Comparison Between Sandstone And Slate

What is sandstone

What is sandstone

These materials eroded from older rocks were sorted and deposited by rain and wind to form beds of layered materials. The sandstone was then formed by a chemical and physical process similar to the formation of limestone. The various minerals, such as iron oxides and carbonates, that leached into the layered sand beds gives sandstone its rich and varied colors.

Sandstone is one of our most plentiful, widely distrubuted, and useful building stones. Many fine public building are constructed with various grades of construction quality sandstone. Some grades of sandstone are also rather easy to carve into decorative forms. Depending upon the hardness and texture, sandstone slabs can be carved into a variety of icons, decorations and forms to enhance the walls, doorways and gateways of castles and other buildings.

What is Slate?

Slate is a metamorphic rock. This means that this fine grained rock is the result of the actions of pressure, heat and water upon clay and silt sediments deposited on ancient sea beds over millions of years ago. Mountain building forces subsequently gradually folded, crumpled and compressed these deposits into the shale. This has resulted in a very compact and highly crystalline rock structure. At the same time the resulting intense heat and pressure changed the orifional clay and silt particles into new minerals such as mica, chlorite, and quartz. Slates vary in composition, structure, color, and durability because of the degree to which their mineral content has been altered and which is neither uniform nor consistant.

The metamorphic process of geologic change necessary to produce slate are dependent upon large scale movements in the earth's crest and the intense heat and extreme pressure generated therein. For this reason, slate is found only in certain mountainous regions of the earth. And only a few areas of these regions have quarries that produce slate suitable for making slate stone for building purposes.

There are three general classifications of slate: mica, clay and igneous. For our discussion we will deal with the mice form. This is because this slate is what slate roofs are made from. Mica is a generic term for any group of minerals that crystallizes in thin easily separated layers. In slate, the mineral is primarily silcon dioxide in the form of crystalline quartz.

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by: nicole

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