Large, white analcime crystals were abundant in the fracture pocket that produced the famous natrolite crystals in 1972 and '78. Some of these were larger than golf balls.
Quality of samples:
not specified / average specimens
Confirmation
Validity:
Believed Valid
References
References:
Tschernich, R. (1992): Zeolites of the World, 67. Warren Cummings, personal communication, 2008