Prehnite - Specimen

Locality: Imilchil area, Midelt Province, Drâa-Tafilalet Region, Morocco

Prehnite has the formula Ca₂Al₂Si₃O₁₀(OH)₂, a hardness of 6 to 6.5 and a vitreous, weakly pearly lustre. It forms as a secondary or hydrothermal mineral in veins and cavities in dark volcanic rocks and is a typical product of low-grade metamorphism, often with datolite, calcite, epidote and native copper.

This one of a kind Prehnite mineral specimen from Morocco features a dense mound of pale green to grey-green crystals covering a darker, rough matrix. The growth ranges from short blocky crystals to thicker fan-shaped and rounded formations, with stepped faces, fine striations, and a slightly frosted lustre. Creamy white tips, scattered tan staining, and deeper green areas create natural colour variation across the specimen, while the uneven peaks and crowded crystal coverage give it a rugged display shape from several angles.

Prehnite was named in 1788 by the German mineralogist Abraham Gottlieb Werner in honour of Colonel Hendrik von Prehn (1733–1785), the Cape-born commander of the Dutch garrison at the Cape of Good Hope, who is credited with bringing the first specimens to Europe. It is often cited as the first mineral named after a person. It commonly forms in cavities, veins, and altered volcanic rocks, often alongside minerals such as epidote, calcite and quartz. Moroccan Prehnite specimens are appreciated for their earthy green tones and unusual clustered habits, ranging from smooth botryoidal masses to granular and crystalline coatings.

In crystal traditions, prehnite is associated with calm, intuition and gentle renewal.

Chemical Composition: Ca2Al(AlSi3O10)(OH)2

Quantity: 1pc
With this product, you will get the actual stone in the photograph.