harmotome


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harmotome

(ˈhɑːməˌtəʊm)
n
(Minerals) a mineral of the zeolite group consisting of hydrated aluminium barium silicate in the form of monoclinic twinned crystals. Formula: Ba(Al2Si6O16).6H2O
[C19: from French, from Greek harmos a joint + tomē a slice, from temnein to cut]
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Sinter of harmotome, a zeolite produced by hydrothermal alteration of igneous rocks around 200[degrees]C [84], surrounds the hot springs and cavities.
Other than harmotome, brewsterite-Ba is the only barium-dominant zeolite known from the Grenville Province.
Older classification used the name wellsite for a mineral with an intermediate chemical composition between phillipsite and harmotome.
These biggies included matlockite, greenockite, harmotome, susannite, and others from Scottish localities.
Harmotome is extremely rare at the Francon quarry, known from only a few confirmed specimens.
Examples of first-rate Scottish zeolites in the two cases included very large specimens of basalt plates and open tubes lined with lustrous white stilbite "bowties" to 5 cm, thick coverages of lustrous white and colorless chabazite rhombs to 3 cm on matrix, perfect glassy analcime trapezohedrons to 2.5 cm sitting straight up on white calcite druses over basalt, red heulandite and blocky white hydroxylapophyllite crystals in stately groups, and, of course, the classic harmotome from Strontian, in magnificent crystal clusters with individuals to 3 cm across.
Harmotome [([Ba.sub.0.5],[Ca.sub.0.5],K,Na).sub.5] [[Al.sub.5][Si.sub.11][O.sub.32]]*12[H.sub.2]O
Harmotome [([Ba.sub.0.5],[Ca.sub.0.5],K,Na).sub.5][[Al.sub.5][Si.sub.11][O.sub.
Species confirmed by X-ray diffraction during this study include alstonite, anglesite, ankerite, aragonite, barytocalcite, barite, brochantite, epsomite, harmotome, hydromagnesite, jarosite, marcasite, melanterite, millerite, serpierite, siderite, sulfur and witherite.
a collecting effort in May 1998 at the Whitesmith Workings, Beinn Resipol, Strontian, Argyll, Scotland, yielded some spectacular specimens of harmotome from this famous locality for this rare zeolite species.
35 and harmotome) (1997), 1571 Redefinitions Aguilarite Pending Armalcolite Bowles: Am.
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.