pinacoid
/pin-uh-koid/US // ˈpɪn əˌkɔɪd //
松果体,针叶树,蛲虫类,蛲虫
Definitions
n.名词 noun
- 1
Crystallography.
- : a form whose faces are parallel to two of the axes.
Examples
The cleavage is perfect parallel to the basal pinacoid, and less marked parallel to the prism.
Acute rhombohedra in combination with the basal pinacoid are also frequent, giving crystals of octahedral aspect.
There is an imperfect cleavage parallel to the basal pinacoid, and the fracture is conchoidal.
All the closed forms are hexagonal bipyramids; the open forms are hexagonal prisms or the basal pinacoid.
Fig. 71 shows a combination of a hexagonal prism (m) with the basal pinacoid (c).
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