Triclinic mineral system

There are six mineral systems Isometric, Hexagonal, Tetragonal, Orthorhombic, Monoclinic, and Triclinic. The Trigonal... [Pg.17]

Formula Chemical class Chemical type NaCa3(U02)(C03)j(S04)F lOH O Compound carbonate Miscellaneous Crystal system Triclinic Mineral group Space group PI... [Pg.193]

Six types of spectra are theoretically possible in minerals of the orthorhombic, monoclinic and triclinic systems (McClure, 1959). However, for electric dipole transitions only three spectra are usually distinguished. These are the a, P and y spectra obtained when light is polarized along each of the three indicatrix axes, which in orthorhombic minerals such as olivine and orthopyroxene correspond to the three crystallographic axes. The majority of the spectra of minerals described in chapters 4 and 5 consist of polarized spectra measured in the three mutually perpendicular directions corresponding to a, P and y polarized light... [Pg.75]

Crystals of ferrous manganese metasilicate (Fe, Mn)Si03, or iron rhodonite, have been obtained from Bessemer slags. They belong to the triclinic system, and closely resemble crystals of the mineral.2... [Pg.240]

CaC03 occurs in three forms the most abundant is calcite (mineral constituent of limestone) crystallizing in the triclinic system and having a density of 2.71 g/cm. ... [Pg.26]

The three sillimanite minerals are structurally similar and have structures that are related to that of mullite. It is not surprising that they all form mullite upon decomposition. Kyanite crystallizes in the triclinic system, while sillimanite, andalusite, as well as mullite have orthorhombic crystal structures. In these structures, all the Si4+ cations are in fourfold coordination with 02 anions, but the Al3+ cations exist in four-, five-, and sixfold coordination with 02 anions, and therein lie the structural differences. The fivefold coordination of some Al3+ cations within A105 polyhedra is rather unusual, perhaps the result of formation at high pressures. The other structural differences among the three minerals are quite small. They are associated with the double chain structures of these three minerals and the linkages of the chains to one another by different alumina and silica polyhedra. Those concepts are readily extended to mullite. [Pg.43]

Formula Chemical class Chemical type Na7AlH2(C03)4F4 Crystal system Acid carbonate Mineral group Space group Triclinic, pseudohexagonal... [Pg.34]

Formula Chemical class Chemical type (Cu,Co),(C03)(OH), Anhydrous carbonate with hydroxyl or halogen (AB),(X03>Z, Crystal system Mineral group Space group Triclinic Malachite PI or Pi... [Pg.124]

Formula Chemical class Chemical type Zn,2Ca(U02)(C03)3(0H)22 4H20 Crystal system Hydrated carbonate with hydroxyl or halogen Mineral group Miscellaneous Space group Triclinic PI... [Pg.240]

Following Smith and Yoder [1956], Zvyagin [1967] has proposed symbols to represent the numbers of layers and symmetry of the kaolin group minerals. In the system proposed by Smith and Yoder, kaolin that contains one layer in a triclinic unit cell is symbolized as IT, and dickite that contains two layers in a monoclinic cell is symbolized as 2M. Bailey [1963], recognizing that the ordering of cations or the vacant octahedral position in the dioctahedral minerals changes the size, shape, and symmetry of the unit cell, has modified the Smith and Yoder system to indicate in one double symbol the basic crystallographic form and its ordered modification. [Pg.152]

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