scalenohedron


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Related to scalenohedron: rhombohedron, Pyritohedron

scalenohedron

[skə′lē·nō′hē·drən]
(crystallography)
A closed crystal form whose faces are scalene triangles.
References in periodicals archive ?
The Pallaflat mines (including the Southam pit and the Syke House pit) are famous for superb specimens of calcite in a variety of habits and combinations of rhombohedrons and scalenohedrons.
Microscopic euhedral quartz (II) crystals also occur scattered about the surface of the calcite scalenohedrons, and tiny quartz (II) crystals commonly cluster around the sheaf-like bundles of goethite (Fig.
Not only could Hauy cleave a calcite scalenohedron down until the rhombohedron emerged, but he could also derive the scalenohedral shape by stacking up tiny rhombohedrons in parallel (Hauy, 1801).
The transparent, medium-lustrous, Japan-law twins reach 12 cm across the wingtips; they are purplish towards their terminations, grading to colorless further down, and they have partial coatings of tiny, spiky, white calcite scalenohedrons.
Multiple generations of quartz (fine-grained, doubly terminated crystals, to large, transparent or milky crystals, to late amethystine scepters) and calcite (rhombohedrons, scalenohedrons, platy and hexagonal prisms) are common in most cavities.
The original calcite crystals, individually reaching 5 cm, were scalenohedrons with blunt trigonal terminations; the very sharp forms of these crystals are now memorialized by thin, silky yellow-brown to dark brown, hollow molds.
Calcite is encountered very frequently in the Fengjiashan mine, a first generation occurring as squat rhombohedrons and a second generation as steep scalenohedrons.
In January 2006 the Mohodari quarry near Nasik produced a handful of spectacular large-cabinet calcite specimens, with lustrous, translucent yellow-brown rhombohedrons and modified scalenohedrons, reaching 15 cm individually, resting lightly on basaltic matrix.
At the circle's center is a vertical aggregate of terraced scalenohedrons ending in a spearpoint.
Calcite is uncommon in veins, occurring as colorless to white, rarely yellow, scalenohedrons formed in the middle stage of mineralization.
This quarry is best known for its outstanding datolite and (rarely) babingtonite specimens, but these new white, translucent scalenohedrons and compound scalenohedrons of calcite, reaching 10 cm, are no poor sisters either.