In Search of Datolite Twins

摘要

The story begins long ago - a reference to datolite twins from a trap rock quarry in Westfield, Massachusetts. (See Whitlock, Datolite from Westfield, Mass., 1905. I can't honestly say I have seen even a moderately suspicious example of a twin in datolite from anywhere until recently (2009). Because of my interest in Russian minerals, along with a collection of over 30 datolite examples from the Bor pit at Dalnegorsk, it comes to me as a challenge to try and find a twin for my collection.