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and energy
the best McEarl specimens tend to be exceptionally symmetrical and quite consistent in width throughout their bodies until the point of termination (which can often be piercingly sharp)
3/4” approximate size
doesn’t mean you’re limited to a bottle and a mixer
around the world have at least one fossil from the Green River Formation in their collections
Prehnite astronomy book and energyPrehnite is a calcium aluminum silicate with the chemical composition Ca2Al(AlSi3O10)(OH)2. It generally occurs as volcanic cavity infillings, and typically is a shade between yellow and green, however colorless and blue specimens are not unheard of. The stone has a soft, velvety look to it. Prehnite as a species seems to rarely form what we would call "sharp, discrete crystals" as opposed to gorgeous ball like aggregates and rolling plates. When they