Tectosilicate (framework silicate), zeolite group, barium mineral
Specific gravity: 2.41 to 2.47
Hardness: 4 to 5
Colour: Colourless, white, grey, pink, yellow, brown
Sedimentary environments (rarely)
Harmotome occurs in basaltic cavities associated with calcite and rarely
natrolite. It has also been reported in
associated with calcite, laumontite and
(DHZ 4 p398).
At Nisikkatch lake, Saskatchewan, Canada, harmotome occurs in veins in gneiss associated with hyalophane (variety of microcline) and albite (DHZ 4 p398).
In northern Italy harmotome occurs in graphite lenses in gneiss with quartz, sphalerite and galena (DHZ 4 p398).
In the Ural mountains, Russia, harmotome occurs in bauxite with kaolinite and halloysite (DHZ 4 p398).
At Snailbeach mine, near Minsterley, Shropshire, England, UK, harmotome occurs with calcite (RES p273).
At the Struy lead mines, Inverness, Scotland, UK, harmotome occurs in hydrothermal veins with sphalerite, baryte and calcite (DHZ 4 p398).
Common impurities: Na,Ca
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