Trapezohedral


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Trap`e`zo`he´dral


a.1.Of, pertaining to, or resembling, a trapezohedron.
References in periodicals archive ?
Internal changes from sector-zoning to sigmoidal zoning during growth are attributed to cessation of crystal growth on dodecahedral faces and later growth on trapezohedral faces (Sepahi, 2007.
Thomsonite varies in habit showing bladed crystals, spherulites, radial crystal groups and rich coatings mainly made up of small crystals, although it sometimes has a fibrous nature Analcime appears as vitreous and granular well-formed trapezohedral crystals which are often colourless and sometimes white Natrolite is generally beige to white, either massive or forming radiating fibers and shows a more glassy brightness than mesolite, which is generally milky white and fibrous, having larger fibers than those of natrolite Stilbite commonly occurs as vitreous sheaves or plates, ranging from colourless to green to white
1) Transparent trapezohedral topazolite crystals showing at the center a large green demantoid phantom with dodecahedral form.
The last important pegmatite mined in this area, known as the Antsotsara pegmatite, is a small vein producing numerous, good-quality trapezohedral crystals of almandine.
Brilliant dodecahedral, trapezohedral and combined-form andradite crystals to 3 cm occur as sparkling blankets and isolated individuals on pale green matrix consisting mostly of massive andradite.
Most recently, remarkable, partially gemmy, trapezohedral spessartine crystals of a bright mandarin-orange color, up to the size of baseballs, have been found about 35 km northeast of Loliondo, close to the Kenya border.
Opaque brown andradite crystals, most commonly rhombic-dodecahedral, are not uncommon in the mine, but the beautiful, gemmy green trapezohedral crystals of the demantoid variety are extremely rare.