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The opaque white mineral is albite and the black is schorl (black tourmaline)
Approx weight: 113g
with three rows of white spots down its back
some featuring a faint version of the color-zoned 'sandwich' habit common to this region (where the main faces are slightly lighter in color like a slice of bread on each side of a darker center)
typically cyanobacteria
Aragonite and calcite Ferruginous quartz The opaque white mineral isLocale: Sidi Ayed, Fs Mekns Region, Morocco Approx dimensions: 3. 75 x 2. 5 x 2 Approx size: 700g (1. 5 lb) Calcite and aragonite are polymorphs of one another, meaning that the same chemical composition (calcium carbonate) has crystallized into different crystal structures (trigonal and orthorhombic, respectively). Calcite and aragonite often grow together, and the two minerals are also frequent paramorphs of one anothera pseudomorph of the same
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