scalenohedron


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Related to scalenohedron: rhombohedron, Pyritohedron

scalenohedron

(ˌskeɪliːnəˈhiːdrən)
n, pl -drons or -dra (-drə)
a pyramidal form of the rhombohedral system in which the faces form scalene triangles
References in periodicals archive ?
Calcite crystals occur in a wide variety of habits, the scalenohedron and rhombohedron being the most common forms.
Crystal habits range from elongated hexagonal prisms with low-angle rhombohedron terminations to prism and scalenohedron combinations in varying proportions.
It occurs in a wide variety of habits, but the scalenohedron and rhombohedron are the most common forms.
4) Continuing formation of quartz, (II) so as to enclose some goethite sprays; during this interval sparse microscopic quartz (II) also grew upon the calcite scalenohedron {21[bar.
Forms like the scalenohedron can be generated by stacking tiny rhombohedrons in a certain way.
obtuse rhombohedron-- flattened III {h0-h1} obtuse rhombohedron colorless to white, locally coated "pseudocubic" with brown iridescent material IV {h0-h1} obtuse rhombohedron colorless V globular clusters white VI {hk-il} acute scalenohedron colorless to white VII {hk-i1}, {h0-h1} obtuse colorless to white scalenohedron modified by obtuse rhombohedron Quarries Where Type Crystal Forms Color (UV) Observed* I {h0-h1} obtuse rhombohedron yellow BG, PL "pseudocubic" II {h0-h1}, {0k-k1} pos.
Microsparite and sparite calcite crystals are mostly equant to elongated rhombohedrons or scalenohedrons, but also a few prismatic crystals were observed.
The big calcite crystals are highly lustrous and limpidly colorless and transparent; some are fat scalenohedrons while others are face-rich, complex, nearly equant forms of generally rhombohedral aspect.
It forms crusts of white opaque or colorless to yellow transparent scalenohedrons and other crystal habits, usually less than 2 cm long and commonly exhibiting an orange fluorescence.
Calcite from the locality forms clean, pretty, compound "dogtooth" crystals composed of scalenohedrons in parallel growth, pale orange and translucent and reaching 5 cm; matrix specimens reach 10 cm.
The manganese-tinted calcite in these pieces forms highly lustrous, translucent to transparent, very pale pinkish purple, twinned scalenohedrons reaching 25 cm long.