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 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:

  • 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

  • polysynthetic twinning — noun A type of contact twins where the composition surfaces are parallel to one another …   Wiktionary

  • 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

  • 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

  • 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… …   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

  • feldspar — /feld spahr , fel /, n. any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks. Also, felspar.… …   Universalium

  • Spurrite — Infobox mineral name = Spurrite category = Silicate/carbonate mineral boxwidth = boxbgcolor = caption = Spurrite from New mexico formula = Ca5(SiO4)2CO3 molweight = color = Gray, gray white to lilac gray habit = Massive to granular system =… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”