It often forms as prismatic crystals with a square or rectangular cross-section

Size: 25x17

Name: Gyrolite on Prehnite

effectively reducing stress

Zoned Amethyst Lapidary, Mineral Crystal, Thunder Bay, Ontario, Canada | SO24 L5-6 It often forms as prismaticName: Zoned Amethyst Specimen Size: Large Cabinet Sized Dimensions: 190x58x43 mm 7. 5x2. 3x1. 7 inches Weight: 700 Grams 1 lb 8 ounces Origin: Mined in Thunder Bay, Ontario, Canada This is a complete large zoned amethyst quartz crystals from Thunder Bay Ontario area. It features chevrons of deep purple color followed by bands of lavender and white, a quality lapidary material.