Phillipsite

specimen number:
2354214

location:
Big Bend, Kimberly, Grant Co., Oregon, USA

description:
An open pocket 2.0 x 1.5 cm in size centered in this basalt matrix is lined with sparkling colorless crystals of phillipsite. In good condition. The specimen comes with a previous collection label from Jack Nieburger, as well as a dealer label from David New.

The Big Bend locality near Kimberly in Grant County, Oregon, is characterized by extensive Cenozoic volcanic and sedimentary rock sequences, notably featuring basaltic flows and tuffaceous deposits laid down during periods of intense regional tectonic and volcanic activity. While the area is not historically recognized as a major commercial mining camp, it has gained notable recognition among mineral collectors and researchers for its micro-mineral occurrences and rockhounding opportunities within these altered volcanic layers. Among the prominent secondary minerals found in the region's cavities and fracture fillings is phillipsite, a well-known member of the zeolite group that forms through the low-temperature alteration of volcanic ash and glass, prized by mineral enthusiasts for its characteristic complex pseudo-tetragonal crystal twinning.

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