Prase Quartz

Prase Quartz is a leek-green variety of macrocrystalline quartz, its color produced not by chemical substitution but by dense networks of acicular actinolite inclusions (occasionally crossite) threaded through an otherwise colorless silica lattice. The name derives from the Greek word for leek, and the classic German mineralogical term "Prasem" already described this actinolite-included quartz over a century ago. Because the color is inclusion-based rather than a true structural variety, prase is mineralogically distinct from prasiolite (heat-treated, iron-bearing green amethyst) and from plasma (a green chalcedony), a distinction serious collectors and dealers are careful to maintain.

The type locality prized above all others is Serifos Island in the Cyclades, Greece, particularly the skarn deposits near Megalo Chorio (Mega Horio). Here prase quartz formed in calc-silicate skarn zones alongside hedenbergite, andradite garnet, platy calcite, and sprays of metallic hematite rosettes that often accent the green prismatic crystals. Serifos is uniquely famous for bicolor "rocket" crystals and scepters combining green prase bases with violet amethyst terminations, a pairing electron-microprobe studies attribute to two successive generations of actinolite growth followed by iron-driven amethyst coloration in the same fluid system. Material was worked intensively in the late 1980s and early 1990s and continues to surface from renewed digging, making fine Serifos prase-amethyst combinations among the most sought-after Greek mineral specimens on the international market.

Beyond Serifos, prase-colored quartz has been documented from scattered but notable occurrences, including the Vallone Stope at Cape Calamita on Elba, Italy, and the Sinerechenskoe skarn near Kavalerovo in Primorsky Krai, Russia, each yielding its own textures and inclusion assemblages within the broader amphibole group. Historically, the varietal name was also applied loosely to leek-green micro-crystalline quartzite and jasper, though today the term is reserved by most collectors for genuinely included, gem-quality quartz crystals. For mineral collectors, prase quartz offers a rare combination of transparency, saturated natural green color, and visible fibrous mineral inclusions, qualities that place fine Serifos druses and scepters firmly among the classic, display-worthy specimens of the quartz family alongside amethyst, citrine, and smoky quartz.