Zirconolite-3O

specimen number:
2062698

location:
Klastad Quarry, Tjolling, Larvik, Vestfold, Norway

description:
Black prismatic crystal measuring 1.3 cm in length embedded flat up on matrix. In good condition.

The Klastad Quarry in Tjolling, Larvik, Vestfold, Norway, is located within the Oslo Rift region, an area renowned for its complex alkaline igneous rocks and associated pegmatites. These quarries primarily extract larvikite, a coarse-grained monzonitic rock widely used for dimension stone and aggregate. Within the localized pegmatitic zones of this district, mineral collectors and researchers have discovered a variety of rare oxide and accessory phases, including the rare polytype zirconolite-3O. This specific crystalline variety occurs as dark, complex oxide components embedded within the alkaline intrusive environment, drawing ongoing interest from mineralogists studying the diverse accessory assemblage of the region.

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