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Description

Aragonite and calcite (repaired)Locale: Sidi Ayed, Fs Mekns Region, Morocco Approx dimensions: 3. 5 x 2 x 1. 5" Approx size: 285g **Repaired specimen 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

The larger crystals display milky white phantoms inside colorless quartz

The tip of the point is obscured by this growth

I have not been able to find info on common associates of this material) that appears to have calcite underneath

This large glossy black tourmaline

This variety of aragonite clusters earns its trade name from the resemblance to the Sputnik satellite

This specimen has a cluster of intersecting hydroxyapophyllite crystals topped with a cluster of small scalenohedral calcite crystals

It appears aragonite formed over calcite points which then partially dissipated

In this case the thousand layer growth is a pinkish hue tinged with white

the white quartz layer fluoresces white and the calcite has a strong orange-red reaction with phosphorescence

Approx point length: 4"

The matrix is partially calcite

Rhyolite is in the family tree