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Granite is typical of a larger family of granitic rocks, or granitoids, that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase (the QAPF classification), with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few (known as leucogranites) contain almost no dark minerals.

 

Thin section of granite

Granite is nearly always massive (lacking any internal structures), hard, and tough. These properties have made granite a widespread construction stone throughout human history.

Engineered stone

 

Also called engineered stone, quartz is a relatively new option for countertops and has found a loyal following for their many good qualities.

 

Durable and beautiful with extensive design options, quartz is a popular alternative to granite and marble with many advantages over most other countertop materials.

 

What makes quartz countertops so special? While quartz is a natural stone, quartz countertops are a manmade blend of stone and durable polymers. This unique fusion makes quartz an excellent choice for your kitchen or bathrooms.

Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite. Marble is typically not foliated, although there are exceptions. In geology, the term marble refers to metamorphosed limestone, but its use in stonemasonry more broadly encompasses unmetamorphosed limestone.[1] Marble is commonly used for sculpture and as a building material

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Marble is a rock resulting from metamorphism of sedimentary carbonate rocks, most commonly limestone or dolomite rock. Pure white marble is the result of metamorphism of a very pure (silicate-poor) limestone or dolomite protolith.

Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone.[1][2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts. Pure quartzite is usually white to grey, though quartzites often occur in various shades of pink and red due to varying amounts of hematite. Other colors, such as yellow, green, blue and orange, are due to other minerals.

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The term quartzite is also sometimes used for very hard but unmetamorphosed sandstones that are composed of quartz grains thoroughly cemented with additional quartz. Such sedimentary rock has come to be described as orthoquartzite to distinguish it from metamorphic quartzite, which is sometimes called metaquartzite to emphasize its metamorphic origins.[3][4]

Dolomite (also known as dolomite rock, dolostone or dolomitic rock) is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite, CaMg(CO3)2. It occurs widely, often in association with limestone and evaporites, though it is less abundant than limestone and rare in Cenozoic rock beds (beds less than about 65 million years in age). The first geologist to distinguish dolomite rock from limestone was Belsazar Hacquet in 1778.[1]

Most dolomite was formed as a magnesium replacement of limestone or of lime mud before lithification.[2] The geological process of conversion of calcite to dolomite is known as dolomitization and any intermediate product is known as dolomitic limestone.[3][4] The "dolomite problem" refers to the vast worldwide depositions of dolomite in the past geologic record in contrast to the limited amounts of dolomite formed in modern times.[5][6] Recent research has revealed sulfate-reducing bacteria living in anoxic conditions precipitate dolomite which indicates that some past dolomite deposits may be due to microbial activity.[7][8]