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Harmotome - St Andreasberg, Braunlage, Goslar District, Lower Saxony, Germany (TL)
(#:MINS9138)
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,N
2
,K
2
)[Al
2
Si
6
O
16
] * 6 H
2
O
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
Specimen weight:48 gr.
Crystal size:Up to 4 mm wide
Overall size: 55mm x 40 mm x 28 mm
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