3. Pegmatite Formed during the final stage to where crystallization of magma occurs, they are known as to carrying several minerals rarely found within the other types and kinds of rocks presented. Abundant, they are most well-known to be located by the Western Australia, specifically at Yilgarn Carton. Relatively strong as they are ranked seven by the Mohs scale, it is resistant to heat, impact, and pressure however, not resistant to acid and wind. Coarse-grained, plutonic, opaque, and light-hued, they are oftentimes referred also to as crystals. Mainly used also as building stones, paving stones, and facing stones, they are also used in curbing. Interior wise, they are mostly used as decorative aggregates, and flooring. To some, they are oftentimes used for sculptures and creating jewelries. The following photos illustrate its function: METAMORPHIC ROCKSFormally known as given rocks that have been a product of mutating a former rock with the aid of high temperature and pressure, here are the following examples of it: 1. Marble Metamorphic rock that is non-foliated, formed to when a limestone is subjected to a high temperature, it is mainly composed of mineral calcite, and other minerals i.e. clay minerals, iron oxides, micas, graphite, quartz, and pyrite. Though found in many parts of the world, they are more common within the United States, and the mass-producing companies of marbles are located in Alabama, Colorado, Tennessee, Montana, Vermont, and Texas. In terms of nature, there is a famous site entitled to as the Marble Rocks by the Narmada River at Central India, near the city of Jabalpur. Having a rank three to five within the Mohs scale, they are not that strong however, they are durable for being resistant to water, scratch, and stain. Coarse as they are with a sugary texture, they come in different light hues.More common within the field of architecture, having both Taj Mahal, Washington Monument, Lincoln Memorial, and the Supreme Court Building of America made extensively of the said rock. Oftentimes, they are used as stair treads, risers, facing stone for an infrastructure as well as building stones, garden décor, paving stone and even flooring tiles. They are also most likely used for interior, preferably so in the bathroom, table countertops, entryways, and decorative aggravates such as statues or sculptures. The following photo illustrate its function. 2. Hornfels Fine-grained, dark-hued, dull, and with no specific composition non-foliated metamorphic rock, its origin comes from New Zealand, they are basically from rocks that were heated within the perimeter of a magma chamber, dike or sill. Ranked by the Mohs scale as two to three, they are not resistant to scratch, stain, wind, and acid, however they are resilient to water. Used as building, facing, paving stones, and as garden décor, gabions and of office buildings, they are also used as an aggregate for roads. With the rock also practiced for curbing, they are also applicable as decorative aggregates, flooring, and interior decoration. The following photos illustrate its function: 3. Quartzite As a product of a metamorphosed sandstone, they are predominantly composed of quartz, thus its name’s origin. Famously located at Chimney Rock Formation in Catoctin Mountain Park at Maryland. Durable and hard with a rank of six to seven in Mohs scale, they are resistant to acid, scratch, stain, water and wind, having it almost no weakness. Foliated, granular, and lustrous, it is mainly dark-hued having to several diverse colors such as black, brown, blue, yellow, white, purple, and the most common, light grey.Used as curbing, they are mostly used as building stones, may it be its facing too, and of course, for paving. To the construction industry, they are widely use and to name the few, they are; dimension stones, construction aggregate, cutting tool, and road aggregate. Their usage has not rest there for they are at times used for jewelries, monuments, and sculpture. The following photos illustrate its function. SEDIMENTARY ROCKSWith the aid of pressure, they are rocks formed by the sedimentation of material by the Earth’s surface and the bodies of water. Here are some of these examples:1. Sandstone Composed of minute grains of innumerable minerals in an uniform manner, they are mostly collected underground to where several parts of the Earth’s surface and water will meet, they are the most common type of sedimentary rocks. Clastic, granular and rough, they are ranked by their hardness around 6 to 7, having them resistant to water, scratch, acid, and wind however not resisting to stain. They come in different hues such as beige, brown, cream, dark brown, grey, pink, and white. Use as aquifers for groundwater, reservoir for oil and natural gas, they are also as building stones, road aggregate, production of ceramics and glass, and curbing. For the interior are they mostly used as countertops, interior decorative, and ornamental artifacts monuments and sculptures. The following photos illustrate its function. 2. Limestone Product of predominantly of aragonite and calcite, they originated in New Zealand, these stones mostly form at islands around Pacific Ocean considering they are abundant with the Earth having lots of limestone-forming settings. Fine-grained, opaque with several hues of beige, black, brown, gold, green, and even rust, they are ranked as 3 to 4 in Mohs scale, having them resistant to scratch and stain, however not to acid, water, and wind.Primarily used as building stones, curbing, to manufacturing cements, cobblestones, and aggregate for roads, they are also used in interior as decorative aggregates. The following photos illustrate its function: 3. Siltstone With the origin of its name, they are composed mainly of silt-sized particles to where it Is a product to where wind, water, and ice-deposit silt are compacted and cemented. Fine-grained, rough, and opaque they come in hues of brown, red, or at times reddish brown. Found in stream deposits, or in lake beds, they are abundant around Kansas.