Madagascar Amphibole in Quartz (Sunset Quartz) 8.5mm Bracelet Inner diameter approximately 16.5cm Purchased from Yuuseian. Beautiful stones with no cracks or chips, and a soft, gentle orange color that is lovely. I am selling this as I am downsizing my mineral collection. Amphibole Quartz has a charming nickname, "Rabbit Rutile," and is a natural stone in which amphibole is included during the growth of quartz. There are various color variations, and red Amphibole Quartz is a result of discoloration due to the presence of iron.