harmotome


Also found in: Dictionary, Wikipedia.

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.
Mentioned in ?
References in periodicals archive ?
Harmotome ([Ba.sub.0.5],[Ca.sub.0.5],K,Na)[.sub.5][[Al.sub.5][Si.sub.11][O.sub.32]] x 12[H.sub.2]O
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 ?
Zeolite crystals visually identifiable as phillipsite or harmotome are well-known as last-formed minerals in carbonate veins, braunite fractures and tinzenite druses (Antofilli et al., 1983).
It is commonly associated with crystals of quartz, sursassite, rhodochrosite, calcite and, in places, with chalcocite, manganese oxides and harmotome.
A large number of harmotome crystals from microscopic size up to 1 cm have been found, especially from the northern Vinoren area, and also from the southern Vinoren area, in the Gottes Hulfe in der Noth, Mildigkeit Gottes and Kjennerud mines.
Harmotome and barite crystals have been found which equal those found in earlier days, both in size and quality.
Rounded green brochantite crystals to about 0.5 mm occur rarely with serpierite and harmotome in the quartz lining of a large cavity on the Brownley Hill vein.
Harmotome [(BaK).sub.1-2][(Si,Al).sub.8][O.sub.16][cdotp]6[H.sub.2]O
At the Brownley Hill mine, however, harmotome is a late-stage primary vein mineral (D.