| 单词 |
pennantite |
| 释义 |
pennantite Min.|ˈpɛnəntaɪt|
[f. the name of Thomas Pennant (1726–98), Welsh zoologist and mineralogist + -ite1.]
A basic aluminosilicate of manganese, approximately Mn9Al6Si5O20(OH)16, most specimens of which are pleochroic and orange in thin section.
1946W. C. Smith et al. in Mineral. Mag. XXVII. 217 (heading) Pennantite, a new manganese-rich chlorite from Benallt mine, Rhiw, Carnarvonshire. Ibid. 220 The names manganchlorite (Hamberg) and manganese-chlorite (Eckermann) have been applied to chlorites containing only a low percentage (1· 02–2·28) 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. 1954Ibid. XXX. 280 The manganese-bearing chlorites include the remarkable species pennantite, chemically a klementite with the magnesium almost wholly replaced by manganese. 1970Mineral Abstr. XXI. 249/2 (heading) The ferruginous and magnesium varieties of pennantite from the Atasui deposits in Central Kazakhstan. Ibid., Fepennantite occurs in the Ushatan 1 deposit in veinlets with pyrosmalite and calcite. It is dark green. Ibid., Magnesium pennantite in the Zhumast deposit occurs in marbles and in carbonate layers in braunite ore... Pleochroism α orange pink, γ light orange. |
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