paragenesisn.

1853 Edinb. New Philos. Jrnl. 54 324 By the paragenesis of minerals he [sc. Breithaupt] understands the more or less definite mode of association, by means of which he endeavours to determine their relative age.

1871 J. H. Collins Handbk. Mineral. Cornwall & Devon 71 A more strict paragenesis would deal with those groups of minerals which are immediately associated with each other.

1894 Thinker 5 342 By paragenesis, or by some form of pseudomorphism, one mineral may be changed into another.

1934 Q. Jrnl. Geol. Soc. 90 338 Sillimanite has been abundantly developed alongside some quartz veins... This paragenesis forms a selvedge between quartz veins and the biotite-muscovite-schist.

1954 R. L. Parker tr. P. Niggli Rocks & Mineral Deposits iv. 128 Another method..consists in constructing theoretical (so-called normative) mineral associations..to constitute idealized parageneses under certain physical-chemical conditions.

1974 Nature 22 Nov. 336/1 The mineral parageneses of alkali pegmatites are not considered in detail.

1989 Jrnl. Petrol. 30 62 Cores of cordierites poikilitically enclosing biotite and lesser garnet, together with those inclusions, comprise part of a paragenesis in these rocks distinct from that defined by other matrix grains.

1861 Proc. Royal Soc. 11 51 Algæ and animals of every kind were arranged according to their vertical and horizontal distribution, and their natural groups and paragenesis were deduced from the above-mentioned physico-marine observations.

1986 Cultural Anthropol. 1 158 In a ‘hard science’ like geology, the coevolution of paired substances—called paragenesis—is a common object of precise study. In human history, the paragenesis of expressive form with adaptive behavior is no less real and no less common.

1890 Cent. Dict. 4276/1 Paragenesis, in biol., the origination, in an individual of a given species, of characters due to or in part derived from another species, as in hybridization; hybridism, with reference to the congenital peculiarities of the resulting offspring.

1891 Nature 17 Sept. 484 Paragenesis will include the following modes [of rejuvenescence], usually grouped under the term parthenogenesis, apogamy (pro parte), &c.:—A. True Parthenogenesis... B. Simulated Parthenogenesis... C. Metagametal Rejuvenescence... D. Paragamy or Endokaryogamy: vegetative or gametal nuclei lying in a continuous mass of cytoplasm fuse to form a zygote nucleus.