Science: Rare Purple Seam Agate. Variety of chalcedony. Silica rich groundwater seeps through cracks depositing layers of microcrystalline quartz. Purple color is due to iron-rich minerals. 
Magic: Receptive. This stone speaks a calm, grounded energy with a magnetic and inward focused quality. Suitable for meditation, emotional healing, inner peace, spiritual growth, and dream work. 
Origin: Durango, Mexico, 1960s
Hardness 6.5 Mohs 
Size: 41.75mm X 28.33mm Girdle  3.5mm Height 5.53mm
Special Notes: Purple Quartz does tend to fade with color if left in the sunlight. It's called photodegradation. Look it up.