pennantiten.
/ˈpɛnəntʌɪt/, U.S. /ˈpɛnənˌtaɪt/ Mineralogy.
A mineral of the monoclinic crystal system which consists of a hydroxide and aluminosilicate of manganese, and occurs as minute orange-red pleochroic flakes.
ΘΚΠ
the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > other tektosilicates
sarcolite1814
allophane1817
gmelinite1825
levyne1825
schrötterite1844
levynite1868
maskelynite1875
steatoid1877
griqualandite1887
tiger-eye1891
pennantite1946
tacharanite1961
1946 W. C. Smith et al. in Mineral. Mag. 27 217 (heading) Pennantite, a new manganese-rich chlorite from Benallt mine, Rhiw, Carnarvonshire.
1946 W. C. Smith et al. in Mineral. Mag. 27 220 The names manganchlorite (Hamberg) and manganese-chlorite (Eckermann) have been applied to chlorites containing only a low percentage..MnO, so it is desirable to avoid the use of either of these names for a chlorite so rich in manganese as the mineral here described, and we therefore propose for it a new name, pennantite.
1954 Mineral. Mag. 30 280 The manganese-bearing chlorites include the remarkable species pennantite, chemically a klementite with the magnesium almost wholly replaced by manganese.
1970 Mineral Abstr. 21 249/2 Magnesium pennantite in the Zhumast deposit occurs in marbles and in carbonate layers in braunite ore.
1997 Proc. National Acad. Sci. U.S.A. 94 12266/2 Birnessite..and pennantite (not shown) contain sheets, rather than chains, of octahedrally coordinated Mn.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).
<
n.1946