mineral

Tumbled prehnite with epidote/inclusions

Prehnite, Ca₂Al(AlSi₃O₁₀)(OH)₂, commonly associated with epidote and chlorite

AI-generated identification · may be incorrect

Pale yellow-green, translucent, waxy to vitreous luster, with dark green-black inclusions and rounded tumbled surfaces. Hardness 6–6.5 Mohs; typically orthorhombic, with indistinct cleavage and specific gravity about 2.8–2.9.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Forms in low-temperature hydrothermal veins and cavities of basaltic and other volcanic rocks, often alongside epidote, zeolites, and quartz. Most specimens formed during relatively young to ancient hydrothermal alteration; exact age requires locality data.

Uses & applications

Used as a lapidary stone for cabochons, beads, and tumbled specimens; attractive inclusion patterns make it popular with mineral collectors, but it has little structural or industrial use.

Geological facts

Prehnite was among the first minerals named after a person, Colonel Hendrik von Prehn. Its botryoidal masses and included epidote can create a distinctive mossy appearance.

Field identification & locations

Identify by its pale green-yellow translucent body, waxy luster, moderate hardness, and dark epidote-like inclusions; verify with locality, hardness, and refractive-index testing because similar serpentine or chalcedony can occur. Common sources include South Africa, Australia, India, China, and the United States.