Stone and Rock Types
A variety of igneous, metamorphic, and sedimentary rocks are used as structural and decorative dimension stone. These rock types are more commonly known as granite, limestone, marble, travertine, quartz-based stone (sandstone, quartzite) and slate. Other varieties of dimension stone that are normally considered to be special minor types include alabaster (massive gypsum), soapstone (massive talc), serpentine and various products fashid from natural stone.
A variety of finishes can be applied to dimension stone to achieve diverse architectural and aesthetic effects. These finishes include, but are not limited to, the following. A polished finish gives the surface a high luster and strong reflection of incident light (almost mirror-like). A honed finish provides a smooth, satin-like ("eggshell"), nonreflective surface. More textured finishes include bush-hammered, sandblasted, and thermal. A bush-hammered finish, similar to a houndstooth pattern, creates a rough, but uniformly patterned surface with impact tools varying in coarseness. A sandblasted surface provides an irregular pitted surface by impacting sand or metal particles at high velocity against a stone surface. A thermal (or flamed) finish produces a textured, nonreflective surface with only a few reflections from cleavage faces, by applying a high-temperature flame. This finish may change the natural color of the stone depending on mineralogical composition, particularly with stones containing higher levels of iron.
The most easily accessible general (non-graphic) references are the latest Minerals Yearbook Chapter (production and foreign trade, with statistics), and the latest (Issue 31) Dimension Stone Advocate News (new "building green" developments and demand statistics); see below. The most comprehensive, graphic references are Natural Stone Database by Abraxas Verlag (www.natural-stone-database.com), "Dimension Stones of the World, Volumes I & II" (Marble Institute of America) and "Natural Stones Worldwide CD" (Abraxas Verlag GmbH).
Read more about this topic: Dimension Stone
Famous quotes containing the words stone and, stone, rock and/or types:
“Here [in London, history] ... seemed the very fabric of things, as if the city were a single growth of stone and brick, uncounted strata of message and meaning, age upon age, generated over the centuries to the dictates of some now all-but-unreadable DNA of commerce and empire.”
—William Gibson (b. 1948)
“It was a cruel city, but it was a lovely one, a savage city, yet it had such tenderness, a bitter, harsh, and violent catacomb of stone and steel and tunneled rock, slashed savagely with light, and roaring, fighting a constant ceaseless warfare of men and of machinery; and yet it was so sweetly and so delicately pulsed, as full of warmth, of passion, and of love, as it was full of hate.”
—Thomas Wolfe (1900–1938)
“The acorn’s not yet
Fallen from the tree
That’s to grow the wood,
That’s to make the cradle,
That’s to rock the bairn,
That’s to grow a man,
That’s to lay me.”
—Unknown. The Cauld Lad of Hilton or, The Wandering Spectre (l. 2–8)
“As for types like my own, obscurely motivated by the conviction that our existence was worthless if we didn’t make a turning point of it, we were assigned to the humanities, to poetry, philosophy, painting—the nursery games of humankind, which had to be left behind when the age of science began. The humanities would be called upon to choose a wallpaper for the crypt, as the end drew near.”
—Saul Bellow (b. 1915)