hemitropeadj.n.

/ˈhɛmɪtrəʊp/

Etymology: < French hémitrope (1801 Haüy), < hemi- prefix + Greek -τροπος turning.

Crystallography.

A. adj.

= hemitropic adj.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [adjective] > hemitropic

hemitrope1816

hemitropic1886

1816 R. Jameson Treat. External Characters Minerals (ed. 2) 220 Hemitrope,..that is, one-half turned round, when it [i.e. a crystal] is composed of two halves of one and the same crystal, of which the one-half appears to be turned upon the other one-half of the circumference. Example, Twin-crystal of felspar.

1823 H. J. Brooke Familiar Introd. Crystallogr. 89 A hemitrope crystal..resembling one of the varieties of the common spinelle.

1895 N. Story-Maskelyne Crystallogr. §159 In the hemitrope position..one pair of the faces forms a re-entrant angle.

B. n.

A hemitropic crystal.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemitrope

hemitrope1816

1816 R. Jameson Treat. External Characters Minerals (ed. 2) 171 Hauy has given to these reversed crystals the name hemi-tropes, denoting one half reversed.

1895 N. Story-Maskelyne Crystallogr. §157 Repetition of the twinning on similar twin-faces may indeed occur..Such crystals are triple, quadruple, &c. hemitropes (or triplings, fourlings, &c.).

Derivatives

ˈhemitropism n.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemitrope > hemitropism

hemitropisma1830

hemitropy1879

a1830 Encycl. Metrop. (1845) IV. 578 A variety of cases of hemitropism.

heˈmitropy n. hemitropic crystallization.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemitrope > hemitropism

hemitropisma1830

hemitropy1879

1879 F. Rutley Study of Rocks x. 92 Due to hemitropy or a half revolution of one of the halves of the crystal.

1895 N. Story-Maskelyne Crystallogr. §163 It results from the law of hemitropy that each pair of corresponding faces on the two crystals lies in one zone with the twin-plane and that the faces make equal angles with it.

This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2018).

单词	hemitrope
释义	hemitropeadj.n. /ˈhɛmɪtrəʊp/ Etymology: < French hémitrope (1801 Haüy), < hemi- prefix + Greek -τροπος turning. Crystallography. A. adj. = hemitropic adj. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [adjective] > hemitropic hemitrope1816 hemitropic1886 1816 R. Jameson Treat. External Characters Minerals (ed. 2) 220 Hemitrope,..that is, one-half turned round, when it [i.e. a crystal] is composed of two halves of one and the same crystal, of which the one-half appears to be turned upon the other one-half of the circumference. Example, Twin-crystal of felspar. 1823 H. J. Brooke Familiar Introd. Crystallogr. 89 A hemitrope crystal..resembling one of the varieties of the common spinelle. 1895 N. Story-Maskelyne Crystallogr. §159 In the hemitrope position..one pair of the faces forms a re-entrant angle. B. n. A hemitropic crystal. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemitrope hemitrope1816 1816 R. Jameson Treat. External Characters Minerals (ed. 2) 171 Hauy has given to these reversed crystals the name hemi-tropes, denoting one half reversed. 1895 N. Story-Maskelyne Crystallogr. §157 Repetition of the twinning on similar twin-faces may indeed occur..Such crystals are triple, quadruple, &c. hemitropes (or triplings, fourlings, &c.). Derivatives ˈhemitropism n. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemitrope > hemitropism hemitropisma1830 hemitropy1879 a1830 Encycl. Metrop. (1845) IV. 578 A variety of cases of hemitropism. heˈmitropy n. hemitropic crystallization. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemitrope > hemitropism hemitropisma1830 hemitropy1879 1879 F. Rutley Study of Rocks x. 92 Due to hemitropy or a half revolution of one of the halves of the crystal. 1895 N. Story-Maskelyne Crystallogr. §163 It results from the law of hemitropy that each pair of corresponding faces on the two crystals lies in one zone with the twin-plane and that the faces make equal angles with it. This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2018). < adj.n.1816
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