Add to ORKGThis site is a lecture by Dr. Stephen Nelson from Tulane University that discusses the various nonstandard forms of crystal growth that are characteristic to some minerals. Topics include twinning (contact and penetration, polysynthetic and cyclical), the origins of twinning, and twin laws in the triclinic, monoclinic, orthorhombic, tetragonal, hexagonal, and isometric systems. Various types of polymorphism in many minerals are discussed as well as polytypism, metamict minerals, mineraloids, and pseudomorphism. Examples of each mechanism in common minerals are given. Educational levels: Undergraduate lower division, Undergraduate upper division
Vurroite, ideally Pb20Sn2(Bi,As)22S54Cl6, is a complex mineral type, where the two minor chemical co...
In this article we will examine the main pseudomorph formation pathways and some significant example...
This site from Tulane University consists of a lecture by Dr. Stephen Nelson on tectosilicate, oxide...
The articles published in this Special Issue reprint offer a sound update of research fields where t...
Herpin Paulette. Polymorphism and polytypism in crystals, par A. R. Verma et P. Krishna, 1966. In: B...
Herpin Paulette. Polymorphism and polytypism in crystals, par A. R. Verma et P. Krishna, 1966. In: B...
Twin-structures in microcline specimens from granite pegmatites were studied by polarized light micr...
AbstractPolytypism occupies a singular position in the structural crystallography uniting features o...
Much of the business of science is involved in developing and improving the properties of materials,...
Abstract. This article is the text of the lecture presented for the XXVlI JEEP in Montpellier. Polym...
A number of polytypes, existing over short intervals of structure, have been observed in en-statites...
AbstractPolytypism occupies a singular position in the structural crystallography uniting features o...
This site is a lecture from Tulane University that explores the symmetry observed in crystals. Topic...
This set of lecture notes covers factors affecting the mineral assemblages in metamorphic rocks. Top...
Type IV twins are defined and shown to exist in triclinic crystal systems, as well as in some monocl...
Vurroite, ideally Pb20Sn2(Bi,As)22S54Cl6, is a complex mineral type, where the two minor chemical co...
In this article we will examine the main pseudomorph formation pathways and some significant example...
This site from Tulane University consists of a lecture by Dr. Stephen Nelson on tectosilicate, oxide...
The articles published in this Special Issue reprint offer a sound update of research fields where t...
Herpin Paulette. Polymorphism and polytypism in crystals, par A. R. Verma et P. Krishna, 1966. In: B...
Herpin Paulette. Polymorphism and polytypism in crystals, par A. R. Verma et P. Krishna, 1966. In: B...
Twin-structures in microcline specimens from granite pegmatites were studied by polarized light micr...
AbstractPolytypism occupies a singular position in the structural crystallography uniting features o...
Much of the business of science is involved in developing and improving the properties of materials,...
Abstract. This article is the text of the lecture presented for the XXVlI JEEP in Montpellier. Polym...
A number of polytypes, existing over short intervals of structure, have been observed in en-statites...
AbstractPolytypism occupies a singular position in the structural crystallography uniting features o...
This site is a lecture from Tulane University that explores the symmetry observed in crystals. Topic...
This set of lecture notes covers factors affecting the mineral assemblages in metamorphic rocks. Top...
Type IV twins are defined and shown to exist in triclinic crystal systems, as well as in some monocl...
Vurroite, ideally Pb20Sn2(Bi,As)22S54Cl6, is a complex mineral type, where the two minor chemical co...
In this article we will examine the main pseudomorph formation pathways and some significant example...
This site from Tulane University consists of a lecture by Dr. Stephen Nelson on tectosilicate, oxide...