{Polysynthetic twinning} (Min.), repeated twinning, like that of the triclinic feldspar, producing fine parallel bands in alternately reversed positions. [1913 Webster]
The Collaborative International Dictionary of English. 2000.
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 — 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
