Amphibolite

Amphiboleschis

 Hornblendite

Classification：Igneous Rock

Hornblende rock, also known as "ordinary amphibolite", is a class of amphibole minerals. Amphibolite is usually found in metamorphic rocks and igneous rocks. It is one of the widely distributed rock forming minerals.

Brief introduction:
Ordinary hornblende is a class of amphibole minerals. It does not refer to a mineral. Such as calcium magnesium hastingsite, edenite, pargasite belong to hornblende.
Common amphibolite usually occurs in metamorphic and igneous rocks, and is one of the most widely distributed rocks. The metamorphic rocks with a large number of common hornblende are called amphibolite.
Hornblende rock is a kind of super fermite (dark mineral dominant). The real hornblende rocks contain almost no other minerals except common hornblende, they may be alteration products of pyroxene and olivine. Metamorphic amphibolite is the formation of a group of rocks distributed widely and greatly changed by metamorphism. Typically they are medium to coarse-grained, composed of hornblende and plagioclase. They are rocks of amphibolite facies, they may be formed by various types of metamorphic rocks of the former. Mafic igneous rocks (such as basalt and gabbro) and sedimentary dolomite may be amphibolite.

Detailed introduction:
The chemical composition of the common hornblende is (Ca, Na) 2-3 (Mg2+, Fe2+, Fe3+, Al3+) 5[(Al, Si) 4O11] (oH) 2, and the crystal belongs to the double chain structure silicate mineral of the monoclinic system. The crystal is long columnar, and the cross section is a nearly diamond six side body. The aggregate is usually granular, needle like or fibrous. Green black to black streaks, grayish green, shiny glass, almost opaque.
Because the isomorphic displacement relation is complex, its components are not very fixed. This complexity is mainly manifested in the ratio change of Ca/Na, Mg/Fe, Al/Fe3+, Al/Si and OH/F.
Two groups of cylindrical cleavage completely, angle of 124 degrees or 56 degrees.
Mohs hardness of 5-6, the proportion of 3.13.4.
Ordinary hornblende is the main rock forming mineral of igneous and metamorphic rocks. Hornblende can cast stone in raw material ingredients. The most common mineral of the hornblende.
Often Chengzhu crystal morphology. The cross section is a false hexagon. The double crystal is in contact with (100). It is often a fine columnar and fibrous aggregate.
Hornblende (hornblende) is from the German language. It is originally a miner term. Horn may refer to the color of the horn, and blende means deceiver. This mineral is black and luminous. It belongs to metal ores, but can not contain valuable metals.

Cause of origin:
It is closely related to magmatism and is the main constituent mineral of various intermediate and acid intrusive rocks.
The common hornblende variants rich in Fe2O3 and TiO2 are known as basaltic hornblende in basic extrusive rocks.
Regular hornblende sometimes forms a false image according to pyroxene, which is called false fibrin.
In the regional metamorphism in the product, is the main part of amphibolite, amphibolite schist, gneiss, amphibolite.

Characteristic properties:
The cleavage of the common hornblende
The crystal is long columnar, and the cross section is a nearly diamond six side body. The aggregate is usually granular, needle like or fibrous.
Green black to black streaks, grayish green, shiny glass, almost opaque.
Two groups of cylindrical cleavage completely, angle of 124 degrees or 56 degrees.
Mohs hardness of 5-6, the proportion of 3.13.4.

Physical property
Dark green to dark green; streak colorless or white glass luster.
Cleavage (110) is complete. The cleavage angle of the two groups is 124 degrees or 56 degrees. Sometimes, (100) cracking is caused by the influence of wafer twinning.
The hardness of 5-6. The relative density of 3.13.3.

crystal structure
Crystal structure is monoclinic system; -C2/m; a0=0.979nm, b0=1.790nm, c0=0.528nm; beta =105 degree 31 '; Z=2. Crystal system and space group: monoclinic system, C2/m, cell parameters: a0=0.99nm, b0=1.80nm, c0=0.53nm;
Monoclinic system; C2/m; a0=0.979nm, b0=1.790nm, c0=0.528nm; beta =105 degree 31 '; Z=2.
Crystal system and space group: monoclinic system, C2/m;
The cell parameters are a0=0.99nm, b0=1.80nm and c0=0.53nm.

Distribution of origin:
Ordinary hornblende is one of the widely distributed rock forming minerals. In igneous rocks, especially neutral rocks are the most common and the most dominant dark minerals. In regional metamorphism, ordinary amphibole also has a large number of output.
Common amphibolite usually occurs in metamorphic and igneous rocks, and is one of the most widely distributed rocks. The metamorphic rocks with a large number of common hornblende are called amphibolite.
Ordinary hornblende is an important mineral component of neutral and intermediate acid intrusive rocks and extrusive rocks, and is also a common mineral in metamorphic rocks.

Place of Origin
The main origins are: California, Arizona, Idaho, Pennsylvania; Canada; Scotland, England; Korea; Japan; Australia; New Zealand.

Use:
Hornblende can cast stone raw material ingredients.

Industrial use:
The textile industry, cement industry, asbestos paper, filtering agent, bakelite and insulation material etc..

Research ：
The chemical composition of the common hornblende and magnetite in the surface sediments of the eastern South China Sea is studied by electron probe test and crystal chemical genetic classification diagram. The results show that the chemical composition of the common hornblende and magnetite in the eastern South China Sea is studied.
The common hornblende belongs to the calcareous amphibole group. The main types are magnesium hornblende, calcite amphibole, magnesium calcite calcite, light amphibole hornblende, and ferric amphibole, which are both medium and acidic magma.
The genetic properties of common amphibole and magnetite are consistent with their coexisting mineral characteristics and the regional geological background of the study area.