Quartz "casts" after Calcite on matrix Eudialyte so it's a big deal

so it's a big deal when you find crystals like this which are so unblemished and bright

and it's nearly doubly terminated

The Brookites are fine quality

inclusions of Hematite floating inside of it

The stone has very

Quartz "casts" after Calcite on matrix Eudialyte so it's a big dealA really cool "cast" (sometimes call an epimorph, but some people are now calling them perimorphs) from our beloved San Juan Mountains of Colorado. This piece is from the famous Mineral Farm locality near Ouray. What I love about this specimen is the fact that multiple generations of crystallization took place. The topmost layer features sparkling, drusy white Quartz crystals which have formed complete "casts" after preexisting scalenohedral Calcite.