harmotome


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harmotome

[′här·mə‚tōm]
(mineralogy)
(K,Ba)(Al,Si)2(Si6O16)·6H2O A zeolite mineral with ion-exchange properties that forms cruciform twin crystals. Also known as cross-stone.
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At locality 65 harmotome occurs as equant to long-prismatic, colorless to white, twinned euhedral crystals and divergent aggregates to 2 mm associated with fibrous white spherules of allanite-(Ce), fluorite, calcite, pyrite and montmorillonite in voids in brecciated feldspar.
Here, harmotome crystals occur on brecciated, etched feldspar with calcite, fluorite, cerian epidote/allanite-(Ce), chlorite and pyrite.
ER Halloysite VR VR VR VR Halotrichite VR VR VR Harmotome ER ER Hematite C C Hochelagaite ER ER Humboldtine ER ?
It is commonly associated with crystals of quartz, sursassite, rhodochrosite, calcite and, in places, with chalcocite, manganese oxides and harmotome.
Harmotome and barite crystals have been found which equal those found in earlier days, both in size and quality.
5 mm occur rarely with serpierite and harmotome in the quartz lining of a large cavity on the Brownley Hill vein.
At the Brownley Hill mine, however, harmotome is a late-stage primary vein mineral (D.
Harmotome occurs as colorless to white prismatic crystals, with characteristic cross-shaped terminations, rarely exceeding 1 mm, in a large quartz-lined cavity on the Brownley Hill vein (area B in Fig.
Specially notable are microcrystals of samsonite, pyrostilpnite and pyrargyrite, large masses of alabandite, crude pinkish gray crystals of wenkite up to 1 cm and apophyllite in colorless to white crystals up to 2 cm, rarely associated with white harmotome crystals of the same size.