Hydroxyapophyllite-(K) : KCa4(Si8O20)(OH,F)·8H2O
Prehnite : Ca2Al2Si3O10(OH)2
Photo added to mindat.org
“Apophyllite on Prehnite. Mike Redding specimen (1973) These are a real American classic. Scale at bottom of image is an inch with a rule at one cm.”
Rock Currier - 11th March 2009
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