pinacoidal


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pinacoidal

(ˌpɪnəˈkɔɪdəl)
adj
(Chemistry) crystallog belonging or relating to a pinacoid
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The crystals are rich in faces (terminated by a combination of two pyramids and a very small pinacoidal face) and are elongated, often resembling a rocket shape.
2 kg and consisted of a pinacoidal termination on the core of a giant, heavily etched crystal estimated to have originally weighed between 15 and 30 kg.
Individual crystals typically have a variety of habits, from simple hexagonal prisms with basal pinacoids to complex combinations of pyramidal and pinacoidal faces.
Barium-dominant brewsterite occurs in cavities in prehnite at locality 97, where it forms pale yellow to colorless pinacoidal crystals and aggregates to 1 mm associated with prehnite, quartz, diopside, calcite, wollastonite and microcline.
The smaller crystals are well-formed, hexagonal prisms with pinacoidal termination faces whereas the larger ones are cavernous.
The most common habit of calcite-II has short prisms with rounded pinacoidal terminations which are typically opaque white.
Most anatase crystals are of typical dipyramidal habit, although pinacoidal crystals are also found.
The first generation, forming before the beginning of quartz crystal growth, appears as massive grains or pinacoidal crystals; it is opaque, and very dark brown to medium brown and yellowish.
Prismatic crystals are generally terminated by the first-order pyramid {1011} or second-order pyramid {1121}, with both frequently being present on a single crystal, often modified by the pinacoidal base {0001}.
Other new items of interest from Tysons' include some gypsum crystals from near Hines Creek, Alberta, which occur as simple prismatic and pinacoidal crystals and as "fishtail" twins to 20 cm long; pistachio-green epidote crystals (to l cm) on quartz crystals from Saward, British Columbia; more excellent magnesite and dolomite crystals from Mount Brussilof, near Radium, British Columbia; and more of the branching groups of stacked, white cubic halite crystals from Rocanville, Saskatchewan.
Jaguaracu milarite shows enrichment in Y and rare-earth elements in the outermost zones, in networks of fracture fillings, and in replacement veinlets of a (Y,REE)-rich, Alpoor phase in the primary (Y,REE)-poor crystal interiors and pinacoidal cap zones.