 grams
The formation of dendritic opal involves the infiltration of mineral-rich water into rock cavities
Malachite Rhinoceros Carving
Due to its relatively good hardness compared to some other opals
From the Chibuku Mine in Zimbabwe
7" Septarian Slab DS2236 bone Weight (specimen only): 331 grams7" Septarian Slab Approx. Dimensions: 7x6x0. 5 inches Approx. Weight: 711 grams Locality: Mexico Slab stand is included. Septarian, a distinctive sedimentary rock, forms through the combination of calcite, aragonite, and limestone with organic matter and minerals such as iron sulfide. It develops in concretions within sedimentary deposits, often found in regions with ancient seabeds, notably in Utah, USA, Madagascar, and Morocco. These concretions