Repeated twinning
Twinning Twin"ning, n. (Crystallog.) The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about. [1913 Webster]

{Polysynthetic twinning}, repeated twinning of crystal lamell[ae], as that of the triclinic feldspars.

{Repeated twinning}, twinning of more than two crystals, or parts of crystals.

{Twinning axis}, {Twinning plane}. See the Note under {Twin}, n. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • repeated twinning — noun : twinning in which more than two simple crystals are involved …   Useful english dictionary

  • Twinning — Twin ning, n. (Crystallog.) The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by… …   The Collaborative International Dictionary of English

  • Twinning axis — Twinning Twin ning, n. (Crystallog.) The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for… …   The Collaborative International Dictionary of English

  • Twinning plane — Twinning Twin ning, n. (Crystallog.) The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for… …   The Collaborative International Dictionary of English

  • Polysynthetic twinning — Twinning Twin ning, n. (Crystallog.) The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for… …   The Collaborative International Dictionary of English

  • Polysynthetic twinning — Polysynthetic Pol y*syn*thet ic (p[o^]l [i^]*s[i^]n*th[e^]t [i^]k), a. [Poly + synthetic.] Characterized by polysynthesis; agglutinative. [1913 Webster] {Polysynthetic twinning} (Min.), repeated twinning, like that of the triclinic feldspar,… …   The Collaborative International Dictionary of English

  • Crystal twinning — Diagram of twinned crystals of Albite. On the more perfect cleavage, which is parallel to the basal plane (P), is a system of fine striations, parallel to the second cleavage (M). Crystal twinning occurs when two separate crystals share some of… …   Wikipedia

  • multiple birth — Birth of more than one child from one pregnancy. Twins are most common, born in 1 of about every 80 pregnancies. Identical twins develop from a single fertilized egg, which splits into two genetically identical embryos (though physical traits may …   Universalium

  • Bournonite — is a sulfosalt mineral species, a sulfantimonite of lead and copper with the formula PbCuSbS3. It was first mentioned by Philip Rashleigh in 1797 as an ore of antimony, and was more completely described by the comte de Bournon in 1804, after whom …   Wikipedia

  • Polysynthetic — Pol y*syn*thet ic (p[o^]l [i^]*s[i^]n*th[e^]t [i^]k), a. [Poly + synthetic.] Characterized by polysynthesis; agglutinative. [1913 Webster] {Polysynthetic twinning} (Min.), repeated twinning, like that of the triclinic feldspar, producing fine… …   The Collaborative International Dictionary of English

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