What kind of rock is difficult to sand, and what kind of rock is sandstone

Metamorphic rock. Metamorphic rock. Rocks formed by metamorphism of the original rocks.

According to the different types of metamorphism, metamorphic rocks can be divided into five categories: dynamic metamorphic rocks, contact metamorphic rocks, regional metamorphic rocks, mixed rocks and metasomatic metamorphic rocks. Common metamorphic rocks include mylonite, clastic rock, hornstone, slate, phyllite, schist, gneiss, marble, quartzite, amphibole, schist, dolerite, mixed rock, etc.

Metamorphic rocks occupy the volume of the crust.

Rock has specific physical properties such as specific gravity, porosity, compressive strength and tensile strength, which is a factor that needs to be considered in construction, drilling, excavation and other projects, and is also the carrier of various mineral resources, and different types of rocks contain different minerals. Taking igneous rocks as an example, mafic ultramafic rocks are related to ferrophilic elements, such as chromium, nickel, platinum group elements, titanium, vanadium, iron, etc. Acidic rocks are related to lithophilic primordial elements such as tungsten, tin, molybdenum, beryllium, lithium, niobium, tantalum, and uranium; Diamonds are found only in kimberlite and potash-magnesia porphyry; Chromite is mostly found in pure peridotite; Tungsten-tin deposits are abundant in the early granite of Yanshan in South China; Independent tin ore and niobium, tantalum and beryllium deposits are often formed in the granite of the late Yanshan period. Oil and coal are only found in sedimentary rocks.

Iron ore in Precambrian metamorphic rocks is cosmopolitan. Many rocks themselves are also important industrial raw materials, such as Beijing's white marble (a kind of white marble) is famous for Chinese and foreign building decoration materials, Nanjing's Yuhua stone, Fujian's Shoushan stone, Zhejiang's Qingtian stone is a good arts and crafts stone, even those unnoticed river sand and pebbles are also very useful building materials. Many rocks are also important medicinal raw materials, such as maifan stone (a medium-acid vein) is a very popular medicinal rock.

Rock is also an important factor that constitutes tourism resources, and the world's famous mountains, rivers, strange peaks and caves are all related to rocks. Our ancestors began to use rocks since the Stone Age, and today, with the high development of science and technology, people's clothing, food, housing, transportation, travel, and medical ......None of them can leave the rocks. The study of rocks, the use of rocks, the collection of rocks, the play with stones, and the love of rocks are no longer the patent of scientists, but have gradually become an integral part of the lives of the masses.

Sandstone is a sedimentary clastic rock.

Sandstone is a sedimentary clastic rock composed of components such as quartz and feldspar, which has been weathered in many hilly areas. Corrosion, transportation and other geographical phenomena are piled up. In terms of its components, there are debris and gap fillers combined.

After natural treatment and subsequent processing, it can achieve the characteristics of sound insulation, wear resistance, no melting, and easy cleaning. Sandstone extracted from nature is particularly environmentally friendly and meets the requirements for use.

Characteristics and colors of sandstone

Characteristics of sandstone:

Sandstone is formed by the accumulation of rocks in the basin through weathering, denudation and transport. The rock is made up of two parts: debris and gap filler. In addition to quartz and feldspar, detritals include muscovite, heavy minerals, cuttings, etc.

Common cementations are siliceous and carbonate cementation: heterogeneous components mainly refer to finer clay or silty materials deposited at the same time as the detritus. The composition and structure of the gap filler reflect the geological tectonic environment and physicochemical conditions under which the sandstone was formed.

According to its sedimentary environment, sandstone can be divided into three categories: quartz sandstone, feldspar sandstone and lithic sandstone. Sand and sandstone make up the main reservoirs of oil, gas and groundwater.

Sand and sandstone can be used as abrasives, glass raw materials, and building materials. The sand layer and sandstone of a certain occurrence are rich in placer gold, zircon, diamond, ilmenite, rutile and other placers.

The color of the sandstone:

The color of sandstone depends on the composition and can be any color, the common ones are brown, red, gray and white. Some sandstones are resistant to weathering but are easy to cut, so they are often used as building materials and paving materials.

For example, the grains in quartz sandstone are relatively uniform and hard, so sandstone is also often used as grinding tools. Due to its better permeability, sandstone surface aquifers can filter out contaminants and resist pollution better than other stones such as limestone.

Sandstone is formed from quartz grains (sand) and is structurally stable, usually light brown or red, containing mainly silicon, calcium, clay, and iron oxide. Sandstone is a sedimentary rock, mainly cemented by sand grains, of which the sand content is greater than 50%. The vast majority of sandstone is made up of quartz or feldspar.

Main ingredient A Quartz content more than 52%; b Clay 15% or so; c Goethite 18%; d More than 10% of other substances.

The world's sandstone has been mined and utilized, including Australian sandstone, Indian sandstone, Spanish sandstone, Chinese sandstone, etc. Among them, the most popular color and pattern for architects is Australian sandstone. Australian sandstone is an ecological and environmentally friendly stone, and its products have the characteristics of no pollution, no radiation, no reflection, no weathering, no discoloration, heat absorption, heat preservation, and non-slip.

The more direct way is to add dilute hydrochloric acid, limestone bubbles when it meets dilute hydrochloric acid, and sandstone does not. Or look at the hardness, the hardness of limestone is less than that of sandstone, the hardness of sandstone is general, and the hardness of limestone is generally 3.

The simplest is to drop hydrochloric acid, limestone has bubbles, sandstone does not.

Sandstone is second only to claystone in its distribution among sedimentary rocks.

It is a rock composed of detrital material with a grain size in the range of 2 mm.

In sandstone, the sand content is usually greater than 50%, and the rest is matrix and cement.

The composition of the detritus is mainly quartz and feldspar, followed by various rock chips and mineral detritus such as mica and chlorite.

It belongs to sedimentary rocks.