boxwork


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boxwork

[′bäks‚wərk]
(geology)
Limonite and other minerals which formed at one time as blades or plates along cleavage or fracture planes, after which the intervening material dissolved, leaving the intersecting blades or plates as a network.
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References in periodicals archive ?
Overhead, a rare calcite formation called boxwork looked like spiderwebs, neurons or fiberglass insulation, sealing us off from the world above.
Geologically, there are mineral resources, such as small nickel laterite deposits, thin or boxwork gold veins, alluvial gold panning, clay and gemstones, that may only be economically feasible to develop at a smaller scale.
Silicification is characterized by a slightly boxwork pattern, vuggy silica, relation to pyrite oxidation and association with clay minerals (mainly kaolinite).
This results in low ridges based on fractures but buttressed by iron oxides, silica or carbonate, like the fractures and adjacent sandstone impregnated by haematite-goethite and exposed in shore platforms on the west coast of Eyre Peninsula and the boxwork patterns formed on some granite surfaces.
The boxwork could be related to brecciation and in at least one of the caves these features are found in close proximity to each other.
Boxwork calcite and pyrite have been observed: the host material here was probably clay that occupied the cavity prior to mineralization; dessication of the clay created fractures along which calcite crystals (at Plymouth) and pyrite crystals (at Biggsville) grew.
They include Piccadilly Station,Manchester City Art Gallery,Chorlton Park Housing, the Boxwork and a National Trust property in Cumbria.
within the boxwork alteration rinds increases outward from the nodules
The selenide clots commonly have an irregular boxwork texture developed around the outer zone.
The anglesite forms boxwork replacements of galena in small cavities.
Silicification and boxwork openings after the mineral pyrite (iron sulfide) in the southern feature are encouraging for stronger mineralization at depth.