• "Herkimer diamonds" quartz, double terminations - gem formation

    Quartz – Natural, Rough, Colorless

    Terminations are flat surfaces or faces at the ends of crystals. Crystals with terminations on just one end are called singly terminated. The other end is either attached to a matrix or lacks faces. Crystals with terminations at both ends, like those shown here, are called doubly terminated. Set of 7 "Herkimer diamonds" (quartz). Herkimer Co., New York, USA. © Rob Lavinsky, www.iRocks.com. Used with permission.

    Article: Gem Formation: How are Gemstones Created?

    Credit: www.iRocks.com

    Natural or man madeNatural
    OriginUnited States
    Origin detailsHerkimer Co., New York
    Gem StateRough