A classic (it's from the Type Locality), old-time specimen of lustrous, pearlescent harmotome crystals to 4 mm, on matrix, from St Andreasberg in the Harz Mountains of Germany. Harmotome is a rare zeolite mineral and these bone-white, euhedral crystals are sharp and attractive.
Formula :
(Ba,N2,K2)[Al2Si6O16] * 6 H2O
System: monoclinic Hardness:4½-5 Rarity:rare
Strunz id:VIII/J.25-70 -
SILICATES
Name origin: From the Greek for "joint" and "cutting," as the twin crystals
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 Specimen weight:48 gr.
 Crystal size:Up to 4 mm wide
 Overall size: 55mm x 40 mm x 28 mm
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