Aragonite and calcite with botryoidal side Inner Mongolian quartz and a later generation of

and a later generation of growth deposited the less common hyalite on the underside of the specimen

The crystals are attached to a matrix of light-colored grainy rock

it is more appropriately called hedenbergite quartz

The matte brown mineral coating the specimen is lizardite

but it can range into green or a bold contrast of black

Aragonite and calcite with botryoidal side Inner Mongolian quartz and a later generation ofLocale: Sidi Ayed, Fs Mekns Region, Morocco Approx dimensions: 3 x 2. 75 x 2" Approx size: 480g (1 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 chemical