Aragonite and calcite with pocket of calcite rhombs

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Description

Aragonite and calcite with pocket of calcite rhombsLocale: Sidi Ayed, Fs Mekns Region, Morocco Approx dimensions: 3. 5 x 2 x 2" Approx size: 425g (0. 9 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

Rusty orange-brown coloration is iron oxide staining

Approx weight: 44g

you can see the first generation of growth was an icy clear colorless quartz

unpolished) edges and openings revealing the botryoidal prehnite formations

Usually the tip of the quartz point will not be coated with this second generation of growth

which is also commonly sourced from this region

with good symmetry and straight edges

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)

This specimen has an interesting lattice-like formation of small colorless needles that have the same fluorescence as the hyalite—green in the core with icy blue needles poking out

The alternating zones of green and purple muddle to give the material its inky grape-soda appearance

with brief phosphoresce (try it in the dark

The translucent material at the top of this piece has strong UV reaction

Exchange/Return Notes