Specimen ID: AE6-YXF

Hydroxyapophyllite-(K) : KCa4(Si8O20)(OH,F)·8H2O
Mindat locality:

Photo added to mindat.org

The most elegant aspect of these crystals is their elongated prismatic habit, with multiple (ideally 24, if my crystallography is correct) faces around the prism zone. SHAPE drawings are probably accurate but are not based on goniometric measurements of the prism/diprism face angles.
R. Peter Richards - 12th November 2014
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