An EXTREMELY RARE AND FAMOUS SPECIMEN, this is "the Romero Amethyst twin" to many collectors. It is a freak of nature in that, for some reason, amethyst has not been foud in Japan-law twinning as with its smoky and clear cousins. Nobody knows why. Yet, here is a true twin, precisely measured to confirm the relevant angles and prove the fact (often, apparent twins simply are out of plane and not true twins). It is a pristine, floater crystals considered to be perhaps the finest miniature sized quartz specimen from Mexico by many collectors. Romero obtained this piece in the early 1980s and I hear fro mother colelctors that offers were often made to trade it out of him at very high prices, but were always politely turned down.This specimen from the Dr Miguel Romero collection was on loan exhibition to the University of Arizona Museum for over a decade, until my purchase of this collection in 2008. It was on display in special cases at the museum, and has since been featured in the book "The Miguel Romero Collection of Mexico Minerals" which we sponsored as a special supplement book (published by the Mineralogical Record in December of 2008) .