TD66Q8: Neatly shaped prismatic crystal with a bright and transparent pinacoidal termination. The prismatic faces of the crystal, with a good blue color, are also transparent but they have translucent zones. The lower part of the crystal is naturally corroded due to the contact zones with its matrix. We especially note the locality, very uncommon.
The sample is from the Gary Murdock collection, whose label we will send to the buyer. Previously it was in the University of California (Santa Barbara) collection.
Sawtooth Batholith, Sawtooth Mountains, Boise County, Idaho  USA

Specimen size: 3.7 × 1 × 0.8 cm = 1.46” × 0.39” × 0.31”