nordmarkite
(ˈnɔːdmɑːkaɪt)
[f. Nordmark, name of an area in Sweden + -ite1.]
1. Min. A brown manganesian variety of staurolite.
| 1868 J. D. Dana Syst. Min. (ed. 5) v. 389 Manganese-Staurolite, Nordmarkite (anal. 28); from dolomite in Nordmark, Sweden, of chocolate-brown color, with H. = 6·5, G. = 3·54, and presenting the usual crystalline form. Its easy fusibility is reason for here giving this variety the distinctive name Nordmarkite. 1968 I. Kostov Mineralogy 289 Staurolites rich in manganese are termed nordmarkite. |
2. Petrogr. [a. G. nordmarkit (W. C. Br{obar}gger 1890, in Zeitschr. f. Kryst. und Mineral. XVI. i. 55).] A syenite composed mainly of microperthite, with lesser amounts of quartz and usu. oligoclase and biotite, which has a trachytoid or granitic texture.
| 1895 Mineral. Mag. XI. 115 The corresponding abyssal or plutonic rock is nordmarkite. 1928 Mineral. Abstr. III. 498 The differentiation of the Lung Wang Miao åkerite has given rise to a whole series of granitic derivatives: nordmarkite, alkali-granite-aplite, and quartz-porphyry. 1942 Amer. Jrnl. Sci. CCXL. 362 Nordmarkite porphyry from a dyke at Blindern, by Oslo, Norway. 1970 Meddelelser om Gr{obar}nland CXC. ii. 15 The nordmarkites are grey or fawn in colour and are fairly coarse-grained rocks. Ibid. 16 In most of the nordmarkites the ferromagnesian minerals occur in small clusters. |
Hence nordmarˈkitic a., composed of, or having the nature of, (the rock) nordmarkite.
| 1947 Mineral. Mag. X. 90 At Dorowa [S. Rhodesia] nordmarkitic granite occurs with syenite in the outer ring. 1953 Q. Jrnl. Geol. Soc. CIX. 161 Keratophyres, kersantites and nordmarkitic rocks occur on both sides of the outcrop of the Moine thrust-plane. |