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An example of crazy paving. Crazy paving is a means of hard-surfacing used outdoors, most frequently in gardens. Paving stones of irregular size and shape are laid in a haphazard manner sometimes with mortar filling the gaps between.
Stone pavers are made of many materials including limestone, bluestone, basalt (such as that from The Palisades used in New York City), sandstone and granite. [19] Travertine is a durable, low-porous stone that stays cool in direct sunlight, making it a popular choice for pool-sides, patios, walkways and outdoor entertainment areas.
Permeable pavement surfaces may be composed of; pervious concrete, porous asphalt, paving stones, or interlocking pavers. [1] Unlike traditional impervious paving materials such as concrete and asphalt, permeable paving systems allow stormwater to percolate and infiltrate through the pavement and into the aggregate layers and/or soil below.
Marleka fairy stone from Stensö in Sweden Iron sulfide concretions, such as the Kansas Pop rocks, consisting of either pyrite and marcasite , are nonmagnetic. [ 79 ] On the other hand, iron sulfide concretions, which either are composed of or contain either pyrrhotite or smythite , will be magnetic to varying degrees. [ 80 ]
The holes are typically 1 ⁄ 4" to 3 ⁄ 4" in diameter and extend through a raised portion centered in the stone. They usually are bored all the way through but some have been found with holes that extend only part of the way through. Many are made from banded slate or other colored hard stone.
As of 2019, two companies are active in quarrying and producing the slate from Buckingham County, Virginia: 1) Buckingham Slate Company, which was purchased in 2018 by Boxley Materials, a regional aggregates producer, and, 2) James River Slate Company which established quarry and mill operations in Arvonia in July 2013 and began marketing this ...
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