Quartz (Japan-law twin)

specimen number:
2312567

location:
Ocna de Fier, Severin Co., Romania

description:

Very choice and attractive for this old classic European locality. A large glassy gem colorless Japan law twin quartz crystal coming off matrix with many smaller quartz crystals. In excellent condition.

Ocna de Fier, located in the Cara--Severin County of western Romania, is one of the oldest and most historically significant mining districts in Eastern Europe, with iron and polymetallic extraction dating back to Roman antiquity and experiencing extensive commercial operations through the Austro-Hungarian period into the modern era. Geologically, the area is characterized by a classic skarn deposit where Cretaceous granodiorite and banatite intrusions invaded older Jurassic limestone and metamorphic sequences, creating intense contact metamorphism. Mineralogically, this complex geological setting fostered the formation of an exceptionally diverse array of over one hundred mineral species.

Japan law twinning is a rare and visually striking crystallographic phenomenon in quartz where two crystals are joined together at a precise 84 degree and 33 minute angle, forming a distinct V-shaped or butterfly-like silhouette. This specialized twinning occurs when two individual crystal lattices grow interpenetrated along a specific crystallographic plane, most commonly observed in quartz crystals originating from hydrothermal veins and alpine-type fissures. Although first formally described and studied extensively from classic localities in Japan, such as Otake in Kai Province, this unique twin configuration can be found in rare instances worldwide and is highly prized by mineral collectors for its geometric elegance and symmetry.

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