Analcime is found as small water-clear trapezohedra, occasionally with white cores, and often with square c-faces. Larger crystals are usually crackled and clouded. It is associated with most other minerals, but less common in vugs, and analcime is the mineral most likely to be found coating old fractures.
Below: Unidentified white mineral (possibly thomsonite?) in analcime. Width of view 3mm.
