colloform

colloform

[′käl·ə‚fȯrm]
(geology)
Pertaining to the rounded, globular texture of mineral formed by colloidal precipitation.
References in periodicals archive ?
Trace and minor element variations and sulfur isotopes in crystalline and colloform ZnS: Incorporation mechanisms and implications for their genesis.
The vein at this position is a quartz-calcite-adularia crustiform vein including amethyst and colloform banding with sulfides.
The manganese mineralization occurs mainly as nodules within the sedimentary section, and both Mn and Fe minerals exhibit colloform textures.
31 g/t silver) while more complex silicified hydrothermal breccias with fragments of banded colloform quartz were encountered in hole NB-12-138 (4.
This mineral assemblage is found in hydrothermal breccia veins and exhibits colloform textures consistent with low-sulphidation epithermal systems.
Ore textures primarily reflect open-space filling phenomena, which includes spectacular, fine to coarse-grained colloform bands of hematite as wall coatings and breccia fillings.
Distinctive, light green, colloform, subcircular, angular and tear drop shaped "fragments" are very common also.
Quartz and limonite breccia contained colloform, comb and cockade textures.
Magnetite commonly forms euhedral aggregates and is present less commonly with colloform habit.
Colloform banding, carbonate replacement textures and delicate crustiform layers of moss adularia are commonly observed.
These bornite ores exhibit bornite and chalcopyrite intergrown in spheroidal and colloform textures.